- Nano Express
- Open Access
Synthesis of Au/CdSe Janus Nanoparticles with Efficient Charge Transfer for Improving Photocatalytic Hydrogen Generation
Nanoscale Research Letters volume 14, Article number: 349 (2019)
Metal-semiconductor heterostructures integrate multiply functionalities beyond those of their individual counterparts. Great efforts have been devoted to synthesize heterostructures with controlled morphologies for the applications ranging from photocatalysis to photonic nanodevices. Beyond the morphologies, the interface between two counterparts also significantly influences the performance of the heterostructures. Here, we synthesize Au/CdSe Janus nanostructures consisting of two half spheres of Au and CdSe separated by a flat and high-quality interface. Au/CdSe with other morphologies could also be prepared by adjusting the overgrowth conditions. The photocatalytic hydrogen generation of the Au/CdSe Janus nanospheres is measured to be 3.9 times higher than that of the controlled samples with CdSe half-shells overgrown on the Au nanospheres. The highly efficient charge transfer across the interface between Au and CdSe contributes to the improved photocatalytic performance. Our studies may find the applications in the design of heterostructures with highly efficient photocatalytic activity.
Metal-semiconductor colloidal heterostructures have attracted extensive interests due to their extraordinary optical behaviors and functionalities far beyond those of their individual counterparts and have exhibited great potential in solar energy conversion [1, 2], photocatalysis [3,4,5,6,7,8], photoelectric devices [9,10,11], and photothermal therapy [12,13,14,15], etc. Especially, plasmon-based hybrid nanostructures become a promising candidate for photocatalytic water splitting or hydrogen generation with excellent photocatalytic performance [16,17,18,19]. Colloidal nanoparticles of metal chalcogenide semiconductors (sulfide, selenide, and telluride) have received significant attention in photocatalytic application due to their suitable and tunable band gap matched with solar spectrum as well as their chemical properties. However, the low absorption efficiency in visible light region and the quick recombination of photo-induced charge carriers have limit the application of pure semiconductor nanoparticles. To overcome these issues, many efforts have been devoted to integrate plasmonic metal nanocrystals (nanospheres , nanorods , nanoplates , etc.) and chalcogenide semiconductors (CdX [23,24,25,26,27,28], Ag2X [29,30,31,32,33], Cu2X [12,13,14,15], PbX  etc. (X = S, Se, Te)) to build hybrid nanostructures with intriguing properties.
As for the plasmon-enhanced photocatalytic performance, many possible mechanisms have been discussed in previous works, including effectively harvesting light energy through surface plasmon resonances, concentrating local electromagnetic field in adjacent semiconductors, promoting photoexcited charge generation and transfer, suppressing electron-hole recombination and plasmon-induced hot-electron transfer from metals to semiconductors [35,36,37,38,39]. Besides that, several structural factors such as morphology, size, hybrid configuration, and contact interface have been reported to be crucial for photocatalytic activity [40,41,42,43]. Zhao et al. have finely tuned the structural symmetry of the Au/CdX (X = S, Se, Te) hybrid nanoparticles with controllable spatial distribution between the two components by a non-epitaxial synthetic route and demonstrated the dependence of photocatalysis on the structural symmetry . The interfacial charge transfer and the exposure of active materials to reaction solution are the important factors for determining the performance of heterodimer type and core-shell-type hybrids [41, 44]. The possibility of charge transfer between the metal and the chalcogenide semiconductors has been exhibited in several types of hybrids [41, 44,45,46]. Additionally, the charge transfer also depends significantly on the interfacial conditions, such as interfacial energy and quality between the two counterparts [41, 44]. There remain great challenges to obtain a good heterogeneous interface for metal-semiconductor hybrid nanostructures due to the large lattice mismatch between two components. Therefore, it is meaningful to finely tailor the interface and contact to achieve the tunable properties and electronic mobility in the metal-semiconductor hybrid nanostructures.
In this paper, we report a particular approach to synthesize water-dispersed asymmetric Au/CdSe Janus heterostructures with a flat and high-quality interface between Au and CdSe. By manipulating the pH value of the reaction solution, CdSe with different morphologies and coverages are grown on the Au nanoparticles. The results show the pH value is crucial for the formation of Janus morphology with the flat and high-quality interface. Hydrogen generation measurements show that the Janus Au/CdSe heterostructures has a significantly higher efficiency than those of the other types of hybrid structures due to the low interface energy and the improved electron transfer efficiency on the interface of Au and CdSe.
Chloroauric acid (HAuCl4·4H2O, 99.99%), silver nitrate (AgNO3, 99.8%), glycine acid (99.5%), selenium powder (Se, 99.5%), L-ascorbic acid (99.7%), sodium hydrate (NaOH, 96.0%), cadmium nitrate tetrahydrate (Cd(NO3)2·4H2O, 99.0%), hydrochloric acid (HCl, 36–38%), hexamethylenetetramine (HMT, 99.0%), and sodium borohydride (NaBH4, 96%) were all purchased from Sinopharm Chemical Reagent Co. Ltd. (Shanghai, China). Cetyltrimethylammonium-bromide (CTAB, 99.0%) was obtained from Amresco, Inc. (America). All chemicals were used as received and without further purification.
Synthesis of Au Nanoparticles
The CTAB-stabilized Au nanoparticles were synthesized at room temperature by a seed-mediated growth method reported previously . Firstly, 4.5 mL aqueous solution was prepared by mixing 500 μL of 5 mM HAuCl4 and 5 mL of 0.2 mM CTAB, and then 600 μL of 10 mM ice-cooled NaBH4 solution was added. The brownish solution of Au seeds was left undisturbed for 2 h for further use. Next, 120 μL Au seed solution was added into a aqueous mixture including 190 mL of H2O, 4 mL of 10 mM HAuCl4, 9.75 mL of 0.1 M CTAB, and 15 mL of 100 mM ascorbic acid. The solution was well mixed by a slight shaking and then was allowed to stand overnight for the growth of Au nanoparticles.
Synthesis of Au-Ag Bimetallic Nanoparticles
Firstly, the pH value of a aqueous mixture including 5.0 mL of the Au nanoparticles (8.0 nM) and 5.0 mL of 200 mM glycine acid was respectively adjusted to 2.5, 4.5, 7.2 or 8.1 by the dropwise addition of HCl solution (VHCl:VH2O = 1:9) or NaOH solution (2 M). The mixture was kept at 30 °C under stirring for 1 min. Then, 15 µL of 100 mM AgNO3 solution was injected. The mixture was kept at 30 °C without stirring for 10 h. The products of Au-Ag bimetallic nanoparticles were directly used for the growth of Au-CdSe hybrid nanoparticles.
Synthesis of Au/CdSe Janus Heterostructures
The Au/CdSe Janus heterostructures was prepared by mixing 2 mL of the as-prepared Au-Ag nanoparticles, 6 mg of selenium powder, 0.01 mL of 100 mM Cd(NO3)2 solution, and 40 µL of 10 mM NaBH4 solution. The mixed reaction was vigorously stirred at 90 °C for 2 h. The products were centrifuged at 9500 rpm for 5 min and washed by water twice. The controlled samples with other morphologies were prepared by the same procedure except for the pH value of the growth of Au-Ag nanoparticles.
Evaluation of Photocatalytic Activities
The visible light photocatalytic hydrogen evolution tests were carried out in a quartz tube reactor with a rubber diaphragm. One hundred milligrams of Au/CdSe photocatalyst powder was dispersed in 50 mL of an aqueous solution containing 5 mL of lactic acid as a sacrificial agent in a quartz tube reactor. The reactor was pumped off with stirring for 30 min to remove any dissolved air. The light source is a 300-W xenon lamp with an ultraviolet cutoff filter (λ > 420 nm). During the entire photocatalytic test, the temperature of the suspension was maintained at 6 °C with an external water-cooling system to withstand the temperature rise of the optical radiation. The content of hydrogen was automatically analyzed by on-line gas chromatography (Tianmei GC-7806).
TEM studies were done with a JEOL 2010 HT microscope operated at 200 kV by drop casting the sample dispersions on carbon-coated copper grids. HRTEM, TEM, and EDX analyses were performed using a JEOL 2010 FET microscope operated at 200 kV accelerating voltage. The UV-Vis spectra were recorded with a TU-1810 (Purkinje General Instrument Co. Ltd. Beijing, China) and Cary 5000 (Agilent) spectrometer. All optical measurements were performed at room temperature under ambient conditions.
Results and Discussion
Figure 1 schematically describes the synthesis of water-dispersed Au/CdSe Janus nanospheres. Firstly, CTAB-stabilized Au nanoparticles were prepared by a seed-mediated growth method . Then a small amount of Ag was deposited on the Au nanoparticles with controlled pH value of the reaction solution, and finally the uncentrifuged solution of Au-Ag nanoparticles was put into a reaction including selenization, cation exchange with Cd2+, and overgrowth of CdSe.
The growth processes of Au/CdSe Janus nanospheres are very similar to that of the mike-like Au-AgCdSe nanorods we previous reported . In a typical process, the synthesis of Au/CdSe Janus nanospheres can be divided into three steps: Ag wetting layers deposition, Ag selenization, and CdSe selective growth. In the first step, Au-Ag bimetallic spherical nanoparticles were synthesized by consecutively adding glycine, HCl, and AgNO3 to an aqueous dispersion of CTAB-stabilized Au nanoparticles at 30 °C. Ag was deposited onto the CTAB-stabilized Au nanospheres by reducing AgNO3 with glycine acid at the pH value of 2.5 adjusted by adding appropriate HCl. The corresponding thicknesses of Ag layer can be tailored by adjusting of glycine reduction capacity with pH value. In addition, the Ag deposition possibly produces an AuAg alloyed layer rather than a pure Ag layer on the surface of Au nanoparticles due to the atom diffusion . The produced Au-Ag bimetallic nanoparticles are supposed to be very important for the formation of Au/CdSe Janus nanospheres with a flat interface. Next is the selenization of Ag layers. This step is performed by sequentially adding Se powder, Cd(NO3)2, and NaBH4 into the uncentrifuged solution of Au-Ag nanospheres at 90 °C with stirring for 2 h. The Ag layer could be selenized spontaneously by Se powder. As the atom diffusion leads to the forming of AuAg alloyed layer coating on the Au nanoparticles, partial Au could also be selenized. This process would lead to an etching effect of Au. Once formed, Ag2Se will be acted as the “anchor point” for overgrowth of CdSe. The last step is the formation of Au/CdSe Janus nanospheres. Ag2Se ripening, cation exchange with Cd2+, and epitaxial growth of CdSe are supposed to be involved in the formation of Au/CdSe Janus nanospheres. Here, it should be noted that the solution remains acidic with pH = 2.5. The relative high concentration of Se0 and the low concentration of Se2-, because of the inhibited reducibility of the reducing agent in this condition, would induce a relatively fast ripening process of Ag2Se and slow overgrowth of CdSe. Meanwhile, the conductive metal nanosphere can further offer an effective pathway for electron transfer in Ag2Se ripening process, which will eventually lead to a hemispherical nanoshell. The subsequent cation exchange with Cd2+ ions produces a CdSe layer, which facilitates the overgrowth of CdSe on these sites, overcoming the barrier of crystal lattice mismatch. The obtained Au/CdSe Janus nanospheres composed of two hemispheres are clearly observed in Fig. 2a. In addition, since Ag layers are very thin at pH = 2.5, it can be imagined that the selenization of the Ag layer and the ripening of Ag2Se are a short process. Then, it is inevitable that Se0 will continue to etch the AuAg alloyed interface. The metal-semiconductor interfaces would further flatten along a certain crystal plane . Meanwhile, the corresponding semiconductor bumps gradually enlarge, as displayed in Fig. 2b. The initial Au nanoparticles have an average diameter of 22 ± 2 nm, as displayed in Fig. 3a. After the coating of CdSe nanocrystals with stirring for 2 h at 90 °C, the thickness of the semiconductor hemispheres is 6 ± 2 nm (Fig. 3b). As the reaction continues for another hour, the size of the semiconductor counterpart is increased by 5 ± 1 nm (Fig. 3c), implying the further large overgrowth of CdSe. Figure 2c shows the HRTEM image of a single Au/CdSe Janus nanosphere. The lattice plane spacings of 0.20 nm and 0.21 nm agree well with the (200) lattice planes of the fcc gold crystal  and the (220) planes of CdSe . The EDX spectrum in Fig. 4 also indicates the composition of Au, Cd, and Se in the Janus nanospheres as well as the residual Ag species.
Due to the lattice mismatch, the hetero interface is strongly influenced by the adhesion of the capping ligand, surfactant, precursor, and solvent in the colloidal phase [50,51,52]. Several issues should be considered to understand the morphology evolution of Au/CdSe hybrid nanoparticles. In the preparation process of Au/CdSe hybrid nanoparticles, the pH value in the first step is a key factor for well controlling the reaction kinetics. When the pH is increased, the reducing power of BH4− is boost up. It will induce the increase of Se2+ ions in the solution and promote the rapid formation of CdSe. As such, it is reasonable to assume that once the formation rate of CdSe exceeds the ripening rate of Ag2Se, more options will be provided for the selective growth of CdSe. In addition, since a higher pH value also makes glycine a stronger reductant in the first step, the reduction of Ag could be boosted up, and the thickness of Ag wetting layers would increase with pH value of the reaction solution. As a result, more Se atoms are allocated to the process of Ag layer selenization and CdSe growth at high pH environment, which will prolong the Ag2Se ripening time and ease the AuAg interfacial etching . Our experiment conducted at different pH environments also confirmed this argument. As shown in Fig. 5, through manipulating the pH value (2.5, 4.5, 7.2, and 8.1, respectively) of the solution while keeping the amount of Cd(NO3)2 constant (0.05 mL and 0.1 M), four different types of Au/CdSe hybrid nanoparticles could be produced, such as Janus nanospheres, heterodimers (consisting of CdSe half-shells overgrown on the Au nanospheres), symmetric double-headed nanoparticles, and multi-headed nanoparticles. The four hybrid nanoparticles show different interfaces between Au and CdSe. Furthermore, as shown in Additional file 1: Figure S1, at low pH value, the slow growth rate of CdSe may also induce the high-degree crystallization and the more obvious anisotropic growth of the semiconductor, which could result in the low interfacial strain energy and grain boundary energy [41, 44].
The Au nanoparticles display a strong SPR band located at about 522 nm. As shown in Fig. 6a, the Ag deposition leads to a blue-shit of plasmon band. As the pH value for Ag deposition is respectively set to 2.5, 4.5, 7.2, and 8.1, the absorption peak of Au-Ag blueshifts respectively to 516 nm, 508 nm, 503 nm, and 500 nm. The high growth rate of Ag at high pH value leads to the thick Ag shell and the large blueshift of plasmon band [53, 54]. Figure 6b shows the extinction spectra of the four types of Au/CdSe hybrid nanoparticles. The growth of CdSe leads to the redshift of plasmon band. As the pH value of Ag deposition is increased, the extinction band is redshifted to 536 nm, 553 nm, 594 nm, and 602 nm, respectively. The large redshift at high pH value is caused by the increased thickness and coverage of CdSe on the Au nanoparticles, and thus the increased effective refractive index environment [32, 45]. The amount of Cd(NO3)2 also influences the dimension of grown CdSe and the plasmon shift. Figure 6c shows that, at the condition of pH value of 2.5, the extinction peak of Au/CdSe Janus nanospheres is gradually redshifted from 536 to 566 nm and 605 nm as the amount of 0.1 M Cd(NO3)2 is increased from 0.05 to 0.1 mL and 0.15 mL. In addition, both in Fig. 6b and c, the extinction bands of Au/CdSe are broadened compared with the SPR characteristics of pure Au nanoparticles, which is possibly caused by the inhomogeneous distribution of CdSe thickness and coverage. Furthermore, the band gap absorption of CdSe at around 1.74 eV may arise as the CdSe is grown thicker. The presence of plasmon-exciton coupling may also contribute to the spectra broadening .
The photocatalytic H2 generation of the four types of Au/CdSe hybrid nanoparticles are evaluated under a visible light illumination (λ > 420 nm) in 50 mL aqueous solution with 5 mL lactic acid as an environmentally friendly sacrificial agent. As shown in Fig. 7, the multi-headed nanoparticles, symmetric double-headed nanoparticles, heterodimers, and Janus nanospheres exhibit a gradually increased photocatalytic activity. The multi-headed Au/CdSe nanoparticles show a very low hydrogen production rate of 0.16 μmol h−1 g−1. Symmetric double-headed nanoparticles and heterodimers show the hydrogen production rates of 21.4 μmol h−1 g−1 and 26.7 μmol h−1 g−1, respectively. More notably, the hydrogen production rate of Au/CdSe Janus nanospheres is 105.2 μmol h−1 g−1, which is 3.94 times that of the heterodimer structures.
The inner charge separation at the interface of the Au/CdSe heterostructure and the charge transfer processes in photocatalytic H2 generation are further discussed and shown in Fig. 8 to understand the mechanism of this enhanced photocatalytic activity. CdSe is a bandgap (Eg = 1.74 eV) semiconductor with a suitable band potential for water splitting . The bottom of the conduction band is located at a potential more negative than the reduction potential of H+ to H2. Au nanocrystals have also been shown to possess the activity for catalytic reaction . On the one hand, the surface plasmon of Au could effectively harvest the light energy and decay to energetic carriers. On the other hand, the plasmon-enhanced local field enhances the light absorption of adjacent CdSe . These effects would improve the generation of photoexcited carriers for the photocatalytic reactions. Then the photoexcited electrons/holes should be separated and migrated to the surface without recombination. Since holes and electrons respectively gain energy by moving up and down, the photoexcited electrons can be transferred from the conduction band (CB) of the CdSe to the Fermi level of Au. The charge transfer across the interface between the CdSe and Au play a critical role for achieving this goal and accelerating the yield of H2 generation [41,42,43,44]. The conditions of interface and contact between the two components determine the charge transfer performance and thus the photocatalytic properties of hybrids. Compared with the multi-head structure, the H2 production efficiency of the single-head structure (heterodimers and Janus nanospheres) is higher. When more CdSe heads are grown onto Au, more Au surfaces acting as the reaction site would be blocked from the reaction solution. Compared with the other three heterostructures, the Au/CdSe Janus nanospheres exhibit a flat interface with high-degree crystallization and low interfacial strain, which could improve the interfacial charge transfer efficiency and suppress the carrier scattering loss. The size of plasmonic nanoparticles, the morphology of the hybrids, the dimension of semiconductor component, and the position of catalytic active sites are all critical for the photocatalytic activity [41, 44]. The optimal dimension of Janus Au/CdSe for the photocatalytic application need to be further investigated.
In summary, we presented a precise synthesis of water-dispersed Au/CdSe Janus nanospheres with controlled interfacial condition and quality. Four types of Au/CdSe hybrids of Janus nanospheres, heterodimers, symmetric double-headed nanoparticles, and multi-headed nanoparticles could be produced by manipulating the pH value. The evaluation of photocatalytic hydrogen generation showed that the Au/CdSe Janus nanospheres exhibit at least 3.9 times higher H2 evolution rate than other Au/CdSe counterparts. The improved photocatalytic performance is owing to the flat and high-quality interface between Au and CdSe, which promotes the charge transfer across the interface and accelerates the interfacial charge separation.
Availability of data and materials
All data generated or analyzed during this study are included in this article and its supplementary information file.
X-ray powder diffraction
Energy-dispersive X-ray spectroscopy
Transmission electron microscopy
High-resolution transmission electron microscope
Wang M, Ye M, Iocozzia J, Lin C, Lin Z (2016) Plasmon-mediated solar energy conversion via photocatalysis in noble metal/semiconductor composites. Advanced Science 3:1600024
Zhuang TT, Liu Y, Li Y, Sun M, Sun ZJ, Du PW, Jiang J, Yu SH (2017) 1D colloidal hetero-nanomaterials with programmed semiconductor morphology and metal location for enhancing solar energy conversion. Small 13:1602629
Chen K, Ding SJ, Luo ZJ, Pan GM, Wang JH, Liu J, Zhou L, Wang QQ (2018) Largely enhanced photocatalytic activity of Au/XS2/Au (X = Re, Mo) antenna-reactor hybrids: charge and energy transfer. Nanoscale 10:4130–4137
Wang L, Liu Z, Han J, Li R, Huang M (2019) Stepwise synthesis of Au@CdS-CdS nanoflowers and their enhanced photocatalytic properties. Nanoscale Res Lett 14:148
Tsai CE, Yeh SM, Chen CH, Lin HN (2019) Flexible photocatalytic paper with Cu2O and Ag nanoparticle-decorated ZnO nanorods for visible light photodegradation of organic dye. Nanoscale Res Lett 14:204
Ma S, Chen K, Qiu YH, Gong LL, Pan GM, Lin YJ, Hao ZH, Zhou L, Wang QQ (2019) Controlled growth of CdS–Cu2 − xS lateral heteroshells on Au nanoparticles with improved photocatalytic activity and photothermal efficiency. J Mater Chem A 7:3408–3414
Haldar KK, Sinha G, Lahtinen J, Patra A (2012) Hybrid colloidal Au-CdSe pentapod heterostructures synthesis and their photocatalytic properties. ACS Appl Mater Interfaces 4:6266–6272
Liu Z, Liu X, Gu X, Guo R, Zhong W (2019) Cu2-xSe Modification onto monoclinic BiVO4 for enhanced photocatalytic activity under visible light. Nanoscale Res Lett 14:95
Atwater HA, Polman A (2010) Plasmonics for improved photovoltaic devices. Nat Mater 9:205–213
Nishijima Y, Ueno K, Yokota Y, Murakoshi K, Misawa H (2010) Plasmon-assisted photocurrent generation from visible to near-infrared wavelength using a Au-Nanorods/TiO2 electrode. The Journal of Physical Chemistry Letters 1:2031–2036
Miao T, Yu D, Xing L, Li D, Jiao L, Ma W, Zhang X (2019) Current rectification in a structure: ReSe2/Au contacts on both sides of ReSe2. Nanoscale Res Lett 14:1
Ji M, Xu M, Zhang W, Yang Z, Huang L, Liu J, Zhang Y, Gu L, Yu YX, Hao WC, An PF, Zheng LR, Zhu HS, Zhang JT (2016) Structurally well-defined Au@Cu2- x S Core-Shell nanocrystals for improved cancer treatment based on enhanced photothermal efficiency. Adv Mater 28:3094–3101
Cao Y, Li S, Chen C, Wang D, Wu T, Dong H, Zhang XJ (2018) Rattle-type Au@Cu2-xS hollow mesoporous nanocrystals with enhanced photothermal efficiency for intracellular oncogenic microRNA detection and chemo-photothermal therapy. Biomaterials 158:23–33
Zhu H, Wang Y, Chen C, Ma M, Zeng J, Li S, Xia YS, Gao MY (2017) Monodisperse dual plasmonic Au@Cu2-xE (E = S, Se) Core@Shell supraparticles: aqueous fabrication, multimodal imaging, and tumor therapy at in vivo level. ACS Nano 11:8273–8281
Chang Y, Cheng Y, Feng Y, Jian H, Wang L, Ma X, Li X, Zhang HY (2018) Resonance energy transfer-promoted photothermal and photodynamic performance of gold-copper sulfide yolk-shell nanoparticles for chemophototherapy of cancer. Nano Lett 18:886–897
Qin L, Wang G, Tan Y (2018) Plasmonic Pt nanoparticles-TiO2 hierarchical nano-architecture as a visible light photocatalyst for water splitting. Sci Rep 8:16198
Wu K, Chen Z, Lv H, Zhu H, Hill CL, Lian T (2014) Hole removal rate limits photodriven H2 generation efficiency in CdS-Pt and CdSe/CdS-Pt semiconductor nanorod-metal tip heterostructures. Am Chem Soc 136:7708–7716
Warren SC, Thimsen E (2012) Plasmonic solar water splitting. Energy Environ Sci 5:5133–5146
Tong H, Ouyang S, Bi Y, Umezawa N, Oshikiri M, Ye J (2012) Nano-photocatalytic materials: possibilities and challenges. Adv Mater 24:229–251
Jana NR, Gearheart L, Murphy CJ (2001) Seeding growth for size control of 5−40 nm diameter gold nanoparticles. Langmuir 17:6782–6786
Khlebtsov BN, Khanadeev VA, Ye J, Sukhorukov GB, Khlebtsov NG (2014) Overgrowth of gold nanorods by using a binary surfactant mixture. Langmuir 30:1696–1703
Leonardo S, Marc CP, Giner-Casares JJ, Judith L, Liz-Marzán LM (2014) Monodisperse gold nanotriangles: size control, large-scale self-assembly, and performance in surface-enhanced Raman scattering. ACS Nano 8:5833–5842
Zhang J, Tang Y, Lee K, Ouyang M (2010) Tailoring light-matter-spin interactions in colloidal hetero-nanostructures. Nature 466:91–95
Zeng J, Huang J, Liu C, Wu CH, Lin Y, Wang X, Zhang SY, Hou JG, Xia YN (2010) Gold-based hybrid nanocrystals through heterogeneous nucleation and growth. Adv Mater 22:1936–1940
AbouZeid KM, Mohamed MB, El-Shall MS (2011) Hybrid Au-CdSe and Ag-CdSe nanoflowers and core-shell nanocrystals via one-pot heterogeneous nucleation and growth. Small 7:3299–3307
Liang S, Liu XL, Yang YZ, Wang YL, Wang JH, Yang ZJ, Wang LB, Jia SF, Yu XF, Zhou L, Wang JB, Zeng J, Wang QQ, Zhang ZY (2012) Symmetric and asymmetric Au-AgCdSe hybrid nanorods. Nano Lett 12:5281–5286
Dutta SK, Mehetor SK, Pradhan N (2015) Metal semiconductor heterostructures for photocatalytic conversion of light energy. The Journal of Physical Chemistry Letters 6:936–944
Saunders AE, Popov I, Banin U (2006) Synthesis of hybrid CdS − Au colloidal nanostructures. J Phys Chem B 110:25421–25429
Sun Z, Yang Z, Zhou J, Yeung MH, Ni W, Wu H, Wang JF (2009) A general approach to the synthesis of gold-metal sulfide core-shell and heterostructures. Angew Chem Int Ed 48:2881–2885
Park G, Lee C, Seo D, Song H (2012) Full-color tuning of surface plasmon resonance by compositional variation of Au@Ag core-shell nanocubes with sulfides. Langmuir 28:9003–9009
Nan F, Liang S, Wang J-H, Liu X-L, Yang D-J, Yu X-F, Zhou L, Hao ZH, Wang QQ (2014) Tunable plasmon enhancement of gold/semiconductor core/shell hetero-nanorods with site-selectively grown shell. Advanced Optical Materials 2:679–686
Liu M, Guyot-Sionnest P (2006) Preparation and optical properties of silver chalcogenide coated gold nanorods. J Mater Chem 16:3942–3945
Ma L, Yang DJ, Luo ZJ, Chen K, Xie Y, Zhou L, Wang QQ (2016) Controlled growth of sulfide on gold nanotriangles with tunable local field distribution and enhanced photocatalytic activity. J Phys Chem C 120:26996–27002
Jiatao Z, Yun T, Kwan L, Min O (2010) Nonepitaxial growth of hybrid core-shell nanostructures with large lattice mismatches. Science 327:1634–1638
Linic S, Christopher P, Ingram DB (2011) Plasmonic-metal nanostructures for efficient conversion of solar to chemical energy. Nat Mater 10:911–921
Hou W, Cronin SB (2013) A review of surface plasmon resonance-enhanced photocatalysis. Adv Funct Mater 23:1612–1619
Ma X, Zhao K, Tang H, Chen Y, Lu C, Liu W, Gao Y, Zhao HJ, Tang ZY (2014) New insight into the role of gold nanoparticles in Au@CdS core-shell nanostructures for hydrogen evolution. Small 10:4664–4670
Clavero C (2014) Plasmon-induced hot-electron generation at nanoparticle/metal-oxide interfaces for photovoltaic and photocatalytic devices. Nat Photonics 8:95–103
Patra BK, Khilari S, Bera A, Mehetor SK, Pradhan D, Pradhan N (2017) Chemically filled and Au-coupled BiSbS3 nanorod heterostructures for photoelectrocatalysis. Chem Mater 29:1116–1126
Ma L, Liang S, Liu XL, Yang DJ, Zhou L, Wang QQ (2015) Synthesis of dumbbell-like gold-metal sulfide core-shell nanorods with largely enhanced transverse plasmon resonance in visible region and efficiently improved photocatalytic activity. Adv Funct Mater 25:898–904
Zhao Q, Ji M, Qian H, Dai B, Weng L, Gui J, Zhang JT, Ouyang M, Zhu HS (2014) Controlling structural symmetry of a hybrid nanostructure and its effect on efficient photocatalytic hydrogen evolution. Adv Mater 26:1387–1392
Wang H, Gao Y, Liu J, Li X, Ji M, Zhang E, Cheng XY, Xu M, Liu JJ, Rong HP, Chen WX, Fan FT, Li C, Zhang JT (2019) Efficient plasmonic Au/CdSe nanodumbbell for photoelectrochemical hydrogen generation beyond visible region. Adv Energy Mater 9:1803889
Costi R, Saunders AE, Elmalem E, Asaf Salant A, Banin U (2008) Visible light-induced charge retention and photocatalysis with hybrid CdSe−Au nanodumbbells. Nano Lett 8:637
Liu J, Feng J, Gui J, Chen T, Xu M, Wang H, Dong HF, Chen HL, Li XW, Wang L, Chen Z, Yang ZZ, Liu JJ, Hao WC, Yao Y, Gu L, Weng YX, Huang Y, Duan XF, Zhang JT, Li YD (2018) Metal@semiconductor core-shell nanocrystals with atomically organized interfaces for efficient hot electron-mediated photocatalysis. Nano Energy 48:44–52
Tisdale WA, Williams KJ, Timp BA, Norris DJ, Aydil ES, Zhu XY (2010) Hot-electron transfer from semiconductor nanocrystals. Science 328:1543–1547
Ma L, Chen K, Nan F, Wang JH, Yang DJ, Zhou L, Wang QQ (2016) Improved hydrogen production of Au-Pt-CdS hetero-nanostructures by efficient plasmon-induced multipathway electron transfer. Adv Funct Mater 26:6076–6083
Ning J, Zou B (2018) Controlled synthesis, formation mechanism, and applications of colloidal Ag8SnS6 nanoparticles and Ag8SnS6/Ag2S heterostructured nanocrystals. J Phys Chem C 122:6566–6572
Li X, Schaak RE (2017) Reactive AgAuS and Ag3AuS2 synthons enable the sequential transformation of spherical nanocrystals into asymmetric multicomponent hybrid nanoparticles. Chem Mater 29:4153–4160
Xia Y, Xiong Y, Lim B, Skrabalak SE (2009) Shape-controlled synthesis of metal nanocrystals: simple chemistry meets complex physics. Angew Chem Int Ed 48:60–103
Casavola M, Buonsanti R, Caputo G, Cozzoli PD (2008) Colloidal strategies for preparing oxide-based hybrid nanocrystals. Eur J Inorg Chem 2008:837–854
Carbone L, Cozzoli PD (2010) Colloidal heterostructured nanocrystals: synthesis and growth mechanisms. Nano Today 5:449–493
Zou Y, Sun C, Gong W, Yang X, Huang X, Yang T, Lu WB, Jiang J (2017) Morphology-controlled synthesis of hybrid nanocrystals via a selenium-mediated strategy with ligand shielding effect: the case of dual plasmonic Au-Cu2-xSe. ACS Nano 11:3776–3785
Ma YY, Li WY, Eun Chul C, Li ZY, Taekyung Y, Zeng J, Xie ZX, Xia YN (2010) Au@Ag core-shell nanocubes with finely tuned and well-controlled sizes, shell thicknesses, and optical properties. ACS Nano 4:6725–6734
Yuan P, Ma R, Xu Q (2015) Highly sensitive and selective two-photon sensing of cartap using Au@Ag core-shell nanoparticles. SCIENCE CHINA Chem 59:78–82
Jia GZ, Lou WK, Cheng F, Wang XL, Yao JH, Dai N, Lin HQ, Chang K (2015) Excellent photothermal conversion of core/shell CdSe/Bi2Se3 quantum dots. Nano Res 8:1443–1453
Shi R, Cao YH, Bao YJ, Zhao YF, Waterhouse G.I.N, Fang ZY, Wu LZ, Tung CH, Yin YD, Zhang TR (2017) Self-assembled Au/CdSe nanocrystal clusters for plasmon-mediated photocatalytic hydrogen evolution. Adv Mater 29:1700803
Special thanks to Wei Wang from Wuhan University for providing support of checking references.
This work was supported by the National Key R&D Program of China (Grant No. 2017YFA0303402), the National Natural Science Foundation of China (Grant Nos. 11674254, 91750113, 11874293, and 11504105), the Hubei Provincial Natural Science Foundation of China, and the Natural Science Foundation of Hunan Province (Grant Nos. 2019JJ50367).
The authors declare that they have no competing interests.
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
About this article
Cite this article
Liu, XD., Chen, K., Ma, S. et al. Synthesis of Au/CdSe Janus Nanoparticles with Efficient Charge Transfer for Improving Photocatalytic Hydrogen Generation. Nanoscale Res Lett 14, 349 (2019). https://doi.org/10.1186/s11671-019-3185-6
- Au/CdSe Janus nanospheres
- Highly efficient photocatalysis