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Fig. 5 | Nanoscale Research Letters

Fig. 5

From: Raman Techniques: Fundamentals and Frontiers

Fig. 5

a Spontaneous Stokes and anti-Stokes Raman spectrum of carbon tetrachloride (liquid) excited by an argon ion laser, \( {\overset{\sim }{\nu}}_{\mathrm{p}}=20487 \) cm−1. The spectrum is presented according to recommendations of the International Union of Pure and Applied Chemistry. b i Raman spectra of thin multi-layer (nL) and bulk MoS2 films. The solid line for the 2 L spectrum is a double Voigt fit through data (circles for 2L, solid lines for the remainder). b ii Frequencies of \( {\mathrm{E}}_{2\mathrm{g}}^1 \) and A1g Raman modes (left vertical axis) and their difference (right vertical axis) as a function of the number of layers. b iii, iv spatial maps (23 μm × 10 μm) of Raman frequency of \( {\mathrm{E}}_{2\mathrm{g}}^1 \) (iii) and A1g (iv) from a sample of thin MoS2 films deposited on a SiO2/Si substrate. b v Atomic displacements of the four Raman-active modes and one infrared-active mode (E1u) in the unit cell of the bulk MoS2 crystal as viewed along the [1000] direction. c Microscopic image of nebulised ammonium sulphate aerosol particles on: i, Klarite; iii, silicon wafer. ii, iv Raman mapping image of sample (i) and (iii), respectively. d i Pseudo colour broadband CARS image of tumour and normal brain tissue, with nuclei highlighted in blue, lipid content in red and red blood cells in green. d ii Broadband CARS image and axial scan (below) with nuclei highlighted in blue and lipid content in red. d iii Broadband CARS image with nuclei highlighted in blue, lipid content in red and CH3 stretch–CH2 stretch in green. NB, normal brain; T, tumour cells; RBC, red blood cells; L, lipid bodies; WM, white matter. d iv Single-pixel spectra. e Raman thermography measurements across the active region of a high electron mobility transistor on SiC substrate with both E2 and A1 (LO) phonons considered to compensate for thermal stress. Device temperature rise determined using either E2 or A1 (LO) phonon mode alone (neglecting thermal stress) is shown in the top left insert. f (left) illustration of the manipulation of a straight isolated carbon nanotube (CNT) lying on a glass substrate by the sharp apex of an AFM tip. f (right) two-dimensional image of a CNT constructed by colour-coding the frequency position of the G+ vibrational mode in TERS spectra. The colour variation shows the strain distribution along the CNT at high-spatial resolution. a reproduced with permissions from [1]. b Adapted with permission from [217]. c Reprinted with permission from [96]. d Reprinted by permission from [167]. e Reprinted from [218]. f Reprinted by permission from [219].

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