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Figure 4 | Nanoscale Research Letters

Figure 4

From: Morphological control of heterostructured nanowires synthesized by sol-flame method

Figure 4

Schematic illustration of the effects of metal salt precursor on the morphology of Co 3 O 4 on CuO NWs. A CuO NW is dip-coated with a cobalt precursor solution containing the solvent and cobalt salt and then annealed in the flame. (Left column) In the case of a volatile precursor (e.g., Co(CH3COO)2·4H2O), the precursor evaporates into vapor and nucleation of the Co3O4 occurs in the gas phase, resulting in the formation of the NP-chain morphology. (Right column) In the case of a non-volatile precursor (e.g., Co(NO3)2·6H2O), the precursor does not evaporate but stays in the solvent, where nucleation happens in the liquid phase, resulting in the formation of the shell morphology.

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