A facile route for synthesizing CuInSe₂ nanocrystals was developed using mercaptoacetic acid as capping agent and water as solvent. Two different mole ratios (5 & 10) of mercaptoacetic acid was used to synthesis CuInSe₂ nanoparticles by wet chemical method and similar ratio of capping agent was also used for the preparation by hydrothermal method. The synthesis method and the ratio of the capping agent have influence over the structure and morphology of the synthesised nanoparticles. There are some significant changes in the structure of the CuInSe₂ nanoparticles which was confirmed through the XRD. The samples prepared by wet chemical method shows wurtzite phase while the hydrothermally prepared samples shows chalcopyrite phase and at the same the crystallinity of samples increases with increasing the mole ratio of the capping agent as well as varying the synthesis method. Raman analysis shows a strong band at 233 cm^-1 is due to the combination of B₂ + E mode. The surface capping was confirmed from the FTIR analysis. The thermal stability of the samples was also studied through the TGA-DSC analysis. The changes in morphology of the synthesized samples were analyzed from the SEM and it shows that the sample prepared by wet chemical method is spherical with 5 & 10 mole ratio of thiol while hydrothermally synthesized samples were nanotubes and nanoflakes. The TEM analysis shows larger grains for the hydrothermally prepared sample with 10 mole ratio of thiol.  The results are discussed in detail.

SEM & TEM image of wetchemically synthesised CuInSe₂ nanoparticles with ten mole ratio of capping agents

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