Hydrothermal synthesis and characterization of CuInSe2 nanoparticles using ethylenediamine as capping agent

• CuInSe2 nanoparticles were synthesized with ethylenediamine as capping agent.
• Nanorods and cube morphology were observed for hydrothermal synthesis.
• Spherical nanoparticles were obtained by wet chemical method.
• Synthesized nanoparticles exhibits wurtzite phase and B2 LO mode.

Ethylenediamine capped CuInSe2 nanoparticles were synthesized by wet chemical method at room temperature and hydrothermal method at 150 °C for 2 h at two different mole ratio of the capping agent. The effect of the synthesis method and ratio of the capping agent on the optical, structural, and morphology of the synthesized nanoparticles were analyzed. The optical property of the synthesized nanoparticles was estimated from the UV–Vis spectra and also from the emission spectra. The surface capping was confirmed through the FT-IR. Powder XRD analysis reveals that the nanoparticles exhibit wurtzite phase and the crystallinity increases while increasing the capping ratio and hydrothermally synthesized nanoparticles show higher crystallinity. Raman analysis shows that the hydrothermally synthesized samples exhibit B2 (LO) mode. The surface morphology was modified depending on the synthesis method and capping agent ratio (i.e.) rod like and cube like morphology were obtained for the hydrothermally synthesized nanoparticles with 5 and 10 mol ratio of the capping agents respectively.

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