• J. Ruby Jemima
• S. Kalyanaraman
• R. Vettumperumal
• D.S. Ivan Jebakumar
• R. Biju Bennie

Copper iodide (CuI) nanoparticles were synthesized by conventional precipitation method and annealed at four different temperatures to observe the changes in structural, morphological and optical properties. The X-ray diffractograms reveal the existence of zinc blende γ-phase of CuI till 200oC whereas CuO monoclinic phase begin to emerge in the samples annealed above the temperature. Moreover, the IR interferogram of the samples annealed at temperatures 300oC and 400oC indicate the presence of both CuI and CuO in the samples confirming the presence of mixed phase. From the absorbance spectra, the optical bandgap for the samples annealed below 200oC were calculated which is found to be identical (2.9 eV) and at higher annealing temperature the emerging CuO nanoparticles due to its extensive absorption in visible region obscured the absorption characteristics of CuI. The presence of CuO in the samples annealed above 300oC is evident from the hump in the absorption spectrum at 675nm. In addition to the blue emission peak of CuI at 430 nm, the defect peak at 684 nm could be observed in the samples annealed above 200oC. The scanning electron micrographs and EDAX analysis confirms the nucleation of CuO nanoparticles with reduced dimensionality in the CuI matrix at higher annealing temperatures.

copper iodide, nanoparticles, copper oxide, annealing, optical bandgap

"Effect of Annealing Temperature on the Structural and Optical Properties of CuI Nanoparticles", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 12, page no.162-166, December-2018, Available :http://www.jetir.org/papers/JETIR1812721.pdf

"Effect of Annealing Temperature on the Structural and Optical Properties of CuI Nanoparticles", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 12, page no. pp162-166, December-2018, Available at : http://www.jetir.org/papers/JETIR1812721.pdf