• Minal Vansia
• Kishor C.Poria

Abstract : Thiourea (NH₂CSNH₂) single crystals have attracted significant attention due to their nonlinear optical (NLO) properties, wide optical transparency, and structural flexibility for forming molecular complexes. In this study, high-quality thiourea single crystals were grown by the slow evaporation solution growth technique and subjected to ultraviolet–visible (UV–Vis) and Fourier transform infrared (FTIR) spectroscopic analyses. The optical transmission spectrum reveals excellent transparency in the visible region with a sharp absorption edge, enabling the estimation of the optical band gap. FTIR spectral analysis confirms the presence of characteristic functional groups such as N–H, C–N, and C=S vibrations, validating the structural purity of the grown crystal. The combined results highlight the potential of thiourea single crystals for photonic and optoelectronic device applications.

Thiourea single crystal, UV–Vis spectroscopy, FTIR spectroscopy, Optical band gap, Nonlinear optics

"Ultra-Violet and FTIR Spectroscopic Studies of Thiourea Single Crystals ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.12, Issue 8, page no.e518-e521, August-2025, Available :http://www.jetir.org/papers/JETIR2508470.pdf

"Ultra-Violet and FTIR Spectroscopic Studies of Thiourea Single Crystals ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.12, Issue 8, page no. ppe518-e521, August-2025, Available at : http://www.jetir.org/papers/JETIR2508470.pdf