科研之友
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摘要
In this paper, we employed a simple and cost-e r ective thioglycolic acid (TGA) free hydrothermal method, based on thiourea hydrolysis of stannous chloride dihydrate [SnCl2.2H(2)O] at 160 degrees C-190 degrees C for 6 h, for the synthesis of SnS nanoparticles. The e r ect of hydrothermal autoclave reaction temperature on various properties of SnS nanoparticles have been examined at length using X-ray di r raction, Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), field-emission scanning electron microscopy attached with EDAX (FE-SEM), transmission electron microscopy (TEM) and ultraviolet-visible (UV-Vis) spectroscopy. The results suggest that the crystallization of orthorhombic SnS nanoparticles, with size varying from 3 nm to 5 nm, formed at R-T = 60 degrees C. Further, the formation of SnS phase was confied by an IR Sn-S characteristic bands around 2350 cm(-1), 1041 cm(-1) and 570 cm(-1), and four distinguished Raman peaks at 95 cm(-1), 160 cm(-1), 189 cm(-1) and 220 cm(-1). The mechanism for the formation of SnS nanoparticles have been proposed and discussed. The SnS nanoparticles have exhibited reaction temperature dependent morphological features like nanoflowers, nanoflakes, spherical nanoparticles and nanogranules. The absorbance studies indicated both strong direct and weak indirect allowed transitions for SnS nanoparticles and the associated band gaps were found to be 1.5 eV and 1.19 eV, respectively. The dual band gap combination of SnS would favor strong direct absorption of carriers and improved minority carrier life time due to indirect nature, which means the grown particles are suitable for ideal absorber material for solar cell applications.
- 出版日期2017-10
