Structural and impedance analysis of tin-sulphide (SnS) nanoparticles produced with the help of hydrothermal process

The three samples of SnS with different molarity 1ml, 0.5ml and 0.25ml were prepared by hydrothermal method. The prepared samples were characterized by XRD, SEM and impedance spectroscopies. XRD confirmed the cubic and orthorhombic structure of SnS. The average size of nanoparticles was noted to be about 12.77 nm, 16.43 nm and 16.44 nm at 140 °C. These nanoparticles were of cubic and orthorhombic forms. Average strain came out to be 0.215, 0.142 and 0.140. This result shows that by changing molarity, crystal structure of SnS can be changed. Crystallite size is increasing with decreasing molarity while strain is decreasing. Scanning electron microscopy (SEM) was carried out in order to study sheet like morphology of the samples. The carried-out process showed that the produced sample shows ball resembling spherical form. On the other hand, the frequency distribution and calculation of mean size of SnS nanoparticles, histogram and Gaussian curve were drawn and analyzed. Size range of nano-particles for sample 1ml, 0.5ml and 0.25ml was between (10 ̶65) nm, (20 ̶120) nm, (10 ̶90) nm, respectively. The real part of impedance Z’ got maximum value of 0.173 MΩ, 0.31 MΩ, and 0.40 MΩ at three different molarities. Maximum values of imaginary impedance observed were 0.053 MΩ (1ml), 0.112 MΩ (0.5ml) and 0.14 MΩ at different Debye relaxation peaks. The results show that reduction in the molarity increases the impedance and decreases the capacitance.