CdS nanoparticles were synthesized by the microwave assisted chemical precipitation method and solvothermal method. X-ray power diffraction, scanning electron microscopy, and transmission electron microscopy were employed to characterize the crystalline structure, morphology, and size of the synthesized samples. X-ray diffraction studies reveal that the synthesized samples are of two different forms, cubic and hexagonal. The DC electrical resistance of the two samples was measured in the temperature range 300–500 K. Near room temperature cubic nanoparticles behave as a semiconductor, and hexagonal nanoparticles show the behavior of an insulator. The temperature resistance curves of the cubic sample show a transition from the cubic to hexagonal phase above 340 K. The temperature resistance curve of the hexagonal sample also shows a discontinuity at 463 K due to the transition from the hexagonal to cubic phase. The thermogravimetric analysis of the two samples also confirms the two transitions. UV, PL, and Raman spectra of the two forms are compared.

Microwave-assisted chemical precipitation was used to prepare CuxCd1–xS (x = 0.8, 0.6, 0.4, and 0.2) nanoparticles mixture. The crystal structure, size, and surface morphology of the as-synthesized nanoparticles were studied using X-ray diffraction and SEM. Presence of copper, cadmium, and sulphur in proper ratios in the samples was confirmed by energy-dispersed X-ray analysis. DC electrical resistance measurements of all the samples in the temperature range of 300…500 K showed phase transition above a certain temperature.

This paper demonstrates the synthesis of NixCd1-xS (x=0.8,0.6,0.4,0.2) nanoparticles by microwave-assisted chemical precipitation method. The prepared samples were characterized by XRD, EDAX, SEM, UV-VIS, and PL spectroscopy. The energy-dispersive x-ray analysis confirms the existence of Nickel, Cadmium and Sulphur in proper ratios. The DC electrical resistances were measured in the temperature range of 300 K-500 K. The temperature resistance curves of all the samples show phase transitions above a particular temperature. The UV and PL spectra of all the samples were compared and studied.

The NiS nanoparticles were synthesised by the microwave-assisted chemical precipitation method. The XRD pattern shows that the prepared NiS nanoparticles have an orthorhombic structure. The SEM image of NiS nanoparticles confirms the nanostructure. The energy-dispersive X-ray analysis confirms the existence of Nickel and Sulphur in a proper ratio. The D.C. electrical resistances were measured in the temperature range 300 K–500 K. Oscillations were found in the temperature resistance curve of Nickel Sulphide nanoparticles on repeated heating and cooling due to phase transition. The XRD pattern of the powdered form of the NiS pellet used for the resistance measurement also confirms this phase transition. The two forms of UV and PL spectra of NiS nanoparticles were studied.

ZnxCu1-xS (x = 0.8, 0.6, 0.4 and 0.2) nanoparticles were synthesized by microwave assisted chemical precipitation method. The as-synthesized nanoparticles were characterized by X ray diffraction, SEM and TEM analysis to study the crystal structure, size and surface morphology. The energy dispersed x-ray analysis confirms the presence of Zinc, Copper and Sulphur in proper ratio. The D.C. electrical resistance was measured in the temperature range 300K-500K. All the samples show phase transition above a particular temperature. UV, PL and Raman spectra of all the samples were compared and studied.