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A Solvothermal Synthesis of the CdS Nanorods Doped with Cr and Investigation of Ferromagnetic and Optical Properties at Room Temperature

Abstract Cr-doped CdS nanorods with room temperature enhanced ferromagnetism have been successfully synthesized by solvothermal reaction. The products were distinctly assigned to the hexagonal phase cadmium sulfide by X-ray diffraction (XRD) measurements. Transmission electron microscopy (TEM) images revealed that the morphologies of CdS doped with different contents chromium were all nanorods. The CdS nanorods morphologies with lengths of 100–350 nm and average diameters of 20–30 nm were almost independent on the quality of introduced chromium. Energy dispersive spectrum (EDS) measurements demonstrated that the synthesized products were consisted of S, Cd and Cr. The vibrating sample magnetometer (VSM) indicated that the Cr-doped CdS nanorods had ferromagnetism at room temperature, while the pure CdS nanorods had weak ferromagnetism. The saturation magnetization Ms of Cr-doped CdS nanorods (Cr = 4.17at%, 7.31at%) was approximately 3.907 and 8.798 (10−3emu/g), respectively. The coercivity of Hc was approximately 96.21, 137.15 Oe. The ferromagnetism of CdS nanorods was associated with Cr substitution in the CdS lattice.