(Mn, Zn) Co-doped CdS nanowires

(Mn, Zn) co-doped CdS (Cd0.8Mn0.01Zn0.17S, Cd0.78Mn0.15Zn0.07S, and Cd0.67Mn0.3Zn0.07S) nanowires (or nanobelts) were synthesized using the vapor transport method. Their X-ray diffraction patterns reveal a significant contraction of the lattice constants of up to 1.5%, due to the incorporation of Mn and Zn. The electronic structures of the Cd, Mn, and Zn atoms were probed by X-ray photoelectron spectroscopy and compared with those of the Mn-doped CdS (Cd1-xMnxS, where x = 0.1, 0.2, and 0.3) nanowires. As the concentration of Mn increases, the binding energy of the Cd 3d, Mn 2p, and Zn 2p peaks shifts to a lower energy, and the peak width becomes broader, indicating the effective incorporation of Mn and Zn into the CdS lattices. The photoluminescence spectrum reveals that the band-edge emission peak shifts to a higher energy with the Mn doping but to a lower energy with the Zn doping. The magnetization curves suggest the existence of room-temperature ferromagnetic behavior.