(Mn, Zn) Co-Doped CdS Nanowires

(Mn, Zn) co-doped CdS (Cd 0.8 Mn 0.01 Zn 0.17 S, Cd 0.78 Mn 0.15 Zn 0.07 S, and Cd 0.67 Mn 0.3 Zn 0.07 S) 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 (Cd 1- x Mn x S, 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.