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Co doping CdS nanocrystals were synthesized in aqueous solution using mercaptoacetic acid as stabilizer. The prepared nanocrystals were examined using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR) and UV-vis absorption spectroscopy (ABS). The cubic zinc blende nanocrystals were determined and the sizes were estimated by XRD. The compositions of...
We report on the room temperature ferromagnetism in Co-doped wurtzite ZnS nanocrystals with size of about 5 nm, which gradually becomes weak as the increase of doping concentration. The coercivities for all samples maintain at about 200 Oe, and the saturation magnetic moment per Co ion decreases sharply for high doping samples. Besides ferromagnetism and paramagnetism, the temperature dependence of...
The ZnO nanotretapods prepared by a catalyst-free thermal oxidation between zinc vapor and oxygen were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and photoluminescence spectroscopy (PL). To improve the gas-mixing in the reactor, nitrogen gas was supplied in pulse into the reaction zone. This method could affect the oxygen vacancy...
The control dimension and morphology in zinc oxide (ZnO) nanorods are critical issues in the fabrication of electronic and optical nanodevices. This study discusses ZnO nanorods on an ITO-laminated plastic substrate of polyethylene terephthalate. The substrate was immersed in a zinc nitrate hexahydrate Zn(NO3)2.6H2O and hexamethylenetetramine C12H6N4. solution under various deposition conditions....
Controlled doping appropriate elements into semiconductor nanostructures is of vital importance to develop novel materials and functional devices. Herein, we present three methods to synthesize Cu-doped ZnO nanostructures using a simple vapor phase transport process and adopting CuCl2, CuO or Cu as doping precursors. The corresponding morphology, structure, and chemical composition were investigated...
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