Rare earth phosphate core/shell nanostructures were synthesized via facile ultrasound irradiation method.XRD and TEM were em-ployed to characterize the structure and morphology properties.The photoluminescence(PL) properties of TbPO4/CePO4 and CePO4/TbPO4 core/shell nanorods were studied to explore the energy transfers from Ce3+ to Tb3+.In the Ce0.9Tb0.1PO4/LaPO4 core/shell nanorods,the PL intensity of Ce0.9Tb0.1PO4 nanorods was enhanced when the LaPO4 shells were coated.
We report a facile aqueous phase synthesis for prepar-ing water-soluble inverted core/shell ZnSe/CdSe semiconductor nanocrystals. The samples were characterized by X-ray diffraction (XRD),transmission electron microscopy (TEM),and their optical properties were investigated by using UV-vis-NIR spectropho-tometer and fluorescence spectrophotometer. The results indicate that the synthesized ZnSe/CdSe nanocrystals are inverted core/shell structure with diameter of about 5 nm. Furthermore,their absorption band-edge is red-shifted with the growth of CdSe shell; correspondingly,their emission wavelength can be tuned from 460 nm to 604 nm.
ZHOU Jing, JIANG Luwen, GUO Wen, JIANG Hai, HAO Zhonghua School of Physics and Technology, Wuhan University/Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, Wuhan 430072, Hubei, China
Silver nanorod arrays have been fabricated by alternat-ing current（AC） and pulsed direct current（DC） electrodeposition in porous anodic aluminum oxide（AAO） templates with controlled pore diameters of 19,38,and 65 nm,respectively.The variation of their optical absorption properties with the incident angle and the nanorods length（corresponding to the electrodeposition time） has been investigated.Optical absorption spectra show that the posi-tion of longitudinal surface plasmon resonance（LSPR） peak has a small blueshift with the increase of incident angle of the excitation light.While the aspect ratio of the nanorods increases,the position of LSPR peak first redshifts and then blueshifts to a certain wave-length.Furthermore,the position of LSPR peak can be tuned,ranging from 550 nm to 900 nm,which makes it possible to cou-ple various wavelength of excitation source to assist radiative en-ergy transfer to the acceptor.
Cadmium sulfide （CdS） nanowires were synthesized on Cd foil via a simple solvothermal reaction at 180℃ using thiosemicarbazide as the sulfide source and ethylenediamine as the solvent. The CdS nanowires are hexagonal-phase single crystals with an average diameter of 50 nm and length of several microns. The as-prepared CdS nanowires show an absorption peak of around 483 nm in the absorption spectrum. The CdS nanowires exhibit bright photoluminescence （PL） with two distinct emission bands at 503 nm and 697 nm, which shows that the as-prepared CdS nanowires are high-quality nanocrystals.
