CdS nanoclusters were synthesized by using n-octylthiol as a ligand and n-hexadecyltrimethyl-ammonium bromide (or n-tetrabutylammonium bromide) as an organic cation. Sizeselective precipitation techniques have enabled...CdS nanoclusters were synthesized by using n-octylthiol as a ligand and n-hexadecyltrimethyl-ammonium bromide (or n-tetrabutylammonium bromide) as an organic cation. Sizeselective precipitation techniques have enabled the preparation of different CdS Q-nanoparticles with narrow size distribution and mean diameters ranging from 2 to 5 nm. UV-Vis spectroscopy, transmission electron microscopy and small-angle X-ray scattering were used to determine the mean cluster size. Their size quantization effect has been observed in UV-Vis spectra, fluorescence spectra and small-angle X-ray diffraction, but it became too weak to be observed for large particles (2r > 10 nm). Moreover, their photo-catalysis has been studied by ESR technique and the results revealed that the photo-catalytic reaction occurred in the solution system and some free radicals such as CH2-OH in methanol, or CH3-CH-OH in ethanol were generated if some CdS Q-particles were added to methanol (or ethanol) and initiated by UV light at the same time, which may be very crucial in organic synthesis.展开更多
Polymethyl methacrylate cadmium was grafted on TiO2 surface via the surface initiated atomic transfer radical polymerization of methyl methacrylate cadmium from a surface tether initiator.The coordinated cadmium as th...Polymethyl methacrylate cadmium was grafted on TiO2 surface via the surface initiated atomic transfer radical polymerization of methyl methacrylate cadmium from a surface tether initiator.The coordinated cadmium as the source precursor reacts with H2S generates CdS nanoscrystal on TiO2 surface.The grain size of CdS is about 5 nm and stabilized by tether polymer chains.The light absorption of CdS/TiO2 is expanded to visible light region.展开更多
A new method for the synthesis of CdS nanocrystals in polymer-impregnated sol-gel matrix was（described）.The CdS nanocrystals were prepared by simply passing H2S in polymer/silica sol-gel composite matrix formed by t...A new method for the synthesis of CdS nanocrystals in polymer-impregnated sol-gel matrix was（described）.The CdS nanocrystals were prepared by simply passing H2S in polymer/silica sol-gel composite matrix formed by the in situ polymerization of tetraethoxysilane in Cd2+ containing polymer microgel.The synthesized CdS nanocomposite were characterized by means of X-ray diffraction（XRD）,UV-Vis spectroscopy and TEM.X-ray diffraction and TEM results show that hexagonal CdS nanocrystals are well dispersed in polymer/silica composite matrix.The results of UV-Vis spectroscopy demonstrate that the size of CdS nanocrystals can be adjusted from 1.0 nm to 2.4 nm by changing the amount of H2S.展开更多
基金supported by the National Natural Science Foundation of China(21175061,21007021)the Key Laboratory of Modern Agriculture Equipment and Technology(NZ201109)the China Postdoctoral Science Foundation(2012M520998)~~
文摘CdS nanoclusters were synthesized by using n-octylthiol as a ligand and n-hexadecyltrimethyl-ammonium bromide (or n-tetrabutylammonium bromide) as an organic cation. Sizeselective precipitation techniques have enabled the preparation of different CdS Q-nanoparticles with narrow size distribution and mean diameters ranging from 2 to 5 nm. UV-Vis spectroscopy, transmission electron microscopy and small-angle X-ray scattering were used to determine the mean cluster size. Their size quantization effect has been observed in UV-Vis spectra, fluorescence spectra and small-angle X-ray diffraction, but it became too weak to be observed for large particles (2r > 10 nm). Moreover, their photo-catalysis has been studied by ESR technique and the results revealed that the photo-catalytic reaction occurred in the solution system and some free radicals such as CH2-OH in methanol, or CH3-CH-OH in ethanol were generated if some CdS Q-particles were added to methanol (or ethanol) and initiated by UV light at the same time, which may be very crucial in organic synthesis.
基金supported by the National Natural Science Foundation of China(No.20973188)
文摘Polymethyl methacrylate cadmium was grafted on TiO2 surface via the surface initiated atomic transfer radical polymerization of methyl methacrylate cadmium from a surface tether initiator.The coordinated cadmium as the source precursor reacts with H2S generates CdS nanoscrystal on TiO2 surface.The grain size of CdS is about 5 nm and stabilized by tether polymer chains.The light absorption of CdS/TiO2 is expanded to visible light region.
文摘A new method for the synthesis of CdS nanocrystals in polymer-impregnated sol-gel matrix was（described）.The CdS nanocrystals were prepared by simply passing H2S in polymer/silica sol-gel composite matrix formed by the in situ polymerization of tetraethoxysilane in Cd2+ containing polymer microgel.The synthesized CdS nanocomposite were characterized by means of X-ray diffraction（XRD）,UV-Vis spectroscopy and TEM.X-ray diffraction and TEM results show that hexagonal CdS nanocrystals are well dispersed in polymer/silica composite matrix.The results of UV-Vis spectroscopy demonstrate that the size of CdS nanocrystals can be adjusted from 1.0 nm to 2.4 nm by changing the amount of H2S.
