We described a facile method for preparing CdSe/CdS/ZnS core/shell/shell nanocrystals from air-stable single source precursors.The single source precursors of cadmium ethylxanthate and zinc ethylxanthate were used to form CdS and ZnS shell layers in octadecene.An efficient modification of CdSe/CdS/ZnS nanocrystals was subsequently performed to obtain hydrophilic nanocrystal fluorophores with good stability in a pH range of 1.6—10.
We presented a simple route to prepare nanoscale CdTe urchins in a tri-n-octylphosphine oxide（TOPO） system. CdTe urchins consisted of a core and several attached arms. The arms were ca. 3 nm wide, and their lengths could be controlled with the reaction time. The authors investigated the optical absorption and structural properties of the prepared CdTe. The lengths of the arms could be tuned into CdTe nanourchins, which led to a change in the photophysical properties of the nanoscale CdTe urchins. The results, including transmission electron microscopy（TEM） and absorption spectra, indicated that mesoporous silica and aminopropyltriethoxysilane（APTES） contributed to the formation of nanoscale CdTe urchins.
BAO Jian SHEN Yue SUN Yan YUE Yang CHEN Xin DAI Ning
