The lattice parameters for the derivatives of cadmium telluride,CdTe1-xSbx,with the zinc blend crystal structure are calculated using the generalized gradient approximation method; which is based on the density functi...The lattice parameters for the derivatives of cadmium telluride,CdTe1-xSbx,with the zinc blend crystal structure are calculated using the generalized gradient approximation method; which is based on the density functional theory （DFT）. The effects of antimony （Sb） on the lattices,electric bands,electronic state density,absorption spectroscopy,and band gap between the valence band maximum （VBM） and the conduction band minimum （CBM） of CdTe1-xSbx are discussed. The results show that the antimonic atoms in the lattice are advantageous in promoting the hole concentration and conductivities of CdTe1-xSbx. The increase of the Sb content in CdTe1-xSbx reduces the interaction among Cd,Te,and Sb; resulting in a decreased binding energy within CdTe1-xSbx as well as an increase in the electronic gap. Also discussed are the mechanics for the lattice phase change of CdTe1-xSbx at x=0.5.展开更多
This paper explored the feasibility for the application of luminescent CdTe quantum dots prepared in aqueous phase to live cell imaging. The highly luminescent CdTe quantum dots （QDs） were first prepared in aqueous ...This paper explored the feasibility for the application of luminescent CdTe quantum dots prepared in aqueous phase to live cell imaging. The highly luminescent CdTe quantum dots （QDs） were first prepared in aqueous phase, and then were covalentiy coupled to a plant lectin （UEA-1）, as a fluorescent probe. After incubating with of human umbilical vein endothelial cells （HUVECs）, the QD probe with UEA-1 was able to specifically bind the corresponding cell receptor. The good cell images were obtained in live cells using laser confocal scanning microscopy. We predict that QDs prepared in water phase will probably become an attractive alternative probe in cellular imaging and bio-labeling.展开更多
文摘The lattice parameters for the derivatives of cadmium telluride,CdTe1-xSbx,with the zinc blend crystal structure are calculated using the generalized gradient approximation method; which is based on the density functional theory （DFT）. The effects of antimony （Sb） on the lattices,electric bands,electronic state density,absorption spectroscopy,and band gap between the valence band maximum （VBM） and the conduction band minimum （CBM） of CdTe1-xSbx are discussed. The results show that the antimonic atoms in the lattice are advantageous in promoting the hole concentration and conductivities of CdTe1-xSbx. The increase of the Sb content in CdTe1-xSbx reduces the interaction among Cd,Te,and Sb; resulting in a decreased binding energy within CdTe1-xSbx as well as an increase in the electronic gap. Also discussed are the mechanics for the lattice phase change of CdTe1-xSbx at x=0.5.
基金This work was financially supported by the National Natural Science Foundation of China （No. 20335020, 90408014） and the Nano-Science Foundation of Shanghai （0452NM052, 05NM0500 -2）.
文摘This paper explored the feasibility for the application of luminescent CdTe quantum dots prepared in aqueous phase to live cell imaging. The highly luminescent CdTe quantum dots （QDs） were first prepared in aqueous phase, and then were covalentiy coupled to a plant lectin （UEA-1）, as a fluorescent probe. After incubating with of human umbilical vein endothelial cells （HUVECs）, the QD probe with UEA-1 was able to specifically bind the corresponding cell receptor. The good cell images were obtained in live cells using laser confocal scanning microscopy. We predict that QDs prepared in water phase will probably become an attractive alternative probe in cellular imaging and bio-labeling.
