We report the dispersion and scanning tunneling microscopy （STM） characterization of iso- lated Au-CdSe nanohybrids on atomically fiat Au（111） through surface modifications. The top terminal groups of spacer molec...We report the dispersion and scanning tunneling microscopy （STM） characterization of iso- lated Au-CdSe nanohybrids on atomically fiat Au（111） through surface modifications. The top terminal groups of spacer molecules self-assembled on the surface are found critical for locking the nanohybrids into a well-separated state. The STM results indicate that both thiol and carboxylic terminals are effective in this aspect by making strong interaction with the Au portions of the nanohybrids. An argon ion sputtering technique is also proposed to clean up organic contaminants on the surface for improved STM imaging of individual Au-CdSe nanohybrids. These observations help to enrich technical approaches to dispersing individual nanostructures on the surface and provide opportunities to explore their local electroluminescent and energy transfer properties at the nanoscale.展开更多
In this paper,Cd1-xZnxS thin films were prepared by chemical bath deposition(CBD),and the effects of different zinc doping content on the morphological structure and optical properties of Cd1-xZnxS buffer layers are s...In this paper,Cd1-xZnxS thin films were prepared by chemical bath deposition(CBD),and the effects of different zinc doping content on the morphological structure and optical properties of Cd1-xZnxS buffer layers are systematically discussed.The experimental results show that in the deposition process of different substrates,the crystal structure of the film is all hexagonal,and when the concentration of zinc sulfate(ZnSO4)precursor is varied from 0 to 0.025 M,the films are uniform and dense.With the increase of zinc content,the X-ray diffraction(XRD)peak of the films shifted behind that of CdS film(002).It showed 70%to 90%transmittance in the visible region and the optical band gap increased gradually.The band gap value of the films obtained ranged from 2.43 eV to 3.01 eV.It shows the potential feasibility of its application to photovoltaic devices.展开更多
文摘We report the dispersion and scanning tunneling microscopy （STM） characterization of iso- lated Au-CdSe nanohybrids on atomically fiat Au（111） through surface modifications. The top terminal groups of spacer molecules self-assembled on the surface are found critical for locking the nanohybrids into a well-separated state. The STM results indicate that both thiol and carboxylic terminals are effective in this aspect by making strong interaction with the Au portions of the nanohybrids. An argon ion sputtering technique is also proposed to clean up organic contaminants on the surface for improved STM imaging of individual Au-CdSe nanohybrids. These observations help to enrich technical approaches to dispersing individual nanostructures on the surface and provide opportunities to explore their local electroluminescent and energy transfer properties at the nanoscale.
基金supported by the Fund for Creative Research Groups。
文摘In this paper,Cd1-xZnxS thin films were prepared by chemical bath deposition(CBD),and the effects of different zinc doping content on the morphological structure and optical properties of Cd1-xZnxS buffer layers are systematically discussed.The experimental results show that in the deposition process of different substrates,the crystal structure of the film is all hexagonal,and when the concentration of zinc sulfate(ZnSO4)precursor is varied from 0 to 0.025 M,the films are uniform and dense.With the increase of zinc content,the X-ray diffraction(XRD)peak of the films shifted behind that of CdS film(002).It showed 70%to 90%transmittance in the visible region and the optical band gap increased gradually.The band gap value of the films obtained ranged from 2.43 eV to 3.01 eV.It shows the potential feasibility of its application to photovoltaic devices.
