Synthesis And Photoelectric Properties Of CdS And CdSSe Nanoribbons

In this paper, a large number of long dimensions of CdS nanoribben and CdSSe nanoribbon have been synthesized by the thermal evaporation methods. Structure, optical properties and surface photovoltage of nanobelt were studied in detail, the main results are as follows:(1) The ultralong CdS nanostructrues have been analyzed in detail and the mechanism of crystal growth of ultralong CdS nanoribbon has been explained. the growth mechanism is interaction of VLS and VS. In the near-field scanning optical microscope to observe the nanoribbon's waveguide and photoluminescence,discover that CdS nanoribbon has good waveguide, PL spectrum has only one emission peak, show that nanoribbon has high crystallinity and little defects. UV-visible absorption spectrum reflect the strong quantum effects. In addition, surface photovoltaic spectrum of CdS nanobelts suggested that:compared with CdS particles, surface photovoltage response of CdS nano-materials is broader and more strength. And very sensitive to the increase of the external field, we believe that this is due to enhancement of self-built field.(2)We mixed CdSe and CdS powder to a certain percentage, with the same thermal evaporation method, different experimental conditions, we composed a large size, uniform morphology and different components of CdSSe nanobelts. By XRD analysis shows that that is still wurtzite structure, but only the lattice constant increases. In the near-field scanning optical microscope, show that the different components of CdSSe nanobelts emitted different colors of light, and there is only one emission peak. Show that CdSSe nanobelts is alloy, but not a simple combination of two components. By surface photovoltage spectrum (SPS), we find that CdSSe nanomaterial surface photovoltage response has obvious response and a greater range, from 300-750nm. And with the Field-induced SPS(FISPS), CdSSe nanometarial increased nearly 2000 times from Ov to+1 v, it have potential application in have potential application in enhanced stimulated emission, engineered 1-D waveguides and nanoscale or microscale photonic devices.