Porphyrin-functionalized reduced graphene oxide (RGO-TPP) was prepared by 1,3-dipolar cycloaddition reaction and characterized by Fourier transform infrared spectroscopy, Raman, ultraviolet/visible absorption, fluorescence, and transmission electron microscopy. At the same level of linear transmittance, RGO-TPP exhibited more enhanced optical nonlinearities than RGO and the pristineporphyrin, implying a remarkable accumulation effect as a result of the covalent link between RGO and porphyrin. The role of energy/electron transfer in the optical nonlinearities of RGO-TPP was investigated by fluorescence and Raman spectroscopy. All the results displayed that RGO can be covalently functionalized with porphyrins by the proposed approach.
To make sure that high performance Microchannel Plate (HP-MCP) can be applied successfully in Gen Ⅲ Image Intensifier, vacuum baking test and trying out test are carried out first, then making ion barrier film onto input surface of HP-MCP, employing strict electron scrubbing test, and measuring resistance, gain in each stage, finally Gen Ⅲ Image intensifier is manufactured with HP-MCP. As a result, many data concerning with HP-MCP are gained and the conclusions indicate: the HP-MCP can be applied in Gen Ⅲ Image Intensifier, and can manufacture qualified product; thinking over batch production in the future, studying on the MCP' material and technique especially in compatibility between HP MCP and Gen Ⅲ image intensifier is enhanced.
As a two-dimensional vacuum electron multiplier device, the microchannel plate is made by solid method with lead silicate glass as the base material, and acid-base etching to remove the core material is a key step in the formation of the microchannel plate, which mainly affects the microstructure, morphology and composition of the inner wall surface, and then affects the electrical properties of the microchannel plate. The microscopic morphology of silicate glass under different etching processes was studied by scanning electron microscopy, and it was found that with the increase of acid-base alternation during the etching process, the particle density of the inner wall of the channel gradually decreased, and the energy spectrum analysis of the particles revealed that the main contents were Pb and Bi; further by AFM analysis, the particle peak height was reduced from 31.1 nm to 1.9 nm with roughness. The results of the electrical and noise properties of the microchannel plates show that an appropriate increase in acid-base alternation can effectively reduce the bulk resistance and dark current without reducing the gain of the microchannel plates. This shows that increasing the "erosion intensity" of the acid-base alternation multiple times during corrosion can effectively improve the core-skin diffusion layer, further affecting the physical and chemical transformation of the nanoscale morphology, pointing to a new direction for improving the electrical properties of microchannel plates made of silicate glass.
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