TiO2 nanocrystals/graphene （TiO2/GR） composite are prepared by combining flocculation and hydrothermal reduction technology using graphite oxide and TiO2 colloid as precursors. The obtained materials are examined by...TiO2 nanocrystals/graphene （TiO2/GR） composite are prepared by combining flocculation and hydrothermal reduction technology using graphite oxide and TiO2 colloid as precursors. The obtained materials are examined by scanning electron microscopy, transition electron microscopy, X-ray diffraction, N2 adsorption desorption, and ultraviolet-visible diffuse spectroscopy. The results suggest that the presence of TiO2 nanocrystals with diameter of about 15 nm prevents GR nanosheets from agglomeration. Owing to the uniform distribution of TiO2 nanocrystals on the GR nanosheets, TiO2/GR composite exhibits stronger light absorption in the visible region, higher adsorption capacity to methylene blue and higher efficiency of charge separation and transportation compared with pure TiO2. Moreover, the TiO2/GR composite with a GR content of 30% shows higher photocatalytic removal efficiency of MB from water than that of pure TiO2 and commercial P25 under both UV and sunlight irradiation.展开更多
This paper describes a new design for the test light source of an L/U-band extended optical fiber line testing system and the side-band suppresser ratio of the test light should be more than 70 dB.
A high-speed dynamic-range-extended white light interferometry(HS-DRE-WLI) system is developed for fast,high-resolution 3D surface profiling across varying reflectance levels. The system combines high-speed fiber-stre...A high-speed dynamic-range-extended white light interferometry(HS-DRE-WLI) system is developed for fast,high-resolution 3D surface profiling across varying reflectance levels. The system combines high-speed fiber-stretcher-based optical path difference modulation with an asymmetric line-illumination technique to enhance imaging speed and dynamic range. Chromatic and polarization-induced distortions are minimized through dispersion compensation using optimized fiber lengths and a Faraday rotator, achieving 14.2-μm axial resolution. Validated on diverse samples, the system captures fine and large-scale features with high fidelity,demonstrating strong potential for industrial and biomedical applications requiring accurate, robust surface measurements.展开更多
文摘TiO2 nanocrystals/graphene （TiO2/GR） composite are prepared by combining flocculation and hydrothermal reduction technology using graphite oxide and TiO2 colloid as precursors. The obtained materials are examined by scanning electron microscopy, transition electron microscopy, X-ray diffraction, N2 adsorption desorption, and ultraviolet-visible diffuse spectroscopy. The results suggest that the presence of TiO2 nanocrystals with diameter of about 15 nm prevents GR nanosheets from agglomeration. Owing to the uniform distribution of TiO2 nanocrystals on the GR nanosheets, TiO2/GR composite exhibits stronger light absorption in the visible region, higher adsorption capacity to methylene blue and higher efficiency of charge separation and transportation compared with pure TiO2. Moreover, the TiO2/GR composite with a GR content of 30% shows higher photocatalytic removal efficiency of MB from water than that of pure TiO2 and commercial P25 under both UV and sunlight irradiation.
文摘This paper describes a new design for the test light source of an L/U-band extended optical fiber line testing system and the side-band suppresser ratio of the test light should be more than 70 dB.
基金National Research Foundation of Korea(NRFRS-2021-NR060086)Korea Evaluation Institute of Industrial Technology(1415181752)Institute of Civil-Military Technology Cooperation(23-SF-EL-09).
文摘A high-speed dynamic-range-extended white light interferometry(HS-DRE-WLI) system is developed for fast,high-resolution 3D surface profiling across varying reflectance levels. The system combines high-speed fiber-stretcher-based optical path difference modulation with an asymmetric line-illumination technique to enhance imaging speed and dynamic range. Chromatic and polarization-induced distortions are minimized through dispersion compensation using optimized fiber lengths and a Faraday rotator, achieving 14.2-μm axial resolution. Validated on diverse samples, the system captures fine and large-scale features with high fidelity,demonstrating strong potential for industrial and biomedical applications requiring accurate, robust surface measurements.
