关键词: TiO₂, 杂化微球, 结晶, 表面光电压谱

Abstract: Hybrid microballs with polystyrene cores coated by titania nanoparticles were prepared by miniemulsion polymerization. The crystallization morphology and photovoltage properties of the hybrid particles after calcination were characterized by Scanning Electron Microscope(SEM), X-ray diffraction and surface photovoltage spectra(SPS). The crystal morphology has a critical effect on the threshold. It is found that the materials become prous, the thresholds of TiO₂ particles blue-shift with their particle sizes decreasing and crystal phase changing from anatase TiO₂ to rutile TiO₂. The SPS results showed that the peak height was three times the height of common TiO₂ nanoparticles.

Key words: TiO₂, Hybrid microballs, Crystallization, Surface photovoltage spectrum(SPS)