论文部分内容阅读
石墨相C_3N_4(g-C_3N_4)是一种有重要应用前景的光催化材料,但因g-C_3N_4带隙较宽,导致其对可见光响应性不高及光生载流子复合率较高等问题。本文主要研究温度效应和掺杂效应对g-C_3N_4性质的影响,通过不同温度处理三聚氰胺制备了不同的g-C_3N_4样品及对g-C_3N_4进行富勒烯C_(70)的掺杂获得掺杂的g-C_3N_4材料。利用XRD、紫外吸收光谱、红外透射光谱分别研究不同温度处理及不同浓度C_(70)掺杂得到的g-C_3N_4样品,包括其成分、晶体结构、电子结构等方面特征。实验结果表明:在优化温度下烧制得到g-C_3N_4,掺入C_(70)后会使其带隙在一定范围内变窄。
Graphite phase C_3N_4 (g-C_3N_4) is an important photocatalytic material. However, due to the wide bandgap of g-C_3N_4, its photoresponsiveness to visible light is low and the photo-carrier recombination rate is high. In this paper, the effects of temperature effect and doping effect on the properties of g-C_3N_4 were studied. Different samples of g-C_3N_4 were prepared by melamine treatment at different temperatures and doping fullerenes C_ (70) of g-C_3N_4 to obtain doping g-C_3N_4 material. The samples of g-C_3N_4 obtained by different temperature treatments and different concentrations of C_ (70) doping were studied by XRD, UV-Vis absorption spectra and infrared transmission spectra respectively, including their composition, crystal structure and electronic structure. The experimental results show that g-C_3N_4 can be obtained by calcining at a proper temperature, and the band gap of C_ (70) can be narrowed within a certain range.