机构地区: 广东工业大学轻工化工学院
出 处: 《材料科学与工程学报》 2009年第4期613-616,共4页
摘 要: 采用基于密度泛函理论(DFT)框架下的第一性原理平面波赝势(PWPP)方法,模拟计算了Cu(II)掺杂锐钛矿TiO2,讨论了Cu(II)掺杂对锐钛矿的晶体结构、能隙、态密度等的影响。结果表明Cu(II)掺杂锐钛矿TiO2晶体后,Cu-3d与O-2p轨道上的电子发生强烈关联作用,使O-2p轨道发生分裂,禁带宽度(Eg)变小,TiO2的吸收带红移,从而有助于TiO2的光催化活性。 Using density function theory (DFT), the geometry, band structure and electronic density of states of Cu (Ⅱ) doped anatase titanium dioxide (Cu(Ⅱ)/TiO2) were studied at plane wave ultra-soft pseudo-Potential (PWPP) level. It shows that the 3d orbital of Cu(Ⅱ) interacts with O-2p orbital, which leads to the fission of the O-2p orbital and narrowing the band gap in Cu(Ⅱ)/TiO2. It may lead us to the conclusion that there should be a red shift of the absorption band to enhance the photocatalytic activity of TiO2 with the adulteration of Cu(Ⅱ).