Samples of nitrogen-doped titanium dioxide (anatase, $0.2 \leq N \leq1.0~wt\%$) prepared by the sol-gel method were investigated using X-band EPRspectroscopy, photoconductivity and photocatalysis measurements. $N\bullet$ and$NO\bullet$ paramagnetic defects in N-TiO2 have been observed; theirconcentrations and spin-Hamiltonian parameters were calculated. An increaseboth in the rate of the generation of free charge carriers and in the rate ofphotocatalysis was found in N-TiO2 in contrast with non-doped titania undervisible light. The correlation of the density of the observed radicals with thephotoconductivity and photocatalysis data is discussed.
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机译：使用X-波段EPR光谱，光导率和光催化测量研究了通过溶胶-凝胶法制备的氮掺杂二氧化钛样品（锐钛矿型，$ 0.2 \ leq N \ leq1.0〜wt \％$）。观察到N-TiO2中的$ N \ bullet $和$ NO \ bullet $顺磁缺陷；计算它们的浓度和自旋哈密顿参数。与未掺杂的二氧化钛可见光相比，在N-TiO2中发现了自由电荷载流子的生成速率和光催化速率的增加。讨论了观察到的自由基的密度与光电导率和光催化数据的相关性。
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