Cu掺杂TiO_2纳米粒子的溶胶-水热法制备及其SPV和PL研究

Investigations on SPV and PL properties of Cu doped TiO_2 nanoparticles prepared by sol-hydrothermal method

采用溶胶-水热法合成掺杂Cu的TiO2纳米粒子,利用XRD,SPS和PL等测试手段对样品进行了表征,重点研究了Cu掺杂对样品表面光电(SPV)和光致发光(PL)性质的影响,并探讨了Cu的作用机制。结果表明,Cu掺杂能够促进TiO2晶型转变,这可能与CuO微晶能够促进金红石成核有关;Cu掺杂使TiO2的SPS和PL信号强度均下降,这可能与Cu2+易于捕获光生电子生成具有全充满结构的Cu+有关。并且掺Cu量越大,SPS和PL信号均下降越显著,但当掺Cu量大于0.5%时,下降缓慢,说明Cu2+捕获光生电子效率接近极限。

The Cu doped TiO2 nanoparticles were prepared by a sol -- hydrothermal process, and also were characterized by XRD, SPS and PL. The effects of Cu dopant on surface photovohage and photoluminescence performance of TiO2 nanoparticles were investigated principally, and the modification mechanism of Cu dopant was also discussed in details. The results showed that Cu dopant could promote the phase transformation of TiO2, which was probably attributed to CuO crystallite being favorable for the production and growth of futile. The intensities of SPS and PL responses of TiO2 decreased after Cu was doped, which was possibly due to the reasons that Cu^2＋ easily captured photoelectrons to form Cu^＋ with a full - filled structure, and the signals of SPS and PL remarkably decreased as Cu dopant content increased, however, the decrease in the intensity of PL and SPS signals became small when the content of Cu dopant was more than 0. 5%, indicating the efficiency of Cu dopant for capturing photoelectrons was possibly close to its limit.