Chemical and Life Sciences and Engineering Division, King Abdullah University of Science and Technology, Thuwal, Kingdom of Saudi Arabia.
J Am Chem Soc. 2011 Sep 28;133(38):14896-9. doi: 10.1021/ja205997x. Epub 2011 Sep 6.
Titania confined inside carbon nanotubes (CNTs) was synthesized using a restrained hydrolysis method. Raman spectra and magnetic measurements using a SQUID magnetometer suggested the formation of remarkable oxygen vacancies over the encapsulated TiO(2) in comparison with nanoparticles dispersed on the outer surface of CNTs, extending the photoresponse of TiO(2) from the UV to the visible-light region. The CNT-confined TiO(2) exhibited improved visible-light activity in the degradation of methylene blue (MB) relative to the outside titania and commercial P25, which is attributed to the modification of the electronic structure of TiO(2) induced by the unique confinement inside CNTs. These results provide further insight into the effect of confinement within CNTs, and the composites are expected to be promising for applications in visible-light photocatalysis.
使用受限水解法合成了被限制在碳纳米管（CNTs）内部的 TiO2。拉曼光谱和超导量子干涉磁强计（SQUID）的磁测量结果表明，与分散在 CNT 外表面上的纳米颗粒相比，封装在 TiO2 中形成了显著的氧空位，从而将 TiO2 的光响应范围从紫外光扩展到可见光区域。与外表面的 TiO2 和商用 P25 相比，CNT 限制的 TiO2 在亚甲基蓝（MB）的降解中表现出了更好的可见光活性，这归因于 CNT 内部独特限制引起的 TiO2 电子结构的修饰。这些结果进一步深入了解了 CNT 内部限制的影响，预计这些复合材料在可见光光催化应用中具有广阔的应用前景。
