Technical Institute of Physics and Chemistry, Chinese Academy of Sciences , 29 Zhongguancun East Road, Haidian District, Beijing 100190, China.
University of the Chinese Academy of Sciences , 19 A Yuquan Rd, Shijingshan District, Beijing 100049, China.
ACS Appl Mater Interfaces. 2017 Aug 30;9(34):28674-28684. doi: 10.1021/acsami.7b10010. Epub 2017 Aug 18.
Face-to-face interfacial assembly of TiO-g-CN hybrid (2D TCN-A) is developed by surfactant-assisted hydrothermal treatment forming a sandwich structure of anatase TiO nanosheets (TiO-A, 5-6 monolayers) and g-CN nanosheets (∼3 monolayers). Post air-annealing is found effective for insertion of oxygen to the hybrid, which remedies the oxygen vacancies of TiO (B) nanosheets and converts it to anatase nanosheets. The enhanced light adsorption, increased donor density, and prolonged life of charge carries are achieved by variation of bandgap and the formation of heterojuction between the two kinds of nanosheets, facilitating separation and transfer of charge carriers. The 2D TCN-A-70 nanosheets show a high photodegradation rate of methyl orange (k ≈ 0.189 min) and photocatalytic evolution rate of hydrogen (18200 μmol g h). This 2D nanosheets hybrid is potentially useful in alleviating environmental and energy issues.
通过表面活性剂辅助水热处理，开发了 TiO-g-CN 杂化（二维 TCN-A）的面对面界面组装，形成锐钛矿 TiO 纳米片（TiO-A，5-6 单层）和 g-CN 纳米片（约 3 单层）的夹层结构。空气退火后发现氧有效插入到杂化体中，这弥补了 TiO（B）纳米片的氧空位，并将其转化为锐钛矿纳米片。通过能带隙的变化和两种纳米片之间异质结的形成，实现了光吸收的增强、施主密度的增加和载流子寿命的延长，从而促进了载流子的分离和转移。二维 TCN-A-70 纳米片对甲基橙（k≈0.189 min）具有高光降解率和光催化析氢率（18200 μmol g h）。这种二维纳米片杂化体在缓解环境和能源问题方面具有潜在的应用价值。
