金属镍掺杂改进纳米TiO2的表面增强拉曼散射性能

通过溶胶-水热法合成纯的和不同量Ni离子掺杂的TiO₂纳米粒子, 将其作为表面增强拉曼散射(SERS)活性基底, 研究了金属Ni掺杂对于纳米TiO₂ SERS性能的改进. 结果表明, 适量的Ni掺杂能够在纳米TiO₂的能隙中靠近导带底的位置形成丰富的掺杂能级, 促进TiO₂-to-molecule的电荷转移过程, 进而提高纳米TiO₂基底对吸附分子的SERS增强能力, 显著改进纳米TiO₂的SERS性能.

Improvement of Surface-enhanced Raman Scattering Properties of TiO2 Nanoparticles by Metal Ni Doping†

Pure TiO₂ and different amount Ni ions doped TiO₂ nanoparticles were synthesized by a sol-hydrothermal method and served as surface-enhanced Raman scattering(SERS) active substrate. The improvement of SERS properties of TiO₂ nanoparticles by metal Ni doping was mostly investigated. The results indicate that abundant metal doping energy levels can be formed near by the conduction band bottom in the energy gap of TiO₂ by an appropriate amount Ni ions doping, which can promote the TiO₂-to-molecule charge transfer process, and subsequently enhance SERS signals of adsorbed molecule on TiO₂ substrate, and improve remarkably SERS properties of TiO₂ nanoparticles.