摘要
本文采用溶胶-水热法制备了TiO2及Cu掺杂的TiO2纳米粒子作为表面增强拉曼光谱(SERS)活性基底,观察到当4-巯基苯甲酸吸附在3%Cu掺杂的TiO2表面上时,其SERS信号得到了最大程度的增强.Cu离子掺杂进TiO2晶格时会使TiO2表面的缺陷浓度(表面态)得到增加,一定量的缺陷浓度对TiO2-to-Molecule的电荷转移机理起到促进作用,进一步证明了化学增强机理在SERS现象的贡献.
A series of Cu-doped TiO2（Cu-TiO2） nanoparticles（NPs） have been synthesized for the application as surface-enhanced Raman scattering（SERS） substrates.Significant SERS signals were observed when the probing molecules of 4-mercaptobenzoic acid were adsorbed on the surface of these substrates.Transmission electron microscopy（TEM）,UV-vis spectrophotometer,X-ray Diffraction（XRD） and X-ray photoelectron spectroscopy（XPS） have been employed to investigate the TiO2 and Cu-TiO2 nanaoparticles.The crystalline defects of the Cu-TiO2 NPs caused by Cu dopants affected the SERS activity.In these defect areas,the electrons transfer from the valance band of TiO2 NPs and then transfers to the surface state energy levels.The inner-particle charge-transfers also contributed to the particle-to-molecule charge-transfers,which played a very important role in the enhancements of SERS signals.
出处
《中国科学：化学》
CAS
CSCD
北大核心
2011年第2期398-402,共5页
SCIENTIA SINICA Chimica
基金
国家自然科学基金(20873050
20921003
20973074)
教育部引智计划(B06009)的资助
关键词
TIO2
掺杂
SERS
电荷转移
TiO2
dope
surface-enhanced Raman scattering（SERS）
charge-transfer
