CRCU

Chemical Research in Chinese Universities ›› 2013, Vol. 29 ›› Issue (4): 751-754.doi: 10.1007/s40242-013-3051-5

• Articles • Previous Articles     Next Articles

SERS Study of Co-doped TiO2 Nanoparticles

XUE Xiang-xin1,2, JI Wei1, MAO Zhu1, LI Zhi-shi1, GUO Zhi-nan1, ZHAO Bing1, ZHAO Chun2   

  1. 1. State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun 130012, P. R. China;
    2. Joint State Key Laboratory on Integrated Optoelectronics, Jilin University, Changchun 130012, P. R. China
  • Received:2013-01-30 Revised:2013-03-04 Online:2013-08-01 Published:2013-07-15
  • Contact: ZHAO Bing E-mail:zhaobing@mail.jlu.edu.cn
  • Supported by:

    Supported by the National Natural Science Foundation of China(Nos.21273091, 21221063), the Specialized Research Fund for the Doctoral Program of Higher Education, China(No.20110061110017), the Program of Introducing Talents of Discipline to Chinese Universities(No.B06009), the Postdoctoral Science Foundation, China(No.2013M530974) and the Development Program of the Science and Technology of Jilin Province, China(No.20110338).

Abstract:

Single-phase Co-doped TiO2(CoxTi1-xO2) nanoparticles(NPs) synthesized via a simple sol-hydrothermal method were used as surface-enhanced Raman scattering(SERS) substrates. Interestingly, it was found that SERS signals were enhanced greatly compared to those of pure TiO2 nanoparticles when an amount of Co2+ ions were doped into the TiO2 lattice. Detailed results clearly show that Co element as Co2+ was incorporated into the TiO2 lattice and the defects were created due to the substitution of Co2+ ions for the Ti4+ ions. The Co2+ doping increases the defect concentration of CoxTi1-xO2 NPs. An amount of defects is beneficial to the charge-transfer so as to increase the SERS activities. A possible mechanism of charge-transfer from CoxTi1-xO2 NPs to molecules was then briefly discussed.

Key words: TiO2, Dope, Defect, Surface-enhanced Raman scattering, Charge-transfer