SCI和EI收录∣中国化工学会会刊

Chin.J.Chem.Eng. ›› 2018, Vol. 26 ›› Issue (3): 642-647.DOI: 10.1016/j.cjche.2017.05.020

• Materials and Product Engineering • Previous Articles     Next Articles

Effects of nitrogen doping on surface-enhanced Raman scattering (SERS) performance of bicrystalline TiO2 nanofibres

Haijuan Zhang1, Rong An2, Xinghong Ji1, Yihui Dong1, Fan Pan1, Chang Liu1, Xiaohua Lu1   

  1. 1 College of Chemistry and Chemical Engineering, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing 210009, China;
    2 Herbert Gleiter Institute of Nanoscience, Nanjing University of Science and Technology, No. 200, Xiaolingwei, Nanjing 210094, China
  • Received:2017-03-21 Revised:2017-05-26 Online:2018-04-18 Published:2018-03-28
  • Contact: Chang Liu
  • Supported by:

    Supported by Chinese MOST 973 project (2013CB733501), the National Natural Science Foundation of China1 (21136004, 21476106, 21606131), the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), and the Fundamental Research Funds for the Central Universities (30916011351) at Nanjing University of Science & Technology

Effects of nitrogen doping on surface-enhanced Raman scattering (SERS) performance of bicrystalline TiO2 nanofibres

Haijuan Zhang1, Rong An2, Xinghong Ji1, Yihui Dong1, Fan Pan1, Chang Liu1, Xiaohua Lu1   

  1. 1 College of Chemistry and Chemical Engineering, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing 210009, China;
    2 Herbert Gleiter Institute of Nanoscience, Nanjing University of Science and Technology, No. 200, Xiaolingwei, Nanjing 210094, China
  • 通讯作者: Chang Liu
  • 基金资助:

    Supported by Chinese MOST 973 project (2013CB733501), the National Natural Science Foundation of China1 (21136004, 21476106, 21606131), the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), and the Fundamental Research Funds for the Central Universities (30916011351) at Nanjing University of Science & Technology

Abstract: In this work, we successfully synthesized bicrystalline anatase/TiO2(B) nanofibre and used it as active substrate for surface-enhanced Raman scattering (SERS) applications. The bicrystalline structured TiO2 substrates provide additional charge transfer across the anatase-TiO2(B) interface and thus enhanced activity compared to the pure single crystalline phase. With an effort to further increase the sensitivity of SERS, nitrogen element was doped into bicrystalline anatase/TiO2(B) nanofibres (N-TiO2) and higher SERS enhancement was achieved. The nitrogen content was controlled by tuning the calcination temperature of titanate precursor at 500, 600 and 700℃, respectively. The sample calcined at 600℃ (NT600) acquires the highest percentage of nitrogen element due to its open pore structure that facilitates the diffusion of nitrogen during calcination. Raman intensity depends on the amount of nitrogen doping, thus NT600 exhibited the best SERS activity. The doped nitrogen in TiO2 facilitates the charge transfer between TiO2 and probing molecules and thus suppresses the electron-hole recombination. This work provides a new perspective on the design of efficient TiO2 SERS active substrate and is expected to be valuable for adsorbate detection on semiconductor surface.

Key words: Bicrystalline, Anatase/TiO2(B), Nitrogen-doped TiO2, SERS, Charge-transfer

摘要: In this work, we successfully synthesized bicrystalline anatase/TiO2(B) nanofibre and used it as active substrate for surface-enhanced Raman scattering (SERS) applications. The bicrystalline structured TiO2 substrates provide additional charge transfer across the anatase-TiO2(B) interface and thus enhanced activity compared to the pure single crystalline phase. With an effort to further increase the sensitivity of SERS, nitrogen element was doped into bicrystalline anatase/TiO2(B) nanofibres (N-TiO2) and higher SERS enhancement was achieved. The nitrogen content was controlled by tuning the calcination temperature of titanate precursor at 500, 600 and 700℃, respectively. The sample calcined at 600℃ (NT600) acquires the highest percentage of nitrogen element due to its open pore structure that facilitates the diffusion of nitrogen during calcination. Raman intensity depends on the amount of nitrogen doping, thus NT600 exhibited the best SERS activity. The doped nitrogen in TiO2 facilitates the charge transfer between TiO2 and probing molecules and thus suppresses the electron-hole recombination. This work provides a new perspective on the design of efficient TiO2 SERS active substrate and is expected to be valuable for adsorbate detection on semiconductor surface.

关键词: Bicrystalline, Anatase/TiO2(B), Nitrogen-doped TiO2, SERS, Charge-transfer