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

doi:10.1016/j.cjche.2017.05.020

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 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 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

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

Haijuan Zhang, Rong An, Xinghong Ji, Yihui Dong, Fan Pan, Chang Liu, Xiaohua Lu. Effects of nitrogen doping on surface-enhanced Raman scattering (SERS) performance of bicrystalline TiO₂ nanofibres[J]. Chin.J.Chem.Eng., 2018, 26(3): 642-647.

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

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

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