Effects of nitrogen doping on surface-enhanced Raman scattering(SERS)performance of bicrystalline TiO_2 nanofibres  

作　　者：Haijuan Zhang Rong An Xinghong Ji Yihui Dong Fan Pan Chang Liu Xiaohua Lu 

机构地区：[1]College of Chemistry and Chemical Engineering, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University [2]Herbert Gleiter Institute of Nanoscience, Nanjing University of Science and Technology

出　　处：《Chinese Journal of Chemical Engineering》2018年第3期642-647,共6页中国化学工程学报（英文版）

基　　金：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);the Fundamental Research Funds for the Central Universities(30916011351)at Nanjing University of Science&Technology

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.In this work, we successfully synthesized bicrystalline anatase/TiO_2(B) nanofibre and used it as active substrate for surface-enhanced Raman scattering(SERS) applications. The bicrystalline structured TiO_2 substrates provide additional charge transfer across the anatase-TiO_2(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/TiO_2(B) nanofibres(N-TiO_2) and higher SERS enhancement was achieved. The nitrogen content was controlled by tuning the calcination temperature of titanate precursor at 500, 600 and 700 °C,respectively. The sample calcined at 600 °C(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 TiO_2 facilitates the charge transfer between TiO_2 and probing molecules and thus suppresses the electron–hole recombination. This work provides a new perspective on the design of efficient TiO_2 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 

分 类 号：O657.37[理学—分析化学] TQ343.5[理学—化学]