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Chin. Phys. B, 2016, Vol. 25(12): 127103    DOI: 10.1088/1674-1056/25/12/127103
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Identification of surface oxygen vacancy-related phonon-plasmon coupling in TiO2 single crystal

Jun-Hong Guo(郭俊宏)1, Ting-Hui Li(李廷会)2, Fang-Ren Hu(胡芳仁)1, Li-Zhe Liu(刘力哲)3
1. School of Optoelectronic Engineering and Grüenberg Research Center, Nanjing University of Posts and Telecommunicates, Nanjing 210023, China;
2. College of Electronic Engineering, Guangxi Normal University, Guilin 541004, China;
3. Nanjing National Laboratory of Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China
Abstract  

Oxygen vacancies (OVs) play a critical role in the physical properties and applications of titanium dioxide nanostructures, which are widely used in electrochemistry and photo catalysis nowadays. In this work, OVs were artificially introduced in the surface of a pure TiO2 single crystal by pulsed laser irradiation. Raman spectra showed that the intensity of Eg mode was enhanced. Theoretical calculations disclose that this was caused by the strong coupling effect between the phonon vibration and plasmon induced by the OVs-related surface deformation, and good agreement was achieved between the experiments and theory.

Keywords:  luminescent materials      Raman scattering      oxygen vacancies     
Received:  16 August 2016      Published:  05 December 2016
PACS:  71.20.Nr (Semiconductor compounds)  
  78.40.Fy (Semiconductors)  
  78.30.-j (Infrared and Raman spectra)  
Fund: 

Project supported by the National Natural Science Foundation of China (Grant Nos. 61574080, 11404162, 61505085, and 61264008) and the Natural Science Foundation of Jiangsu Province, China (Grant No. BK20130549).

Corresponding Authors:  Fang-Ren Hu, Li-Zhe Liu     E-mail:  hufr@njupt.edu.cn;lzliu@nju.edu.cn

Cite this article: 

Jun-Hong Guo(郭俊宏), Ting-Hui Li(李廷会), Fang-Ren Hu(胡芳仁), Li-Zhe Liu(刘力哲) Identification of surface oxygen vacancy-related phonon-plasmon coupling in TiO2 single crystal 2016 Chin. Phys. B 25 127103

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