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Improved surface‐enhanced Raman scattering properties of TiO 2 nanoparticles by Zn dopant
Author(s) -
Yang Libin,
Zhang Yu,
Ruan Weidong,
Zhao Bing,
Xu Weiqing,
Lombardi John R.
Publication year - 2010
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.2511
Subject(s) - dopant , raman spectroscopy , raman scattering , materials science , photoluminescence , doping , nanoparticle , substrate (aquarium) , diffuse reflection , adsorption , chemical engineering , analytical chemistry (journal) , nanotechnology , inorganic chemistry , chemistry , optics , optoelectronics , organic chemistry , oceanography , physics , engineering , geology
In this paper, pure and Zn‐doped TiO 2 nanoparticles (NPs) with various content of Zn were prepared by a sol–hydrothermal method and were employed as active substrates for surface‐enhanced Raman scattering (SERS). On the 3% Zn‐doped TiO 2 substrate, 4‐mercaptobenzoic acid(4‐MBA) molecules exhibit a higher SERS intensity by a factor of 6, as compared with the native enhancement of 4‐MBA adsorbed on undoped TiO 2 NPs. Moreover, the higher SERS activity was still observed on the 3% Zn‐doped TiO 2 NPs at temperature even up to 125 °C. These results indicate that an appropriate amount of Zn doping can improve the SERS performances of TiO 2 SERS‐active substrates. The introduction of Zn dopant can enrich the surface states (defects) of TiO 2 and improve the separation efficiency of photo‐generated charge carriers (electrons and holes) in TiO 2 , according to measurements of X‐ray diffraction, UV‐visible diffuse reflectance spectroscopy, and photoluminescence, which are responsible for the influence of Zn dopant on the improved SERS performances of TiO 2 NPs. Copyright © 2009 John Wiley & Sons, Ltd.