Effects of Co doping on the phase transformation and optical properties of TiO 2 thin films by solgel method

Jianjun Tian; Hongmei Deng; Lin Sun; Hui Kong; Pingxiong Yang; Junhao Chu

doi:10.1016/j.physe.2011.09.020

Effects of Co doping on the phase transformation and optical properties of TiO ₂ thin films by solgel method

Jianjun Tian, Hongmei Deng, Lin Sun, Hui Kong, Pingxiong Yang, Junhao Chu

School of Physics and Electronic Science

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

The influences of Co doping on the anatase-to-rutile transformation of TiO ₂ thin films have been investigated by Raman spectroscopy and X-ray diffraction. Raman spectra and XRD patterns for the samples of various Co concentrations present a clear evolution of TiO ₂ with different anatase-to-rutile ratios. The fraction of rutile phase increases gradually with increasing Co contents. When Co content exceeds 7 mol%, anatase phase is not detected in the samples. The results may be related to the oxygen vacancies, which are introduced by Co doping. According to the Adachi model, optical constant was extracted by spectroscopic ellipsometry. It is found that the refractive index n increases with increasing Co content from 2.29 to 2.4, and that the optical band gap decreases and varies with increment of Co content between 3.6 and 3.38 eV. This may be related to the changes in film density and band gap tailed due to the Co doping.

Original language	English
Pages (from-to)	550-554
Number of pages	5
Journal	Physica E: Low-Dimensional Systems and Nanostructures
Volume	44
Issue number	3
DOIs	https://doi.org/10.1016/j.physe.2011.09.020
State	Published - Dec 2011

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title = "Effects of Co doping on the phase transformation and optical properties of TiO 2 thin films by solgel method",

abstract = "The influences of Co doping on the anatase-to-rutile transformation of TiO 2 thin films have been investigated by Raman spectroscopy and X-ray diffraction. Raman spectra and XRD patterns for the samples of various Co concentrations present a clear evolution of TiO 2 with different anatase-to-rutile ratios. The fraction of rutile phase increases gradually with increasing Co contents. When Co content exceeds 7 mol\%, anatase phase is not detected in the samples. The results may be related to the oxygen vacancies, which are introduced by Co doping. According to the Adachi model, optical constant was extracted by spectroscopic ellipsometry. It is found that the refractive index n increases with increasing Co content from 2.29 to 2.4, and that the optical band gap decreases and varies with increment of Co content between 3.6 and 3.38 eV. This may be related to the changes in film density and band gap tailed due to the Co doping.",

author = "Jianjun Tian and Hongmei Deng and Lin Sun and Hui Kong and Pingxiong Yang and Junhao Chu",

year = "2011",

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doi = "10.1016/j.physe.2011.09.020",

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T1 - Effects of Co doping on the phase transformation and optical properties of TiO 2 thin films by solgel method

AU - Tian, Jianjun

AU - Deng, Hongmei

AU - Sun, Lin

AU - Kong, Hui

AU - Yang, Pingxiong

AU - Chu, Junhao

PY - 2011/12

Y1 - 2011/12

N2 - The influences of Co doping on the anatase-to-rutile transformation of TiO 2 thin films have been investigated by Raman spectroscopy and X-ray diffraction. Raman spectra and XRD patterns for the samples of various Co concentrations present a clear evolution of TiO 2 with different anatase-to-rutile ratios. The fraction of rutile phase increases gradually with increasing Co contents. When Co content exceeds 7 mol%, anatase phase is not detected in the samples. The results may be related to the oxygen vacancies, which are introduced by Co doping. According to the Adachi model, optical constant was extracted by spectroscopic ellipsometry. It is found that the refractive index n increases with increasing Co content from 2.29 to 2.4, and that the optical band gap decreases and varies with increment of Co content between 3.6 and 3.38 eV. This may be related to the changes in film density and band gap tailed due to the Co doping.

AB - The influences of Co doping on the anatase-to-rutile transformation of TiO 2 thin films have been investigated by Raman spectroscopy and X-ray diffraction. Raman spectra and XRD patterns for the samples of various Co concentrations present a clear evolution of TiO 2 with different anatase-to-rutile ratios. The fraction of rutile phase increases gradually with increasing Co contents. When Co content exceeds 7 mol%, anatase phase is not detected in the samples. The results may be related to the oxygen vacancies, which are introduced by Co doping. According to the Adachi model, optical constant was extracted by spectroscopic ellipsometry. It is found that the refractive index n increases with increasing Co content from 2.29 to 2.4, and that the optical band gap decreases and varies with increment of Co content between 3.6 and 3.38 eV. This may be related to the changes in film density and band gap tailed due to the Co doping.

UR - https://www.scopus.com/pages/publications/84355162919

U2 - 10.1016/j.physe.2011.09.020

DO - 10.1016/j.physe.2011.09.020

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VL - 44

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JO - Physica E: Low-Dimensional Systems and Nanostructures

JF - Physica E: Low-Dimensional Systems and Nanostructures

IS - 3

ER -

Effects of Co doping on the phase transformation and optical properties of TiO ₂ thin films by solgel method

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