TiO2纳米线阵列干涉传感器

Abstract

In this work,a new TiO2nanowire array based interferometric sensor had been developed. At first, TiO2nanowire array films were prepared on the surface of conductive FTO glass through hydrothermal synthesis method. Then,a new type of interferometric film sensor based on wavelength modulation was constructed by utilizing the compound structure FTO glass with TiO2nanowire array thin film as the sensing chip and making use of the typical Kretschmann prism coupling structure. Finally,the response performance of the interfero-metric sensor to ambient refractive index was displayed by employing sodium chloride aqueous solution as the measured liquid media. The results show that the sensor has a preferable response to refractive index over the range of 1. 333 5 ~ 1. 360 4. In the case of TM mode,there is a good linear relationship between reflectometric light intensity and NaCl concentration in the range of 0% to 3% and 3% to 15% quality percentage,respectively. For TE mode,within the range of 0 to 3% NaCl concentration,it shows a negative linear relationship between NaCl concentration and the absorption intensity while the resonant wavelength is basically unchanged; within the range of 3 to 15% NaCl concentration,with the increase of NaCl concentration,the resonant wavelength is gradually red shifted and it exhibits a positive linear relationship between NaCl concentration and resonant wavelength.