Author/Authors :
Liu، نويسنده , , Yan Jun and Shi، نويسنده , , Jinjie and Zhang، نويسنده , , Dian Fan •
Litao Liang، نويسنده , , Huinan and Xu، نويسنده , , Jian and Lakhtakia، نويسنده , , Akhlesh and Fonash، نويسنده , , Stephen J. and Huang، نويسنده , , Tony Jun، نويسنده ,
Abstract :
A high-speed humidity sensor based on a nanostructured chiral sculptured thin film (CSTF) was fabricated and tested. The sensing principle is based on the shift of the central wavelength of the circular Bragg regime of the CSTF caused by adsorption and desorption of water vapor in the void regions of the CSTF. Spectral changes due to varying relative-humidity (RH) levels in the ambient environment were measured by a spectrometer. The CSTF sensor exhibited excellent reversibility and reproducibility from 40% to 100% RH. Moreover, the adsorption time of the sensor was measured to be as low as ∼140 ms, making it promising for many high-speed humidity-sensing applications.
Keywords :
high speed , Nanowire , Humidity sensor , Sculptured Thin Films , Circular Bragg regime
