Highly Sensitive and Selective NiO Film / K+ -Exchanged Glass Composite Optical Waveguide Sensor for Chlorobenzene Vapor Detection

Abstract

In this paper, we propose a new and simple NiO-based Chlorobenzene vapor optical waveguide (OWG) sensor. The highly sensitive element of this sensor was made by coating the nickel oxide film over a single-mode potassium ion (K+) exchanged glass OWG. Sensitivity of the NiO film composite OWG sensor was estimated by the change of absorption properties of the film. The sensor has a linear response to Chlorobenzene concentration, and sensitivity up to 1.8ppm. Moreover, it shows a satisfactory repeatability and a low sensitivity to common interfering gases such as benzene, toluene, xylene and ethanol vapors.