Gas Sensors

Abstract

The book provides an overview of recent attributes of gas sensors and their applications to a broad audience, including beginners, graduate students, and specialists in both academic and industrial sectors. It contains seven chapters that describe the design, fabrication, different uses, applications, and attributes of gas sensors. The first chapter is related to metal oxide gas sensors such as ZnO and multiwalled carbon nanotubes as well as their composites. It describes the performance of fabricated sensors for sensing NO2, NH3, and CO gases. The second chapter discusses the design of microgas sensors using radiometric phenomena, which occurs due to the temperature difference in rarefied gases. The effects of primary factors and parameters are also described. The third chapter presents terahertz wave propagation in layered media based on waveguide and artificial material configurations to sense gas molecules, especially volatile organic compounds. Improvement in detection sensitivity and selectivity is also discussed with the aid of multilayer microporous polymer structures as a terahertz artificial material to adsorb vapor molecules. The fourth chapter is related to a review of the preparation of ZnO nanorods and their use in ethanol vapor sensing, where the efficiency of 1D ZnO nanostructures prepared by different techniques as a sensing material for gaseous compounds, especially ethanol, is discussed. Ethanol detection characteristics using a ZnO sensor reveals its efficiency in terms of electrical resistance, capacitance, and impedance. The fifth chapter describes the design and fabrication of films based on metal oxide materials for petroleum vaporous compounds...