Review of recent trends in gas sensing technologies and their miniaturization potential

Abstract

Purpose – This paper aims to give an overview about the state of the art and novel technologies used in gas sensing. It also discusses the miniaturization potential of some of these technologies in a comparative way. Design/methodology/approach – In this article, the authors state the most of the methods used in gas sensing discuss their advantages and disadvantages and at last the authors discuss the ability of their miniaturization comparing between them in terms of their sensing parameters like sensitivity, selectivity and cost. Findings – In this article, the authors will try to cover most of the important methods used in gas sensing and their recent developments. The authors will also discuss their miniaturization potential trying to find the best candidate among the different types for the aim of miniaturization. Originality/value – In this article, the authors will review most of the methods used in gas sensing and discuss their miniaturization potential delimiting the research to a certain type of technology or application.

An enhanced gas ionization sensor from Y-doped vertically aligned conductive ZnO nanorods

“…Most of the conventional gas sensors are of the chemical type in which chemisorbed target gases on metal oxide [4][5][6][7], silicon [8] and carbon nanotube (CNT) [2,9,10] substrates are quantified by the responses of their electrical [11] or optical property [12]. However, these types of sensors suffer from limited selectivity [11,13] and difficulties in detecting gases with poor adsorption. Normally, a high working temperature is required to establish adsorption/desorption equilibrium [1].…”

Design of Quaternion-Neural-Network-Based Self-Tuning Control Systems

“…In the gas-sensing system, gas sensors with broad and partially overlapping selectivity are used to detect a wide range of gases, and the sensor responses to various gases under modulating gas flow conditions such as flow profile, velocity, temperature, and humidity, are utilized to discriminate gas samples. (21,22) A servo valve is usually used to modulate the gas flow; however, the static and dynamic characteristics of the valve should be compensated by a feedback controller to achieve the gas flow modulation precisely. As the valve has several nonlinear characteristics caused by mechanical and electromagnetic effects: the selftuning PID controller presented in this paper can be applied to the control problem in the gassensing system.…”

New Optical Gas Sensor for Gas Concentration Measurement Using Digital Image Processing

“…Gas sensing methods are wide and diverse due to the several physical and chemical effects that can be measured and reflect the gas characteristics [4]. Sensors like Metal Oxide Semi Conductor (MOS) gas sensors [5] are widely used in commercial sensors.…”