Vapor Trace Recognition Using a Single Nonspecific Chemiresistor

作者：Vladimir Dobrokhotov, A. V. Larin, Dewayne Sowell · 发表于：Sensors · 年份：2013 · 被引用次数：19 · 研究领域：Advanced Chemical Sensor Technologies、Gas Sensing Nanomaterials and Sensors、Analytical Chemistry and Sensors

An application of spectral analysis to the transient response signals of ALD-fabricated conductometric sensors (chemiresistors) upon exposure to short vapor pulses is discussed. It is based on the representation of a response curve in the frequency domain, followed by the multi-dimensional Quadratic Discriminant Analysis (QDA) for analyte identification. Compared to the standard steady-state amplitude analysis, this technique does not depend on a short-term sensor drift, does not have limitations for the number of extracted features and has a strict physical validation. Effective recognition of some relatively simple combustible analytes (acetone, toluene, ethanol) was demonstrated using a single nonspecific chemiresistor.