title: Vapor trace recognition using a single nonspecific chemiresistor.
abstract: 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.
authors.affiliation: Department of Physics and Astronomy, Western Kentucky University, Bowling Green, KY 42101, USA. vladimir.dobrokhotov@wku.edu
authors.forename: Vladimir
authors.initials: V
authors.lastname: Dobrokhotov
authors.forename: Alexander
authors.initials: A
authors.lastname: Larin
authors.forename: Dewayne
authors.initials: D
authors.lastname: Sowell
mesh_terms: D000465:Algorithms; D003217:Conductometry / Q000295:instrumentation*; D016002:Discriminant Analysis; D017097:Electric Impedance; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005740:Gases / Q000032:analysis*; D008832:Microchemistry / Q000295:instrumentation*; D010363:Pattern Recognition, Automated / Q000379:methods*; D014159:Transducers
chemical_list: D005740:Gases