title: Application of principal component analysis to gas sensing characteristics of Cr0.8Fe0.2NbO4 thick film array.
abstract: The transient changes in resistances of Cr0.8Fe0.2NbO4 thick film sensors towards specified concentrations of H2, NH3, acetonitrile, acetone, alcohol, cyclohexane and petroleum gas at different operating temperatures were recorded. The analyte-specific characteristics such as slopes of the response and retrace curves, area under the curve and sensitivity deduced from the transient curve of the respective analyte gas have been used to construct a data matrix. Principal component analysis (PCA) was applied to this data and the score plot was obtained. Distinguishing one reducing gas from the other is demonstrated based on this approach, which otherwise is not possible by measuring relative changes in conductivity. This methodology is extended for three Cr0.8Fe0.2NbO4 thick film sensor array operated at different temperatures.
authors.affiliation: Materials Chemistry Division, Chemistry Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India. Electronic address: asrm07@igcar.gov.in.
authors.forename: A
authors.initials: A
authors.lastname: Sree Rama Murthy
authors.affiliation: Physics Department, Harish-Chandra Research Institute, Allahabad 211019, India.
authors.forename: Dhruv
authors.initials: D
authors.lastname: Pathak
authors.affiliation: Physics Department, Harish-Chandra Research Institute, Allahabad 211019, India.
authors.forename: Gautam
authors.initials: G
authors.lastname: Sharma
authors.affiliation: Materials Chemistry Division, Chemistry Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India.
authors.forename: K I
authors.initials: KI
authors.lastname: Gnanasekar
authors.affiliation: Materials Chemistry Division, Chemistry Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India.
authors.forename: V
authors.initials: V
authors.lastname: Jayaraman
authors.affiliation: Materials Research Centre, Indian Institute of Science, Bangalore 560012, India.
authors.forename: A M
authors.initials: AM
authors.lastname: Umarji
authors.affiliation: RajaRamanna Fellow, Chemistry Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India.
authors.forename: T
authors.initials: T
authors.lastname: Gnanasekaran
keywords: Cr(0.8)Fe(0.2)NbO(4) thick film; Gas sensors; Principal component analysis; Sensor array