title: A Sensor Array for the Detection and Discrimination of Methane and Other Environmental Pollutant Gases.
abstract: We address the sensitive detection and discrimination of gases impacting the environment, such as CH₄, NH₃, SO₂, and CO, using a sensor array and aided by principal component analysis (PCA). A 32-element chemiresistive sensor array consisting of nine different sensor materials including seven types of modified single-walled carbon nanotubes and two types of polymers has been constructed. PCA results demonstrate excellent discriminating ability of the chemiresistor sensor chip in the 1-30 ppm concentration range. The accuracy of the sensor was verified against data collected using cavity ring down spectroscopy. The sensor chip has also been integrated with a smartphone and has been shown to reproduce the sensing performance obtained with the laboratory measurement system.
authors.affiliation: NASA Ames Research Center, Moffett Field, CA 94035, USA. ami.m.hannon@nasa.gov.|Analtyical Mechanics Associates, Inc. at NASA Ames Research Center, Moffett Field, CA 94035, USA. ami.m.hannon@nasa.gov.
authors.forename: Ami
authors.initials: A
authors.lastname: Hannon
authors.affiliation: NASA Ames Research Center, Moffett Field, CA 94035, USA. yijiang.lu-1@nasa.gov.|ELORET Corporation at NASA Ames Research Center, Moffett Field, CA 94035, USA. yijiang.lu-1@nasa.gov.
authors.forename: Yijiang
authors.initials: Y
authors.lastname: Lu
authors.affiliation: NASA Ames Research Center, Moffett Field, CA 94035, USA. jing.li-1@nasa.gov.
authors.forename: Jing
authors.initials: J
authors.lastname: Li
authors.affiliation: NASA Ames Research Center, Moffett Field, CA 94035, USA. m.meyyappan@nasa.gov.
authors.forename: M
authors.initials: M
authors.lastname: Meyyappan
keywords: electronic nose; functionalized nanotubes; gas sensor; principal component analysis; room temperature gas sensing; selective methane sensor; smartphone based sensor