@article{ref1,
title="A chemiresistive methane sensor",
journal="Proceedings of the National Academy of Sciences of the United States of America",
year="2021",
author="Bezdek, Máté J. and Luo, Shao-Xiong Lennon and Ku, Kang Hee and Swager, Timothy M.",
volume="118",
number="2",
pages="e2022515118-e2022515118",
abstract="A chemiresistive sensor is described for the detection of methane (CH(4)), a potent greenhouse gas that also poses an explosion hazard in air. The chemiresistor allows  for the low-power, low-cost, and distributed sensing of CH(4) at room temperature in  air with environmental implications for gas leak detection in homes, production  facilities, and pipelines. Specifically, the chemiresistors are based on  single-walled carbon nanotubes (SWCNTs) noncovalently functionalized with  poly(4-vinylpyridine) (P4VP) that enables the incorporation of a  platinum-polyoxometalate (Pt-POM) CH(4) oxidation precatalyst into the sensor by  P4VP coordination. The resulting SWCNT-P4VP-Pt-POM composite showed ppm-level  sensitivity to CH(4) and good stability to air as well as time, wherein the  generation of a high-valent platinum intermediate during CH(4) oxidation is proposed  as the origin of the observed chemiresistive response. The chemiresistor was found  to exhibit selectivity for CH(4) over heavier hydrocarbons such as n-hexane,  benzene, toluene, and o-xylene, as well as gases, including carbon dioxide and  hydrogen. The utility of the sensor in detecting CH(4) using a simple handheld  multimeter was also demonstrated.<p /> <p>Language: en</p>",
language="en",
issn="0027-8424",
doi="10.1073/pnas.2022515118",
url="http://dx.doi.org/10.1073/pnas.2022515118"
}