TY  - JOUR
PY  - 2021//
TI  - A chemiresistive methane sensor
JO  - Proceedings of the National Academy of Sciences of the United States of America
A1  - Bezdek, Máté J.
A1  - Luo, Shao-Xiong Lennon
A1  - Ku, Kang Hee
A1  - Swager, Timothy M.
SP  - e2022515118
EP  - e2022515118
VL  - 118
IS  - 2
N2  - 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>
LA  - en
SN  - 0027-8424
UR  - http://dx.doi.org/10.1073/pnas.2022515118
ID  - ref1
ER  -