Ultrasensitive SO2 gas sensor based on protonized guanidine-CNT vdW heterostructure
Sulfur dioxide(SO2)is a hazardous air pollutant with significant implications for the environment and human health.Traditional detection methods for SO2 are challenged by limitations such as poor specificity and high operational costs.This study introduces an innovative approach for SO2 detection using chemiresistive sensors composed of single-walled carbon nanotubes(SWCNTs)and 1,8-bis(tetramethyl-guanidino)naphthalene with highly active protonized guanidino ionic groups through vdW interface heterostructure.This carbon nanotube composite sensing film serves as the core to construct a chemiresistive gas sensor,the developed sensors demonstrate a low detection limit of 12.8 ppb for SO2 at room temperature along with high specificity to common gases such as NO2 and CO2,offering a cost-effective,highly sensitive,and specific solution for SO2 detection.
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