期刊
ACS SENSORS
卷 2, 期 10, 页码 1405-1409出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssensors.7b00591
关键词
chemical sensors; gas sensors; chemiresistors; formaldehyde; carbon nanotubes; environmental monitoring
资金
- JSPS KAKENHI [25220602]
- World Premier International (WPl) Research Center Initiative on Materials Nanoarchitectonics (MANA) from Japan Society for the Promotion of Science (JSPS)
We report amperometric detection of formaldehyde (HCHO) using hydroxylamine hydrochloride and single-walled carbon nanotubes (SWCNTs). Hydroxylamine hydrochloride reacts with HCHO to emit HCl vapor, which injects a hole carrier into semiconducting SWCNTs. The increase of conductivity in SWCNTs is easily monitored using an ohmmeter. The debundling of SWCNTs with a metallo-supramolecular polymer (MSP) increased the active surface area in the SWCNTs network, leading to excellent sensitivity to HCHO with a limit of detection (LoD) of 0.016 ppm. The response of sensor is reversible, and the sensor is reusable. The selectivity to HCHO is 10(5)-10(6) times higher than interferences with other volatiles such as water, methanol, and toluene. Moreover, false-positive responses caused by a significant variation of humidity and/or temperature are successfully discriminated from true-positive responses by using two sensors, one with and the other without hydroxylamine hydrochloride, in a referenced system.
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