Alteration of the surface by self-assembled monolayer (SAM) has emerged as the excellent strategy to tune the surface of the materials for interested applications. In this talk, we describe the fabrication of a facile CO2 sensor by selectively modify the outer surface of halloysite nanotues (HNTs) with 3-aminopropyl triethoxysilane SAM. This amine surface functionalized HNTs has been illustrated to selectively capture and release CO2 at low temperature, allowing us to trace the amount of CO2 in the ambient air by electrochemical impedance spectroscopy. We found that the proton conductivity of SAM-modified HNTs in aqueous media was dropped linearly as the concentration of CO2 increase. The results we demonstrate here offer a new path to produce a cheap but reliable CO2 sensor.

Electrochemical sensor of CO2 based on surface modified halloysite nanotubes

255th National Meeting (2018)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.