A room temperature NH3 gas sensor based on a quartz crystal microbalance coated with a rGO-SnO2 composite film

Pi-Guey Su; Yu-Xuan Zheng

doi:10.1039/d2ay00283c

A room temperature NH₃ gas sensor based on a quartz crystal microbalance coated with a rGO-SnO₂ composite film

Anal Methods. 2022 Apr 7;14(14):1454-1461. doi: 10.1039/d2ay00283c.

Authors

Pi-Guey Su¹, Yu-Xuan Zheng¹

Affiliation

¹ Department of Chemistry, Chinese Culture University, Taipei 111, Taiwan. spg@ulive.pccu.edu.tw.

PMID: 35332349
DOI: 10.1039/d2ay00283c

Abstract

Novel QCM NH₃ gas sensors made of reduced graphene oxide-SnO₂ (rGO-SnO₂) composite films were fabricated using a one-pot technique, which is a fast and easy fabrication route that is useful for practical applications. The surface morphology and composition of the rGO-SnO₂ composite films were analyzed using Fourier transform infrared spectroscopy, atomic force microscopy, scanning electron microscopy coupled with energy-dispersive X-ray elemental mapping and transmission electron microscopy. On the basis of the microstructural observations, SnO₂ connected to rGO sheets and naked rGO sheets were observed on the surface of the rGO-SnO₂ composite films. The effects of the amount of added rGO sheets on the enhancement of the NH₃ gas sensing properties of the rGO-SnO₂ composite films were studied. The analysis of the adsorption dynamics (association constant) confirmed the higher sensitivity of the QCM NH₃ gas sensor based on the rGO-SnO₂ composite film than that of the sensor with the pristine SnO₂ film.