期刊
SENSORS
卷 22, 期 24, 页码 -出版社
MDPI
DOI: 10.3390/s22249939
关键词
quartz crystal microbalance; nanoporous graphene oxide; gas sensor; dual signal; trimethylamine
This paper presents a method using a nanoporous graphene oxide-functionalized quartz crystal microbalance gas sensor for the detection of low-concentration trimethylamine. The sensor exhibits high sensitivity, excellent linearity, and response capability, as well as good repeatability and selectivity towards TMA.
This paper presents a straightforward method to develop a nanoporous graphene oxide (NGO)-functionalized quartz crystal microbalance (QCM) gas sensor for the detection of trimethylamine (TMA), aiming to form a reliable monitoring mechanism strategy for low-concentration TMA that can still cause serious odor nuisance. The synthesized NGO material was characterized by transmission electron microscopy, X-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy to verify its structure and morphology. Compared with the bare and GO-based QCM sensors, the NGO-based QCM sensor exhibited ultra-high sensitivity (65.23 Hz/mu L), excellent linearity (R-2 = 0.98), high response/recovery capability (3 s/20 s) and excellent repeatability (RSD = 0.02, n = 3) toward TMA with frequency shift and resistance. Furthermore, the selectivity of the proposed NGO-based sensor to TMA was verified by analysis of the dual-signal responses. It is also proved that increasing the conductivity did not improve the resistance signal. This work confirms that the proposed NGO-based sensor with dual signals provides a new avenue for TMA sensing, and the sensor is expected to become a potential candidate for gas detection.
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