Fabrication and Formaldehyde-Sensing Property of Quartz Crystal Microbalance (QCM) Coated with PVP-MWCNTs Composites

Abstract:

In this paper, the quartz crystal microbalance (QCM) sensors coated with polyvinyl pyrrolidone (PVP)-multiwalled carbon nanotubes (MCWNTs) nanocomposite thin films were developed by the spray process, which were used for the detection of low concentration formaldehyde at room temperature. The surface morphology and structure of films was analyzed by scanning electron microscope (SEM), UV-Vis absorption spectrometry, respectively, and the formaldehyde-sensing properties of sensors were investigated. The results showed that the prepared QCM gas sensor exhibited the linear characteristic, fast response, good reproducibility to low concentration formaldehyde within 6 ppm, and the poisoning of films was observed when the formaldehyde concentration exceeded 6ppm. Moreover, the sensitivity of the sensor could achieve up to 1Hz/ppm and had the good stability of response values.

• Periodical: Key Engineering Materials (Volumes 645-646)
• Pages: 719-723
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.645-646.719
• Online since: May 2015
• Authors: Ying Fei He, Ya Dong Jiang, Hui Ling Tai*, Guang Zhong Xie
• Keywords: Formaldehyde, Multiwalled Carbon Nanotubes (MCWNTs), Polyvinyl Pyrrolidone (PVP), Quartz Crystal Microbalance (QCM), Sensors

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