Abstract
This work demonstrates a printable blending material, i.e., reduced graphene oxide (RGO) mixed with poly(methyl methacrylate) (PMMA), for formaldehyde sensing. Based on experimental results, 2% RGO/10% PMMA is an optimal ratio for formaldehyde detection, which produced a 30.5% resistance variation in response to 1000 ppm formaldehyde and high selectivity compared to different volatile organic compounds (VOCs), humidity, CO, and NO. The demonstrated detection limit is 100 ppm with 1.51% resistance variation. Characterization of the developed formaldehyde sensing material was performed by Fourier-transform infrared (FTIR) spectrometry, scanning electron microscopy (SEM), and Raman spectroscopy. Based on Raman spectroscopy, the basic sensing mechanism is the band distortion of RGO due to blending with PMMA and the adsorption of formaldehyde. This work establishes insights into the formaldehyde sensing mechanism and explores a potential printable sensing material for diverse applications.
Highlights
Formaldehyde is one of the most widespread volatile organic compounds (VOCs) in our life
Since the sensing mechanism occurs at the interface of reduced graphene oxide (RGO) and poly(methyl methacrylate) (PMMA), as previously mentioned, the higher composition ratio of PMMA in the RGO/PMMA sensing film leads to less sensing response to formaldehyde
It can be noted that the limit of detection of the developed RGO/PMMA sensor is enough for formaldehyde detection in workspace monitoring, based on our understanding of the sensing mechanism, it could be improved for future applications
Summary
Formaldehyde is one of the most widespread volatile organic compounds (VOCs) in our life. For small-size and real-time monitoring devices, in addition, many microscale gaseous formaldehyde detection systems [15] and various metal oxide semiconductor materials, such as SnO2 [16,17,18], doped ZnO [19,20,21], CdO/In2O3 [22], and nanostructured materials [23] were investigated. These sensing technologies offer good sensitivity to formaldehyde, most of them require bulky and expensive equipment. The sensing properties of printable RGO/PMMA blends for formaldehyde monitoring are further characterized by scanning electron microscopy (SEM), FTIR, and Raman spectroscopy and discussed
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