In this paper, we present a gas sensor for volatile organic compound (VOC) detection based on graphene and poly(methyl methacrylate) (GR/PMMA) composite laminates fabricated using CVD-grown graphene. Graphene was transferred to a poly(ethylene terephthalate) (PET) substrate by PMMA-supported wet transfer process without PMMA removal in order to achieve the deposition of GR/PMMA composite laminates on PET. The GR/PMMA and graphene sensors show completely different sensitivities to VOC vapors. The GR/PMMA and graphene sensors showed the highest sensitivities to dichloromethane (DCM). The response of the GR/PMMA sensor to DCM was 3 times higher than that of the graphene sensor but the GR/PMMA sensor hardly responded to acetone, chloroform, or benzene. The sensing mechanism of the graphene sensor can be based on the dielectric constant of VOCs, the size of VOC molecule, and electron hopping effects on defect graphene, while that of the GR/PMMA sensor can be explained in terms of the polymer swelling owing to the Hansen solubility parameter.
Herein, we describe a simple and cost-effective fabrication of paper-based SERS substrate by coating poly(diallyldimethylammonium chloride) (PDADMAC) and gold nanostar (AuNS) on the filter paper using a vacuum filtration system....
In this study, graphene and poly(methyl methacrylate) (GR/PMMA) composite laminates on flexible substrates were fabricated for the use in volatile organic compounds detection. The CVD-grown graphene on Cu foil was transferred on polyethylene terephthalate (PET) substrate by PMMA-assisted wet transfer process. Without PMMA removal, the GR/PMMA composite laminates on PET were obtained. Graphene and GR/PMMA sensors show completely different sensor response to VOC vapors. The resistance of graphene sensor decreases, while that of GR/PMMA increases upon VOC exposure. The graphene and GR/PMMA sensors show the highest magnitude of sensor response to dichloromethane. The sensor response of the GR/PMMA to acetone, chloroform and benzene are greatly suppressed, resulting in the selectivity improvement. The sensor response of graphene can be explained in terms of the dielectric constant of VOCs and electron hopping effects on defect graphene, while that of the GR/PMMA would be attributed to swelling mechanism.
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