A Room-Temperature Operation Formaldehyde Sensing Material Printed Using Blends of Reduced Graphene Oxide and Poly(methyl methacrylate)

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.

Reduced Graphene Oxide-Based Double Network Polymeric Hydrogels for Pressure and Temperature Sensing

“…CMC with amino groups was introduced to reduce hydrophilic GO, and thus improve the conductivity of the hydrogels [ 25 ]. TEM images showed the presence of dark patches after the combination of GO with CMC ( Figure 1 b).…”

Emerging applications driving innovations in gas sensing

“…While few if any of these techniques were aimed specifically at applications in phones or wearables, some have potential for these uses, being small, sensitive and potentially low cost. For example, workers from the National Taiwan University showed that films of RGO mixed with poly(methyl methacrylate) (PMMA) in the ratio 2 per cent RGO:10 per cent PMMA exhibited a resistance change of 30.5 per cent when exposed to 1,000 ppm formaldehyde (Chuang et al, 2015). The sensor operated at room temperature, and the limit of detection was 100 ppm which led to a 1.51 per cent resistance variation.…”

An effective formaldehyde gas sensor based on oxygen-rich three-dimensional graphene

“…Indeed, graphene/metal oxides based composites could improve the sensitivity of formaldehyde sensor because of the electron transfer channels provided by the metal oxide such as SnO [40], SnO 2 [39,41,42], TiO 2 [43][44][45], and ZnO [46][47][48] and ZnSnO 3 [49]. Besides, the graphene has formed composites with polymers [50][51][52], Si nanowires [53] and MoS 2 [54,55] to serve as formaldehydesensing materials. However, the oxygen plasma treated 3D graphene has yet applied in formaldehyde sensing.…”