AUTHOR=Wang Beibei , Zhou Lingling , Wang Xiaoqian 

TITLE=Surface acoustic wave sensor for formaldehyde gas detection using the multi-source spray-deposited graphene/PMMA composite film

JOURNAL=Frontiers in Materials

VOLUME=9

YEAR=2023

URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2022.1025903

DOI=10.3389/fmats.2022.1025903

ISSN=2296-8016

ABSTRACT=<p>A surface acoustic wave (SAW) formaldehyde sensor based on a graphene/polymethyl methacrylate (PMMA) composite film with high sensitivity, and short response and recovery time was proposed in this study. Using a novel multi-source spray deposition method, graphene sheets were uniformly dispersed in a PMMA film to fabricate sensitive films with a three-dimensional framework structure for use in SAW devices. The formaldehyde-sensing ability was enhanced by optimizing the film thickness and operating temperature. The highest performance was achieved for a graphene/PPMA film thickness of 2.2 μm at a temperature of 120°C.</p>