Abstract
In this study, a simple method for synthesizing graphene layer directly on a quartz crystal microbalance (QCM) using a laser was developed. This laser-induced graphene (LIG) was used for sensing surface to simultaneously measure changes in the adsorbed mass, film stiffness, and electrical resistance during water adsorption. The developed LIG-QCM is convenient because its fabrication process is free of any tedious masking and vacuuming steps. A thin layer of polyimide (PI) film was spin-coated on one side of a quartz crystal microresonator, and interdigitated electrodes (IDE) were patterned on the PI surface using a laser engraver. The adsorption of water molecules on the sensing surface induced changes in mass, stiffness, and electrical conductivity, which were measured from the changes in resonance frequency, Q factor of the quartz crystal, and electrical resistance, respectively. The results indicated that the developed sensor could be a humidity sensing platform using LIG.
Highlights
IntroductionPublisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations
To the best of our knowledge, this study describes the first integration of laser-induced graphene (LIG) patterning and quartz resonator and their application to sensors.and Methods
Changes in mass and film stiffness were measured by the changes in resonance frequency and Q factor from quartz crystal microbalance (QCM), respectively
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Polymers have attracted considerable interest as sensing materials owing to the potential applications in gas chromatography, membranes, and gas sensors because of the interactions between gas and polymer. Gas sensors are widely used to monitor the atmospheric environment or detect hazardous gases [1]. The adsorption of gas molecules onto a polymer surface, a change in mass varies depending on the amount of gas absorbed. The nanostructured or porous polymer films facilitate the diffusion of gas molecules, which shortens the response time of the sensors
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