Potential Application of Laser Reduced Graphene Oxide Electrode for Pressure Sensing

Reduced graphene oxide (rGO) has attracted attention as an active electrode material for flexible electrochemical devices due to the high electric conductivity and large surface area. Compared to the other reduction strategy, laser reduction is a single-step, precise, low-cost, and chemical-free processing that can be directly applied on the graphene oxide (GO) membrane under ambient conditions. In general, the quality of the rGO is limited to that of pristine graphene due to incomplete reduction, and oxygenated defects involved in the reduction process. The partially removed oxygenated functional groups not only influence the impedance of the electrode, but also make it sensitive to the humidity of the working environment. Most of the studies are focused on the laser irradiation parameter optimization to achieve the lowest O/C ratio. This study aims to explore the potential of applying the Laser reduced graphene oxide (LrGO) for pressure sensing. Beyond the laser irradiation parameters including intensity, frequency, and scan speed, the impact of partially reduced GO on the bottom and the interlayer distance increase during the reduction is studied to improve the sensing performance of LrGO. Our results demonstrate the potential of applying LrGO in the pressure sensing field through facile post treatment.