Microwave Gas Sensor Based on Graphene Aerogels

In this article, the experimental demonstration of a novel microwave gas sensor based on graphene aerogel (GA) is presented. This device makes use highly porous structure in combination with modulation AC conductivity upon exposure to vacuum and ambient air. As proof concept, we integrate GA into rectangular waveguides measure its scattering parameters vector network analyzer (VNA). The characterized by scanning electron microscopy (SEM) four-probe DC measurements. integrated WR-90 custom-designed support wave propagation tested over 8–12 GHz frequency range ( ${X}$ -band). By exposing either air or moderate vacuum, clear shifts waveguide are observed. particular, changes notation="LaTeX">${\approx } {3}$ {1}$ dB transmission reflection obtained, respectively. Moreover, exhibits excellent reproducibility when exposed alternating cycles proving that caused due absorption desorption molecules. These proof-of-concept results pave way for development new class sensors applications such as breath analysis.