Sensing of nanoporous 2D materials like r-GO using THz hole arrays

Abstract

Reduced graphene oxide (rGO) and other graphene-based two-dimensional (2D) materials exhibit promising potential across various fields, such as energy storage, solar cells, and sensors. However, concerns regarding the toxic nature of rGO in biomedical applications have been raised. In this study, we investigate the feasibility of utilizing hole arrays as a sensing platform for detecting the presence of rGO through the modulation of surface plasmon resonance (SPR) via extraordinary transmission phenomena (EOT) in the Terahertz (THz) regime. The rGO is prepared using the Hummers method and subsequent reduction of graphene oxide (GO). Characterization of the reduced material is performed using Fouriertransform infrared spectroscopy (FTIR) and X-ray diffraction (XRD), confirming successful reduction. Deposition of rGO on top of hole arrays resulted in changes in SPR frequency, indicating a responsive sensing platform sensitive to changes in rGO thickness. Experimental findings are further verified through numerical simulations. Our study highlights the potential of surface plasmon-based sensing platforms for the detection of rGO using hole arrays in the THz regime.