Graphene aerogel based room temperature chemiresistive detection of hydrogen peroxide: A key explosive ingredient

摘要

A room temperature hydrogen peroxide (H2O2) chemiresistive sensor by employing 3D graphene aerogels is presented in this report. Cost effective one-step hydrothermal method was adopted for the synthesis of perforated 3D Gr-aerogels. For structural and morphological investigations, the synthesized samples were comprehensively characterized using X ray diffraction (XRD), Fourier transform infra-red spectroscopy (FTIR), Raman microscopy, scanning electron microscopy (SEM) and Transmission electron microscopy (TEM) techniques. Brunauer Emmet Teller (BET) studies were carried out for in-depth surface and textural analysis of porous graphene sheets. For H2O2 sensing properties, sensors were fabricated out of synthesized 3D networked graphene nanostructures. Together with, the sensing mechanism had been explained on the basis of change in electrical resistance of synthesized Gr aerogels owing to mutual charge transfer effects between H2O2 and graphene aerogels. According to sensing results, 3D Gr-185 sensor has demonstrated the enhanced sensitivity-selectivity towards H2O2 at room temperature. This enhanced sensor response in Gr-185 has been accredited to presence of active sites of it electrons of aromatic rings, enlarged sp(2) domain size, hole-edge functionalities and combined effects of its high specific surface area, porosity and surface roughness. (C) 2018 Elsevier B.V. All rights reserved.