Experimental Sensing and Density Functional Theory Study of H₂S and SOF₂ Adsorption on Au‐Modified Graphene

Abstract

A gas sensor is used to detect SF6 decomposed gases, which are related to insulation faults, to accurately assess the insulated status of electrical equipment. Graphene films (GrF) modified with Au nanoparticles are used as an adsorbent for the detection of H2S and SOF2, which are two characteristic products of SF6 decomposed gases. Sensing experiments are conducted at room temperature. Results demonstrate that Au‐modified GrF yields opposite responses to the tested gases and is thus considered a promising material for developing H2S‐ and SOF2‐selective sensors. The first‐principles approach is applied to simulate the interaction between the gases and Au‐modified GrF systems and to interpret experimental data. The observed opposite resistance responses can be attributed to the charge‐transfer differences related to the interfacial interaction between the gases and systems. The density of states and Mulliken population analysis results confirm the apparent charge transfer in Au‐modified GrF chemisorption, whereas the van der Waals effect dominates the pristine graphene adsorption systems. Calculation results can also explicate the significant SOF2 responses on Au‐modified GrF. This work is important in graphene modulation and device design for selective detection.

Ni-CNT Chemical Sensor for SF6 Decomposition Components Detection: A Combined Experimental and Theoretical Study

“…As shown in Figure 3, the resistance of the gas sensor significantly reduces when it contacts SF 6 decomposition components [26,27,28,29]. The Ni-CNT gas sensor presents a large gas response to SF 6 decomposition components at room temperature and ambient pressure due to the catalytic property of evenly distributed Ni nanoparticles.…”

“…Meanwhile, a TiO 2 -based gas sensor usually needs a high working temperature to receive a high gas response to SF 6 decomposition components. It was reported that the LOD of Au-Graphene was only 50 ppm with a gas response of 18.75% to H 2 S [28]. Therefore, the Ni-CNT sensor obviously presents advantages in high gas response and low working temperature.…”

Comparative Study of Materials to SF6 Decomposition Components

“…To detect, evaluate, and diagnose the insulation status of SF 6 gas insulated equipment using the characteristics of SF 6 decomposition, a series of characteristic SF 6 decomposition components, SOF 2 , SO 2 F 2 , SO 2 , H 2 S, CF 4 , HF, and SF 6 , are detected by gas sensors, including metal functionalized single wall carbon nanotubes (SWCNTs) [1][2][3][4][5][6], TiO 2 nanotubes [7][8][9], and graphene gas sensors [10,11], as shown in Table 1. According to the theoretical calculation results, these three kinds of gas-sensing materials are not sensitive to the background gas SF 6 and decomposition component CF 4 .…”

Investigation of Gas-Sensing Property of Acid-Deposited Polyaniline Thin-Film Sensors for Detecting H2S and SO2

“…Gas sensors under study for on-line monitoring and fault diagnosis of electrical equipment mainly include carbon nanotube gas sensors [12,13], titanium nanotube gas sensors [14,15], as well as graphene gas sensors [16,17]. Some research results related to GIS partial discharge monitoring field have been achieved [18].…”