A Gas Sensing Channel Composited with Pristine and Oxygen Plasma-Treated Graphene

Wu, Haiyang; Bu, Xiangrui; Deng, Minming; Chen, Guangbing; Zhang, Guohe; Li, Xin; Wang, Xiaoli; Liu, Weihua

doi:10.3390/s19030625

Cited by 17 publications

(6 citation statements)

References 51 publications

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“…With ultrahigh specific surface area, ultrahigh carrier mobility and excellent electrical conductivity, graphene has realized single molecule detection in vacuum [23]. More importantly, graphene-based gas sensor can operate at room temperature with low power consumption [24][25][26][27]. However, perfect graphene is free of dangling bonds and molecule adsorbed on it is through van der Waals force [28], which results in poor selectivity in gas sensing.…”

Section: Introductionmentioning

confidence: 99%

Graphene oxide/graphene hybrid film with ultrahigh ammonia sensing performance

Wu¹,

Liu²,

Bu³

et al. 2020

Nanotechnology

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In this paper, a novel ammonia detection hybrid film is proposed based on a graphene oxide (GO)/graphene stack, which shows excellent sensing characteristics at room temperature. It is attributed to the cooperation of GO layer serving as molecular capture layer while graphene serving as conductive layer. GO layer is obtained on chemical vapor deposited graphene film by a simple drop-casting method. The prepared GO/graphene hybrid film is directly transferred to the target substrate without any additional transfer vehicle to reduce possible contamination. The success of the transfer depends on the mechanical strength of GO layer. The thickness of GO layer can scale down to 55 nm while sustaining the transfer process. The best ammonia gas sensing performance is obtained at about 275 nm GO layer thickness and the ammonia detection limit is calculated to be 1.5 ppb. In conclusion, the ammonia gas sensing performance of GO/graphene hybrid film can be significantly improved through GO layer thickness optimization.

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Section: Introductionmentioning

confidence: 99%

Graphene oxide/graphene hybrid film with ultrahigh ammonia sensing performance

Wu¹,

Liu²,

Bu³

et al. 2020

Nanotechnology

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“…Conventional chemical modification of graphene might provide a variety of possibilities for regulating its chemical and physical properties . Oxygen plasma treatment is a widely used, controllable, and effective experimental method for regulating the surfaces, carrier densities, and electronic structures of graphene-base materials, which could significantly improve the sensitivity and selectivity. − In this paper, the HCHO selective adsorption for the Ag-doped graphene (AgG) and the oxygen plasma-treated AgG (AgOG) has been thoroughly investigated in the framework of the density functional theory. Various interfering gases (CO, NH 3 , CH 4 , C 2 H 2 , C 2 H 4 , CH 3 OH, and CH 3 Cl) on their surfaces have been involved in the simulations.…”

Section: Introductionmentioning

confidence: 99%

Improving the HCHO Sensing Selectivity on Ag-Doped Graphene by Oxygen Functionalization: A First-Principles Study

et al. 2022

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Graphene-based sensors typically fail in the selectivity of target gas detection when exposed to complex and multicompound atmospheres. We have thoroughly compared the adsorptions of various interfering gases (CO, NH 3 , CH 4 , C 2 H 2 , C 2 H 4 , CH 3 OH, and CH 3 Cl) with target HCHO on AgG and AgOG by first-principles simulations. The results demonstrate that AgG shows a poor selectivity for HCHO detection and an oxygen functionalized one can improve the selectivity by enhancing the adsorption strength of HCHO and weakening those of other gas molecules. Moreover, the sensing properties of the AgOG sensors are evaluated by the NEGF method, and the predicted HCHO sensing responses are 76 and 32% along the armchair and zigzag directions, respectively. The present work helps shed some light on designing graphene-based sensing materials with high selectivity.

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“…As these functional groups could provide adsorption sites for gas molecules, GO and rGO have demonstrated their great potential for gas detecting. Recently, we have synthesized an oxygen plasma-treated CVD graphene/intrinsic graphene composite membrane for gas sensing [ 23 ]. The composite film reported in that work exhibited a fast response and recovery process, combining with high sensitivity.…”

Section: Introductionmentioning

confidence: 99%

Improving Ammonia Detecting Performance of Polyaniline Decorated rGO Composite Membrane with GO Doping

Yuan

et al. 2021

Materials

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Gas-sensing performance of graphene-based material has been investigated widely in recent years. Polyaniline (PANI) has been reported as an effective method to improve ammonia gas sensors’ response. A gas sensor based on a composite of rGO film and protic acid doped polyaniline (PA-PANI) with GO doping is reported in this work. GO mainly provides NH3 adsorption sites, and PA-PANI is responsible for charge transfer during the gas-sensing response process. The experimental results indicate that the NH3 gas response of rGO is enhanced significantly by decorating with PA-PANI. Moreover, a small amount of GO mixed with PA-PANI is beneficial to increase the gas response, which showed an improvement of 262.5% at 25 ppm comparing to no GO mixing in PA-PANI.

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A Gas Sensing Channel Composited with Pristine and Oxygen Plasma-Treated Graphene

Cited by 17 publications

References 51 publications

Graphene oxide/graphene hybrid film with ultrahigh ammonia sensing performance

Graphene oxide/graphene hybrid film with ultrahigh ammonia sensing performance

Improving the HCHO Sensing Selectivity on Ag-Doped Graphene by Oxygen Functionalization: A First-Principles Study

Improving Ammonia Detecting Performance of Polyaniline Decorated rGO Composite Membrane with GO Doping

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