Chemical vapor sensing properties of graphene based on geometrical evaluation

Hwang, Sukju; Lim, Jin Hong; Park, Hyung Goo; Kim, Whan Kyun; Kim, Duck Hwan; Song, In Sang; Kim, Jae‐Hun; Lee, Seok; Woo, Deok Ha; Jun, Seong Chan

doi:10.1016/j.cap.2011.12.021

Cited by 44 publications

(14 citation statements)

References 24 publications

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“…The opposite happened after access to water vapor and nitrogen dioxide (NO 2 ). In 2012, Hwang et al from Yonsei University studied the response of graphene to NH 3 with different layer number and length-to-width (L/w) ratio [56]. The graphene was prepared from highly oriented pyrolytic graphite (HOPG) through mechanical cleavage.…”

Section: Gas Sensors Based On Pristine Graphenementioning

confidence: 99%

Research Progress of Gas Sensor Based on Graphene and Its Derivatives: A Review

2018

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Featured Application: gas sensors based on graphene and its derivatives have brilliant development prospects on innovating composite material and designing appropriate structure.Abstract: Gas sensors are devices that convert a gas volume fraction into electrical signals, and they are widely used in many fields such as environmental monitoring. Graphene is a new type of two-dimensional crystal material that has many excellent properties including large specific surface area, high conductivity, and high Young's modulus. These features make it ideally suitable for application for gas sensors. In this paper, the main characteristics of gas sensor are firstly introduced, followed by the preparation methods and properties of graphene. In addition, the development process and the state of graphene gas sensors are introduced emphatically in terms of structure and performance of the sensor. The emergence of new candidates including graphene, polymer and metal/metal oxide composite enhances the performance of gas detection significantly. Finally, the clear direction of graphene gas sensors for the future is provided according to the latest research results and trends. It provides direction and ideas for future research.2 of 21 excellent conductivity, and easy adsorption of gas molecules, and the surface can easily be modified by functional groups, so it has good gas sensing properties.Graphene, a monolayer of graphite sheet consisting of sp 2 hybridized carbon atoms covalently bonded to three other atoms which was first isolated by Geim and Novoselov using micro-mechanical peeling of graphite in 2004, so they won the 2010 Nobel Prize in Physics [8]. Graphene is the thinnest and highest strength material in nature at present and has the advantages of strong electric conductivity and heat conductivity, and is almost transparent and dense, thus attracts people's attention [9].Nowadays, there are many studies about graphene gas sensors focused on the performance improvement in the field of composite materials, computational chemistry and Micro-Electro-Mechanical System (MEMS). Considering the practical application of graphene gas sensor, we need to find the most potential direction. In this article, the development process and the state of art of graphene gas sensors are introduced. The direction of graphene gas sensors for the future is also provided. The review provides important reference for follow-up research work. Gas Sensor Key Parameters of Gas SensorGas sensors are the crucial components to detect the type and concentration of gas. The components can transform gas composition, gas concentration and other information from non-electricity to electricity to achieve the measurement of gas [10].The key parameters of gas sensor measuring performance include the following aspects [11]:

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Section: Gas Sensors Based On Pristine Graphenementioning

confidence: 99%

Research Progress of Gas Sensor Based on Graphene and Its Derivatives: A Review

2018

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“…After the seminal discovery of microexfoliated graphene by Geim and Novoselov in 2004, graphene has been suggested as a candidate for chemical sensing with the possibility of detecting individual molecules and charges [1,2]. Due to the extreme surface-to-volume ratio, low intrinsic noise and tenability of the doping level, detected concentrations from hundreds ppm down to ppb have been reached for NO2 and NH3, using exfoliated graphene and reduced graphene oxide [2,3,4]. The availability of large-area graphene by chemical vapor deposition (CVD), has made mass fabricated graphene based sensor devices possible [5,6].…”

Section: Introductionmentioning

confidence: 99%

Large-area nanopatterned graphene for ultrasensitive gas sensing

et al. 2014

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Chemical vapor deposited graphene is nanopatterned by a spherical block-copolymer etch mask. The use of spherical rather than cylindrical block copolymers allows homogeneous patterning of cm-scale areas without any substrate surface treatment. Raman spectroscopy was used to study the controlled generation of point defects in the graphene lattice with increasing etching time, confirming that alongside the nanomesh patterning, the nanopatterned CVD graphene presents a high defect density between the mesh holes. The nanopatterned samples showed sensitivities for NO2 of more than one order of magnitude higher than for non-patterned graphene. NO2 concentrations as low as 300 ppt were detected with an ultimate detection limit of tens of ppt. This is so far the smallest value reported for not UV illuminated graphene chemiresistive NO2 gas sensors. The drastic improvement in the gas sensitivity is believed to be due to the high adsorption site density, thanks to the combination of edge sites and point defect sites. This work opens the possibility of large area fabrication of nanopatterned graphene with extreme density of adsorption sites for sensing applications.

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“…Hwang et al [ 150 ] studied the response of mono-, bi-, and tri-layered graphene sensors to NH 3 . They found out that the number of layers of graphene has no obvious influence on the sensor’s sensitivity.…”

Section: Challenges and Optimization Pathwaysmentioning

confidence: 99%

A Review on Functionalized Graphene Sensors for Detection of Ammonia

Tang

Debliquy

Lahem

et al. 2021

Sensors

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Since the first graphene gas sensor has been reported, functionalized graphene gas sensors have already attracted a lot of research interest due to their potential for high sensitivity, great selectivity, and fast detection of various gases. In this paper, we summarize the recent development and progression of functionalized graphene sensors for ammonia (NH3) detection at room temperature. We review graphene gas sensors functionalized by different materials, including metallic nanoparticles, metal oxides, organic molecules, and conducting polymers. The various sensing mechanism of functionalized graphene gas sensors are explained and compared. Meanwhile, some existing challenges that may hinder the sensor mass production are discussed and several related solutions are proposed. Possible opportunities and perspective applications of the graphene NH3 sensors are also presented.

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Chemical vapor sensing properties of graphene based on geometrical evaluation

Cited by 44 publications

References 24 publications

Research Progress of Gas Sensor Based on Graphene and Its Derivatives: A Review

Research Progress of Gas Sensor Based on Graphene and Its Derivatives: A Review

Large-area nanopatterned graphene for ultrasensitive gas sensing

A Review on Functionalized Graphene Sensors for Detection of Ammonia

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