Carbon dioxide gas sensor using a graphene sheet

Yoon, Hyeun Joong; Jun, Do Han; Yang, Jin Ho; Zhou, Zhixian; Yang, Sang Sik; Cheng, Mark Ming Cheng

doi:10.1016/j.snb.2011.03.035

Cited by 619 publications

(259 citation statements)

References 22 publications

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“…Exposure to atmospheric environment may significantly alter the electronic properties of graphene and functionality of graphene-based devices due to an additional extrinsic doping [67][68][69], where such common species as water vapor, oxygen, nitrogen and carbon oxides and hydrocarbons act as p-dopants, see e.g., [70][71][72][73][74][75][76][77]. However, high reactivity and instability of many of these dopants make their practical application rather limited [70].…”

Section: Wettability Of Epitaxial Graphene and Effect Of Atmospheric mentioning

confidence: 99%

Epitaxial Graphene and Graphene–Based Devices Studied by Electrical Scanning Probe Microscopy

2013

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Abstract:We present local electrical characterization of epitaxial graphene grown on both Si-and C-faces of 4H-SiC using Electrostatic Force Microscopy and Kelvin Probe Force Microscopy in ambient conditions and at elevated temperatures. These techniques provide a straightforward identification of graphene domains with various thicknesses on the substrate where topographical determination is hindered by adsorbates and SiC terraces. We also use Electrostatic Force Spectroscopy which allows quantitative surface potential measurements with high spatial resolution. Using these techniques, we study evolution of a layer of atmospheric water as a function of temperature, which is accompanied by a significant change of the absolute surface potential difference. We show that the nanoscale wettability of the material is strongly dependent on the number of graphene layers, where hydrophobicity increases with graphene thickness. We also use micron-sized graphene Hall bars with gold electrodes to calibrate work function of the electrically conductive probe and precisely and quantitatively define the work functions for single-and double-layer graphene.

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Section: Wettability Of Epitaxial Graphene and Effect Of Atmospheric mentioning

confidence: 99%

Epitaxial Graphene and Graphene–Based Devices Studied by Electrical Scanning Probe Microscopy

2013

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“…Jeong et al fabricated a flexible NO 2 sensor based on hybrid films based on carbon nanotubes and graphene [14]. Yoon et al reported a CO 2 gas sensor using graphene fabricated by mechanical cleavage [15]. Robinson et al demonstrated the use of reduced graphene oxide to detect chemical-warfare agents and explosives at parts-per-billion concentrations [16].…”

Section: Introductionmentioning

confidence: 99%

Room-Temperature Humidity Sensing Using Graphene Oxide Thin Films

Naik¹,

Krishnaswamy²

2016

Graphene

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In this article, we report on a room-temperature humidity sensing device using graphene oxide (GO) thin films synthesized by chemical exfoliation. Changes in the device conductivity are measured for varying relative humidity in the experimental chamber. Experiments are carried out for relative humidity varying from 30% to 95%. We observe a difference in the results obtained for low relative humidity (<50%) and high relative humidity (>50%), and propose a sensing mechanism to explain this difference. Although the sensor exhibits some hysteresis at high relative humidities, a method to "reset" the sensor is also proposed. The sensing device has high sensitivity and fast response time.

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“…For instance, graphene was used in: (i) nano-electronics (as MOSFET 22 ), (ii) photonics and optoelectronics (ranging from solar cells, LEDs, touch screens, photo-detectors, to ultrafast lasers 23 ), (iii) Spintronics, 24 and (iv) gas sensing. 5,25,26 In this latter application, graphene can be functionalized and reached the stage to compete with the oxides (such as SnO2, TiO2 and ZnO) and to become future leading material in terms of sensitivity and selectivity towards certain gases.…”

Section: Introductionmentioning

confidence: 99%

CO2 adsorption on Fe-doped graphene nanoribbons: First principles electronic transport calculations

et al. 2016

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Decoration of graphene with metals and metal-oxides is known to be one of the effective methods to enhance gas sensing and catalytic properties of graphene. We use density functional theory in combination with the nonequilibrium Green’s function formalism to study the conductance response of Fe-doped graphene nanoribbons to CO2 gas adsorption. A single Fe atom is either adsorbed on graphene’s surface (aFe-graphene) or it substitutes the carbon atom (sFe-graphene). Metal atom doping reduces the electronic transmission of pristine graphene due to the localization of electronic states near the impurities. The reduction in the transmission is more pronounced in the case of aFe-graphene. In addition, the aFe-graphene is found to be less sensitive to the CO2 molecule attachment as compared to the sFe-graphene system. Pristine graphene is also found to be less sensitive to the molecular adsorption. Since the change in the conductivity is one of the main outputs of sensors, our findings will be useful in developing graphene-based solid-state gas sensors.

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Carbon dioxide gas sensor using a graphene sheet

Cited by 619 publications

References 22 publications

Epitaxial Graphene and Graphene–Based Devices Studied by Electrical Scanning Probe Microscopy

Epitaxial Graphene and Graphene–Based Devices Studied by Electrical Scanning Probe Microscopy

Room-Temperature Humidity Sensing Using Graphene Oxide Thin Films

CO2 adsorption on Fe-doped graphene nanoribbons: First principles electronic transport calculations

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