Epitaxially grown graphene based gas sensors for ultra sensitive NO2 detection

Pearce, Ruth; Iakimov, Tihomir; Andersson, Mike; Hultman, Lars; Spetz, Anita Lloyd; Yakimova, Rositsa

doi:10.1016/j.snb.2010.12.046

Cited by 306 publications

(208 citation statements)

References 24 publications

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“…Furthermore, we assume the freestanding graphene layers have the same in-plane strain as they have on SiC, in order to eliminate all differences that originate in changing the strain. We choose a very dense concentration of molecules, corresponding to one NO 2 molecule on a 2 × 2 graphene sheet, i.e., one NO 2 molecule per eight surface carbon atoms, in order to determine whether or not NO 2 is alone capable of generating the n-p transition observed in graphene [12,14].…”

Section: Methodsmentioning

confidence: 99%

“…Subsequent carbon layers are strongly n doped due to the influence of this carbon buffer layer [9,10,10,11]. There have been several successful experimental studies of using graphene grown on SiC as a NO 2 sensor [3,4,[12][13][14][15][16]. At sufficiently high concentrations of NO 2 , an n to p type shift of the graphene layer was found [4,12,14].…”

Section: Introductionmentioning

confidence: 99%

“…There have been several successful experimental studies of using graphene grown on SiC as a NO 2 sensor [3,4,[12][13][14][15][16]. At sufficiently high concentrations of NO 2 , an n to p type shift of the graphene layer was found [4,12,14]. The influence of the substrate on the sensing capability of the graphene surface has also being investigated experimentally.…”

Section: Introductionmentioning

confidence: 99%

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Changes in work function due to NO2 adsorption on monolayer and bilayer epitaxial graphene on SiC(0001)

et al. 2016

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The electronic properties of monolayer graphene grown epitaxially on SiC(0001) are known to be highly sensitive to the presence of NO 2 molecules. The presence of small areas of bilayer graphene, on the other hand, considerably reduces the overall sensitivity of the surface. We investigate how NO 2 molecules interact with monolayer and bilayer graphene, both free-standing and on a SiC(0001) substrate. We show that it is necessary to explicitly include the effect of the substrate in order to reproduce the experimental results. When monolayer graphene is present on SiC, there is a large charge transfer from the interface between the buffer layer and the SiC substrate to the molecule. As a result, the surface work function increases by 0.9 eV after molecular adsorption. A graphene bilayer is more effective at screening this interfacial charge, and so the charge transfer and change in work function after NO 2 adsorption is much smaller.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Changes in work function due to NO2 adsorption on monolayer and bilayer epitaxial graphene on SiC(0001)

et al. 2016

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“…Up to now, graphene materials were prepared by epitaxial growth (Pearce et al 2011), chemical vapor deposition (Reina et al 2009), mechanical exfoliation (Robinson et al 2008), and thermal or chemical modification (Park and Ruoff 2009). Graphene oxide (GO) has been used for preparing graphene materials.…”

Section: Introductionmentioning

confidence: 99%

The assembly of a composite based on nano-sheet graphene oxide and montmorillonite

Weijia

et al. 2018

Pet. Sci.

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Graphene oxide (GO) nano-sheets were synthesized using a modified Hummers' method from graphite powder. The Raman spectrum of GO displayed a D-band at 1359 cm -1 and a G-band at 1594 cm -1 . The I D /I G value of GO was calculated to be 0.97, suggesting the formation of new sp 2 clusters upon reduction. A method was designed to investigate the assembly of the GO/montmorillonite (MMT) composite. After the addition of GO, the typical peaks of montmorillonite in FT-IR spectra shifted, indicating the assembly between GO and MMT. The D-band and G-band reduced sharply in the GO/MMT composite. More importantly, the D-band (1344 cm -1 ) and G-band (1574 cm -1 ) shifted significantly and the I D / I G value of the GO/MMT composite was calculated to be 1.13, showing a change in the GO structure. In the addition of 0.04 wt% GO to MMT, the value of interlayer space (d) was up to 13.0 Å measured by XRD due to the insertion of GO into MMT. The evident increases in contents of carbon atoms (26.59%) and nitrogen atoms (3.44%) indicate that GO was successfully combined with MMT. The nano-pores and clay sheets were not observed in the SEM image of GO/clay, but obvious wrinkles, while flexible sheets were observed in the typical scanning electron microscopy images of GO. This further proves that GO was combining with clay. The TEM image shows that the GO nano-sheets were tiled on the surface of MMT sheets. This observation suggests that a stable assembly structure was formed between GO sheets and MMT sheets. The change in particle size of MMT with the addition of GO shows that interaction occurred between GO sheets and MMT sheets, which was further confirmed by the results of zeta potential. Adsorption and insertion were the main mechanisms to assemble GO and MMT.

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“…The sensing measurements were carried out as follows: the device was exposed to 60 s pulses of test gas ranging from 40-400 ppm of NO or 100-1000 ppm of CO (one test gas at a time) followed by 120 s pulse of 20% O2 in N2. The normalized sensor response was calculated as the difference in resistance of the device under test gas and that measured in 20% O2 in N2 atmosphere, divided by the latter resistance value, as described elsewhere [28].…”

Section: Device Structure Fabrication and Sensor Measurementsmentioning

confidence: 99%

Electrochemical deposition of gold on indium zirconate (InZrOx with In/Zr atomic ratio 1.0) for high temperature automobile exhaust gas sensors

Afzal

Andersson

Franco

et al. 2015

J Solid State Electrochem

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Epitaxially grown graphene based gas sensors for ultra sensitive NO2 detection

Cited by 306 publications

References 24 publications

Changes in work function due to NO2 adsorption on monolayer and bilayer epitaxial graphene on SiC(0001)

Changes in work function due to NO2 adsorption on monolayer and bilayer epitaxial graphene on SiC(0001)

The assembly of a composite based on nano-sheet graphene oxide and montmorillonite

Electrochemical deposition of gold on indium zirconate (InZrOx with In/Zr atomic ratio 1.0) for high temperature automobile exhaust gas sensors

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