Controlled generation of atomic vacancies in chemical vapor deposited graphene by microwave oxygen plasma

Rozada, R.; Solís‐Fernández, Pablo; Paredes, J.I.; Martı́nez-Alonso, A.; Ago, Hiroki; Tascón, J.M.D.

doi:10.1016/j.carbon.2014.08.015

Cited by 29 publications

(13 citation statements)

References 17 publications

(30 reference statements)

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“…As the treatment time increases, D peak increased considerably accompanied by the appearance of a noticeable D’ peak, while the 2D peak decreased and broadened gradually with the increasing treatment time. The Raman spectrum result indicated that the defect density increased with the treatment time [32,50,51]. This is consistent with the resistance change shown in Figure 6a.…”

Section: Resultssupporting

confidence: 83%

“…First, the oxygen functional groups introduced on the graphene surface provided more effective adsorption sites [30]. Second, the significantly enhanced p -doping level of OP-G and OP-G/G [31,32] increased the average amount of charge transferred from an adsorbed ammonia molecule to the channel. Therefore, the response of the sensors with OP-G and OP-G/G channels are both higher than the sensor with the G channel [33].…”

Section: Resultsmentioning

confidence: 99%

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

Deng³

et al. 2019

Sensors

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Oxygen plasma treatment has been reported as an effective way of improving the response of graphene gas sensors. In this work, a gas sensor based on a composite graphene channel with a layer of pristine graphene (G) at the bottom and an oxygen plasma-treated graphene (OP-G) as a covering layer was reported. The OP-G on top provided oxygen functional groups and serves as the gas molecule grippers, while the as-grown graphene beneath serves as a fast carrier transport path. Thus, the composite channel (OP-G/G) demonstrated significantly improved response in NH3 gas sensing tests compared with the pristine G channel. Moreover, the OP-G/G channel showed faster response and recovering process than the OP-G channel. Since this kind of composite channel is fabricated from chemical vapor deposited graphene and patterned with standard photolithography, the device dimension was much smaller than a gas sensor fabricated from reduced graphene oxide and it is favorable for the integration of a large number of sensing units.

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Section: Resultssupporting

confidence: 83%

Section: Resultsmentioning

confidence: 99%

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

Deng³

et al. 2019

Sensors

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“…Second, in the presence of such high density of defects, the decrease of I D /I G is usually accompanied by a degradation of the second order 2D peak, 51 but this was not observed for our GNRs. Third, in this regime it would be reasonable to expect a significant decrease in conductivity, 52 which was not observed in FET measurements. Lastly, we observed this phenomenon for both 4-NBD and DETA functionalization, which present different mechanisms of functionalization.…”

Section: Behavior Of the I D /I G Ratio For The Functionalized Gnrsmentioning

confidence: 92%

Tunable doping of graphene nanoribbon arrays by chemical functionalization

et al. 2015

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We demonstrate the controlled tuning of the electronic band structure of large-arrays of graphene nanoribbons (GNRs) by chemical functionalization. The GNR arrays are synthesized by substrate-controlled metal-assisted etching of graphene in H2 at high temperature, and functionalized with different molecules. From Raman spectroscopy and carrier transport measurements, we found that 4-nitrobenzenediazonium (4-NBD) and diethylene triamine (DETA) molecules can tune the doping level of the GNR arrays to p- and n-type, respectively. In both cases, the doping effects induced in the GNRs were found to be higher than for a pristine graphene sheet, due to the presence of a large quantity of edges. Effects of chemical doping on the Raman spectrum of sp(2) carbon materials are also discussed. Our findings offer an effective way to control the electronic structure of GNRs by chemical functionalization, and are expected to facilitate the production of nanoribbon-based p-n junctions for future implementation into electronic circuits.

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“…Analogously, nanopores with a narrow PSD can be etched by the generation of a high density of nuclei, followed by a controlled pore expansion. For instance, the oxygen plasma, containing a high concentration of reactive ions and free radicals, can incorporate a high density of nuclei in less than 1 s ( 20 ). By exposing these nuclei to a well-controlled concentration of oxygen atoms for an optimized time and reaction temperature, one can potentially control the pore expansion rate.…”

Section: Introductionmentioning

confidence: 99%

Etching gas-sieving nanopores in single-layer graphene with an angstrom precision for high-performance gas mixture separation

et al. 2019

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Controlled generation of atomic vacancies in chemical vapor deposited graphene by microwave oxygen plasma

Cited by 29 publications

References 17 publications

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

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

Tunable doping of graphene nanoribbon arrays by chemical functionalization

Etching gas-sieving nanopores in single-layer graphene with an angstrom precision for high-performance gas mixture separation

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