Chemical sensing with switchable transport channels in graphene grain boundaries

Yasaei, Poya; Kumar, Bijandra; Hantehzadeh, Reza; Kayyalha, Morteza; Baskin, Artem; Repnin, Nikita; Wang, Canhui; Klie, Robert F.; Chen, Yong P.; Král, Petr; Salehi‐Khojin, Amin

doi:10.1038/ncomms5911

Cited by 118 publications

(133 citation statements)

References 35 publications

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“…GB [18][19][20][21][23][24][25][26][27]. The origin of this enhanced resistance has been probed with scanning tunneling spectroscopy (STS), and these measurements have revealed that GBs tend to be n-doped compared to the surrounding grains, such that they act as an electrical potential barrier to charge transport [40,41].…”

Section: Electrical Resistivity Of Individual Gbsmentioning

confidence: 99%

“…Therefore, because of its promise for large-area electronic applications, a detailed understanding of the electrical transport properties of polycrystalline graphene is crucial. To this end, a great deal of experimental [13,[18][19][20][21][22][23][24][25][26][27] and theoretical [7,[28][29][30][31][32][33][34][35][36][37][38] effort has has been devoted to studying charge transport across individual graphene GBs, and several reviews have already discussed this topic in great detail [5,26,39]. Therefore, here we briefly summarize the main features of electrical transport across individual graphene GBs before shifting our focus to a more global perspective of charge transport in polycrystalline graphene.…”

Section: Charge Transport In Polycrystalline Graphenementioning

confidence: 99%

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Scaling properties of polycrystalline graphene: a review

et al. 2016

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We present an overview of the electrical, mechanical, and thermal properties of polycrystalline graphene. Most global properties of this material, such as the charge mobility, thermal conductivity, or Young's modulus, are sensitive to its microstructure, for instance the grain size and the presence of line or point defects. Both the local and global features of polycrystalline graphene have been investigated by a variety of simulations and experimental measurements. In this review, we summarize the properties of polycrystalline graphene, and by establishing a perspective on how the microstructure impacts its large-scale physical properties, we aim to provide guidance for further optimization and improvement of applications based on this material, such as flexible and wearable electronics, and high-frequency or spintronic devices.

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Section: Electrical Resistivity Of Individual Gbsmentioning

confidence: 99%

Section: Charge Transport In Polycrystalline Graphenementioning

confidence: 99%

Scaling properties of polycrystalline graphene: a review

et al. 2016

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“…There is also strong scientific interest in graphene GBs due to their onedimensional nature. Some examples include a bimodal phonon scattering behaviour across graphene GBs 7 , anomalous strength characteristics 3,8 , strong chemical sensitivity of boundary charge transform 9 , a transformation of the GBs from transparency of charge carriers to near-perfect reflection 10 , amongst others. A large number of theoretical studies on graphene GB structures have been performed by many researchers .…”

Section: Introductionmentioning

confidence: 99%

Large-scale experimental and theoretical study of graphene grain boundary structures

et al. 2015

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We have characterized the structure of 176 different single-layer graphene grain boundaries grown with chemical vapor deposition using >1000 experimental HRTEM images using a semi-automated structure processing routine. We introduce a new algorithm for generating grain boundary structures for a class of hexagonal 2D materials and use this algorithm and molecular dynamics to simulate the structure of >79 000 linear graphene grain boundaries covering 4122 unique orientations distributed over the entire parameter space. The dislocation content and structural properties are extracted from all experimental and simulated boundaries, and various trends are explored. We find excellent agreement between the simulated and experimentally observed grain boundaries. Our analysis demonstrates the power of a statistically significant number of measurements as opposed to a small number of observations in atomic science. All experimental and simulated boundary structures are available online.

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“…In polycrystalline graphene, the grain boundaries (GBs) between misoriented grains consist of a series of non-hexagonal rings [16][17][18] that can impede charge transport through the material [19][20][21] . In addition, GBs tend to be more chemically reactive than pristine graphene, which can also strongly impact charge transport, making this material interesting for gas sensing applications 22,23 . Prior studies have examined the impact of hydrogenation on the electronic transport properties of polycrystalline graphene 9,24 , but the detailed nature of the interaction between GBs and hydrogen adsorbates remains unclear.…”

Section: Since Its Experimental Isolation In 2004mentioning

confidence: 99%

Grain boundary-induced variability of charge transport in hydrogenated polycrystalline graphene

Vargas¹,

Falkenberg²,

Soriano³

et al. 2017

2D Mater.

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Chemical functionalization has proven to be a promising means of tailoring the unique properties of graphene. For example, hydrogenation can yield a variety of interesting effects, including a metal-insulator transition or the formation of localized magnetic moments. Meanwhile, graphene grown by chemical vapor deposition is the most suitable for large-scale production, but the resulting material tends to be polycrystalline. Up to now there has been relatively little focus on how chemical functionalization, and hydrogenation in particular, impacts the properties of polycrystalline graphene. In this work, we use numerical simulations to study the electrical properties of hydrogenated polycrystalline graphene. We find a strong correlation between the spatial distribution of the hydrogen adsorbates and the charge transport properties. When the hydrogen is confined to the grain boundaries there is little impact on charge transport, while a uniform distribution of hydrogen yields a significant degradation of the electronic mobility. This difference is related to the resonant impurity states induced by the hydrogen adsorbates; these states can form when the hydrogen is in the pristine graphene grains, but not when the hydrogen is within the grain boundary. These results suggest that one can tune the electrical transport of polycrystalline graphene through selective hydrogen functionalization, and they also have important implications for hydrogeninduced magnetization and spin lifetime of this material.

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Chemical sensing with switchable transport channels in graphene grain boundaries

Cited by 118 publications

References 35 publications

Scaling properties of polycrystalline graphene: a review

Scaling properties of polycrystalline graphene: a review

Large-scale experimental and theoretical study of graphene grain boundary structures

Grain boundary-induced variability of charge transport in hydrogenated polycrystalline graphene

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