Monolayer graphene doping and strain dynamics induced by thermal treatments in controlled atmosphere

Armano, Angelo; Buscarino, Gianpiero; Cannas, Marco; Gelardi, F. M.; Giannazzo, Filippo; Schilirò, Emanuela; Agnello, S.

doi:10.1016/j.carbon.2017.11.008

Cited by 29 publications

(43 citation statements)

References 55 publications

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“…However, the effectiveness is smaller as compared to O 2 and for similar treatments time a lower content of charge carriers is estimated in the case of CO 2 . Again it is confirmed that oxygen is the best doping molecule for Gr . In addition, by a detailed study of the mean values of doping and strain as a function of treatment time, it is observed that the oxygen treatment is characterized by a double kinetics.…”

Section: Resultsmentioning

confidence: 60%

“…The differences found in the effect of the treatment atmosphere have been further deepened by kinetics studies at 300 °C . In particular, different samples have been treated at some selected atmospheres for increasing time starting from 5 min.…”

Section: Resultsmentioning

confidence: 99%

“…Gr used in this study has been prepared by CVD following a well established procedure starting from CH 4 in gas phase to deposit C atoms on copper substrate . After depositing polymethylmethacrylate (PMMA) on top of obtained Gr, removal of Cu by a bath of FeCl 3 has been carried out.…”

Section: Methodsmentioning

confidence: 99%

“…In this case a Parr reactor model 4651 with 250 mL volume has been employed. In particular, a mixture of water vapor and He at 150 °C and 2 bar of water partial pressure has been obtained . The He has been used to purge the Parr before heating.…”

Section: Methodsmentioning

confidence: 99%

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Graphene‐SiO₂ Interaction from Composites to Doping

Armano

Buscarino

Cannas

et al. 2019

Physica Status Solidi (a)

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An overview of the interaction between monolayer graphene and SiO2 dielectric substrate is reported focusing on the effect this latter has on doping and strain induced by thermal treatments in controlled atmosphere. The disentanglement of strain and doping is highlighted and the comparison with another dielectric substrate of Al2O3 evidences the critical role that the substrate has in the electronic properties of graphene. The reported results pave the way for microelectronic devices based on graphene on dielectrics and for Fermi level tuning in composites of graphene and nanoparticles.

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Section: Resultsmentioning

confidence: 60%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Graphene‐SiO₂ Interaction from Composites to Doping

Armano

Buscarino

Cannas

et al. 2019

Physica Status Solidi (a)

Self Cite

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show abstract

“…The disentanglement of strain and doping effects has been also highlighted implying that the O 2 presence is overwhelming. In the latest reports, a soft thermal doping method on graphene was treated in proper ambiences such as O2 [90,92], N2 [91,93], CO2 [91,93], vacuum controlled atmospheres [91,93] up to 300 °C. By the atmosphere on the p-type doping induced by thermal treatments in O2 gas of graphene on SiO2.…”

Section: Introductionmentioning

confidence: 99%

A Library of Doped-Graphene Images via Transmission Electron Microscopy

Pham

2018

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Much recent work has focused on improving the performance of graphene by various physical and chemical modification approaches. In particular, chemical doping of n-type and p-type dopants through substitutional and surface transfer strategies have been carried out with the aim of electronic and band-gap tuning. In this field, the visualization of (i) The intrinsic structure and morphology of graphene layers after doping by various chemical dopants, (ii) the formation of exotic and new chemical bonds at surface/interface between the graphene layers and the dopants is highly desirable. In this short review, recent advances in the study of doped-graphenes and of the n-type and p-type doping techniques through transmission electron microscopy (TEM) analysis and observation at the nanoscale will be addressed.

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Defect Mediated Small Molecular Doping of Graphene

Ragul

Dutta

Ray

2021

Advanced Optical Materials

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It is shown that the improved electrical properties of graphene on organic small‐molecule‐based surface doping is dominated by the doping effect of these materials at the defect sites on graphene. It is hypothesized that this may be due to the healing effect of semi‐bulk substitution‐like doping at the defect sites. In this study, defects are intentionally created with varying densities on graphene by exposing it to trifluoro methane (CHF3) plasma for different time periods. The films are then doped by solution spin coating of bis(trifluoromethane)sulfonamide (TFSA). The measured change in electrical conductivity is proportional to the defect density of the graphene, implying a healing effect of these organic small molecular dopants. First principles calculations are performed to capture this mechanism, and the results conform with the experimental observations. The introduction of defects leads to a modulation of the workfunction while adversely affecting the charge carrier transport properties. It is shown that subsequent TFSA doping aids in healing the defective sites thereby improving conduction while maintaining the changed workfunction. The two processes act in tandem for the enhanced electrical properties of graphene.

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Monolayer graphene doping and strain dynamics induced by thermal treatments in controlled atmosphere

Cited by 29 publications

References 55 publications

Graphene‐SiO₂ Interaction from Composites to Doping

Graphene‐SiO₂ Interaction from Composites to Doping

A Library of Doped-Graphene Images via Transmission Electron Microscopy

Defect Mediated Small Molecular Doping of Graphene

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Monolayer graphene doping and strain dynamics induced by thermal treatments in controlled atmosphere

Cited by 29 publications

References 55 publications

Graphene‐SiO2 Interaction from Composites to Doping

Graphene‐SiO2 Interaction from Composites to Doping

A Library of Doped-Graphene Images via Transmission Electron Microscopy

Defect Mediated Small Molecular Doping of Graphene

Contact Info

Product

Resources

About

Graphene‐SiO₂ Interaction from Composites to Doping

Graphene‐SiO₂ Interaction from Composites to Doping