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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Characterization of nitrogen doped grapheme bilayers synthesized by fast, low temperature microwave plasma-enhanced chemical vapour deposition

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Author(s):
Boas, V, C. R. S. ; Focassio, B. [1] ; Marinho, Jr., E. [1] ; Larrude, D. G. [2] ; Salvadori, M. C. [3] ; Rocha Leao, C. [1] ; dos Santos, D. J. [1]
Total Authors: 7
Affiliation:
[1] Boas, C. R. S., V, Fed Univ ABC, Ctr Engn Modelagem & Ciencias Sociais Aplicadas, BR-09210580 Santo Andre - Brazil
[2] Univ Prebiteriana Mackenzie, Graphene & NanoMat Res Ctr MackGraphe, BR-01302907 Sao Paulo - Brazil
[3] Univ Sao Paulo, Phys Inst, BR-05508090 Sao Paulo - Brazil
Total Affiliations: 3
Document type: Journal article
Source: SCIENTIFIC REPORTS; v. 9, SEP 23 2019.
Web of Science Citations: 1
Abstract

New techniques to manipulate the electronic properties of few layer 2D materials, unveiling new physical phenomena as well as possibilities for new device applications have brought renewed interest to these systems. Therefore, the quest for reproducible methods for the large scale synthesis, as well as the manipulation, characterization and deeper understanding of these structures is a very active field of research. We here report the production of nitrogen doped bilayer graphene in a fast single step (2.5 minutes), at reduced temperatures (760 degrees C) using microwave plasma-enhanced chemical vapor deposition (MW-PECVD). Raman spectroscopy confirmed that nitrogen-doped bilayer structures were produced by this method. XPS analysis showed that we achieved control of the concentration of nitrogen dopants incorporated into the final samples. We have performed state of the art parameter-free simulations to investigate the cause of an unexpected splitting of the XPS signal as the concentration of nitrogen defects increased. We show that this splitting is due to the formation of interlayer bonds mediated by nitrogen defects on the layers of the material. The occurrence of these bonds may result in very specific electronic and mechanical properties of the bilayer structures. (AU)

FAPESP's process: 16/19716-4 - Analyses of the structural and electronic characteristics of defect complexes involving nitrogen in bilayer graphene
Grantee:Bruno Focassio
Support Opportunities: Scholarships in Brazil - Scientific Initiation
FAPESP's process: 12/50259-8 - Graphene: photonics and opto-electronics: UPM-NUS collaboration
Grantee:Antonio Helio de Castro Neto
Support Opportunities: Research Projects - SPEC Program
FAPESP's process: 17/22936-9 - TEMPERATURE MODULATED OPTICAL REFRACTOMETRY: A MOLECULAR PERSPECTIVE ON CURING KINETIC AND PHASE SEPARATION OF LIGNIN-BASED POLYURETHANES
Grantee:Demetrio Jackson dos Santos
Support Opportunities: Regular Research Grants