| Pressure mediated doping in graphene. | |
| | |
MedLine Citation:
|
PMID: 21805986 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
|
Exfoliated graphene and few layer graphene samples supported on SiO2 have been studied by Raman spectroscopy at high pressure. For samples immersed on a alcohol mixture, an electron transfer of dn/dP~8 x10^12 cm-2 GPa-1 is observed for monolayer and bilayer graphene, leading to giant doping values of n~6 x10^13 cm-2 at the maximum pressure of 7 GPa, i.e., beyond the Dirac conical approximation. Three independent and consistent proofs of the doping process are obtained from: i) the evolution of the Raman G-band to 2D-band intensity ratio, ii) the pressure coefficient of the G-band frequency and iii) the 2D-band components splitting in the case of the bilayer sample. The charge transfer phenomena is absent for trilayer samples and for samples immersed in Argon or Nitrogen. We also show that a phase transition from a 2D biaxial strain response - resulting from the substrate drag upon volume reduction- to a 3D hydrostatic compression takes place when going from the bilayer to the trilayer sample. By model calculations we relate this transition to the unbinding of the graphene-SiO2 system when increasing the number of graphene layers and as function of the surface roughness parameters. We propose that the formation of silanol groups on the SiO2 substrate allows for a capacitance induced substrate mediated charge transfer. |
| | |
Authors:
|
Jimmy Nicolle; Denis Machon; Philippe Poncharal; Olivier Pierre-Louis; Alfonso San-Miguel |
Related Documents
:
|
9821566 - Predictability, controllability, and fear of symptoms of anxiety in epinephrine-induced... 9666156 - The effects of prior chronic stress on cardiovascular responses to acute restraint and ... 6482466 - Myocardial stress equations: fiberstresses of the prolate spheroid. 15385366 - The influence of acupressure on the monitoring of acoustic evoked potentials in unsedat... 11989826 - Long-term effects of pneumatic dilatation on symptoms and lower oesophageal sphincter p... 8947576 - Pressure effects on the structure of oligomeric proteins prior to subunit dissociation. |
Publication Detail:
|
Type: JOURNAL ARTICLE Date: 2011-8-1 |
Journal Detail:
|
Title: Nano letters Volume: - ISSN: 1530-6992 ISO Abbreviation: - Publication Date: 2011 Aug |
Date Detail:
|
Created Date: 2011-8-2 Completed Date: - Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 101088070 Medline TA: Nano Lett Country: - |
Other Details:
|
Languages: ENG Pagination: - Citation Subset: - |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
|
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Electronic excited states in bilayer graphene double quantum dots.
Next Document: Anomalous Aharonov--Bohm gap oscillations in carbon nanotubes.