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Direct electro-deposition of graphene from aqueous suspensions
journal contribution
posted on 2011-01-01, 00:00 authored by Matthias Hilder, B Winther-Jensen, D Li, Maria ForsythMaria Forsyth, D MacFarlaneWe describe the direct electro-chemical reduction of graphene oxide to graphene from aqueous suspension by applying reduction voltages exceeding -1.0 to -1.2 V. The conductivity of the deposition medium is of crucial importance and only values between 4-25 mS cm-1 result in deposition. Above 25 mS cm-1 the suspension de-stabilises while conductivities below 4 mS cm-1 do not show a measurable deposition rate. Furthermore, we show that deposition can be carried out over a wide pH region ranging from 1.5 to 12.5. The electro-deposition process is characterised in terms of electro-chemical methods including cyclic voltammetry, quartz crystal microbalance, impedance spectroscopy, constant amperometry and potentiometric titrations, while the deposits are analysed via Raman spectroscopy, infra-red spectroscopy, X-ray photoelectron spectroscopy and X-ray diffractometry. The determined oxygen contents are similar to those of chemically reduced graphene oxide, and the conductivity of the deposits was found to be ~20 S cm -1.
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Journal
Physical chemistry chemical physicsVolume
13Issue
20Pagination
9187 - 9193Publisher
Royal Society of ChemistryLocation
Cambridge, U. K.Publisher DOI
ISSN
1463-9076eISSN
1463-9084Language
engPublication classification
C1 Refereed article in a scholarly journalCopyright notice
2011, The Owner SocietiesUsage metrics
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