Influence of pH condition on colloidal suspension of exfoliated graphene oxide by electrostatic repulsion

Journal Article · Wed Feb 15 00:00:00 EST 2012 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2011.11.023· OSTI ID:21612897

Meng, Long-Yue ^[1]; Park, Soo-Jin ^[1]

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1. Department of Chemistry, Inha University, 253 Nam-gu, Incheon 402-751 (Korea, Republic of)

A facile chemical process is described to produce graphene oxide utilizing a zwitterions amino acid intermediate from graphite oxide sheets. 11-aminoundecanoic acid molecules were protonated to intercalate molecules into the graphite oxide sheets to achieve ion exchange, and the carboxyl groups were then ionized in a NaOH solution to exfoliate the graphite oxide sheets. In this way, the produced graphene oxide nanosheets were stably dispersed in water. The delaminated graphene nanosheets were confirmed by XRD, AFM, and TEM. XRD patterns indicated the d{sub 002}-spacing of the graphite greatly increased from 0.380 nm and 0.870 nm. AFM and TEM images showed that the ordered graphite crystal structure of graphene nanosheets was effectively exfoliated by this method. The prepared graphene nanosheets films showed 87.1% transmittance and a sheet resistance of 2.1 Multiplication-Sign 10{sup 3} {Omega}/square. - Graphical abstract: A stable graphene oxide suspension could be quickly prepared by exfoliating a graphite oxide suspension by a host-guest electrostatic repulsion in aqueous solution. Highlights: Black-Right-Pointing-Pointer Graphene nanosheets were prepared by a zwitterions amino acid intermediate from graphite oxide. Black-Right-Pointing-Pointer 11-aminoundecanoic acid was protonated to intercalate molecules into the graphene oxide to achieve ion exchange. Black-Right-Pointing-Pointer The d{sub 002}-spacing of the graphite oxide greatly increased from 0.330 nm to 0.415 nm after 11-aminoundecanoic acid treatment.

• OSTI ID: 21612897
• Journal Information: Journal of Solid State Chemistry, Vol. 186; Other Information: DOI: 10.1016/j.jssc.2011.11.023; PII: S0022-4596(11)00626-8; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
AMINO ACIDS
AQUEOUS SOLUTIONS
ATOMIC FORCE MICROSCOPY
CLATHRATES
CRYSTAL STRUCTURE
FILMS
GRAPHITE
IMAGES
ION EXCHANGE
MOLECULES
NANOSTRUCTURES
OXIDES
SHEETS
SODIUM HYDROXIDES
SUSPENSIONS
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
ALKALI METAL COMPOUNDS
CARBON
CARBOXYLIC ACIDS
CHALCOGENIDES
COHERENT SCATTERING
DIFFRACTION
DISPERSIONS
ELECTRON MICROSCOPY
ELEMENTS
HOMOGENEOUS MIXTURES
HYDROGEN COMPOUNDS
HYDROXIDES
MICROSCOPY
MINERALS
MIXTURES
NONMETALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
SCATTERING
SODIUM COMPOUNDS
SOLUTIONS