Journal
ACS NANO
Volume 4, Issue 6, Pages 3381-3389Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn1000386
Keywords
graphene; density gradient; separation; ultracentrifuge; monodisperse
Categories
Funding
- NSFC
- 973 Program [2009CB939802]
- 111 Project [B07004]
- Foundation for Authors of National Excellent Doctoral Dissertations of P. R. China
- Program for New Century Excellent Talents in University
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A simple density gradient ultracentrifuge separation method has been developed for sorting chemically modified graphene (CMG) by sheet size and surface chemistry in just a few minutes. By optimizing the parameters, including the density gradient and centrifugation time, CMG sheets with specific size ranges and optical properties can be targeted selectively. UV vis absorbance and photoluminescence spectra revealed the properties of separated CMG samples are highly dependent on their sheet size and degree of oxidation. A possible mechanism for the separation is discussed.
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