Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 2, Issue 9, Pages 1004-1008Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jz2003556
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Funding
- National Science Foundation [DMR-0520513, EEC-0647560, DMR-1006391]
- Army Research Office (ARO) [ARO W911NF-05-1-0177]
- Nanoelectronics Research Initiative
- Natural Sciences and Engineering Research Council of Canada
- NSF-NSEC
- NSF-MRSEC
- Keck Foundation
- State of Illinois
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1006391] Funding Source: National Science Foundation
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The ability to disperse pristine graphene at high concentrations in aqueous solutions is an enabling step for large-scale processing and emerging biomedical applications. Herein we demonstrate that nonionic, biocompatible block copolymers are able to produce graphene dispersions with concentrations exceeding 0.07 mg mL(-1) via sonication and centrifugation, resulting in optical densities above 4 OD cm(-1) in the visible and near-infrared regions of the electromagnetic spectrum. The dispersion efficiency of graphene using Pluronic and Tetronic block copolymers varies substantially depending on the lengths of their hydrophilic and hydrophobic domains, with the best of these copolymers sharing similar domain molecular weight ratios and comparable overall molecular weights. This study presents a new class of biocompatible dispersing agents for graphene in aqueous solution, thus suggesting a facile route to employ graphene in biomedical sensing, imaging, and therapeutic applications.
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