Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 22, Issue 15, Pages 3307-3314Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201200242
Keywords
reduced graphene oxide nanosheets; cation-p interaction; electrical conductivity; doping; high concentration; printed electronics
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Funding
- Fundamental R&D Program for Core Technology of Materials
- Ministry of Knowledge Economy
- Center for Advanced Soft Electronics under the Global Frontier Research Program of the Ministry of Education, Science and Technology, Korea [2011-0032157]
- Korea Evaluation Institute of Industrial Technology (KEIT) [K0006031] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Council of Science & Technology (NST), Republic of Korea [12-12-N0101-33] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A novel route to preparing highly concentrated and conductive reduced graphene oxide (RGO) in various solvents by monovalent cationp interaction. Previously, the hydrophobic properties of high-quality RGO containing few defects and oxygen moieties have precluded the formation of stable dispersion in various solvents. Cationp interaction between monovalent cations, such as Na+ or K+, and six-membered sp2 carbons on graphene were achieved by simple aging process of graphene oxide (GO) nanosheets dispersed in alkali solvent. The noncovalent binding forces introduced by the cationp interactions were evident from the chemical shift of the sp2 peak in the solid 13C NMR spectra. Raman spectra and the I-V characteristics demonstrated the interactions in terms of the presence of n-type doping effect due to the adsorption of cations with high electron mobility (39 cm2/Vs). The RGO film prepared without a post-annealing process displayed superior electrical conductivity of 97,500 S/m at a thickness of 1.7 mu m. Moreover, mass production of GO paste with a concentration as high as 20 g/L was achieved by accelerating the cationp interactions with densification process. This strategy can facilitate the development of large scalable production methods for preparing printed electronics made from high-quality RGO nanosheets.
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