期刊
CARBON
卷 138, 期 -, 页码 219-226出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2018.06.013
关键词
Graphene oxide; Reduction; Activation; High quality; Nanopore; Alkaline solution
资金
- Center for Advanced Study, University of Illinois at Urbana-Champaign as Global Frontier Project [2014M3A6A5060953]
- Nano-Material Technology Development Program - Ministry of Science, ICT and Future Planning [2016M3A7B4021151]
- Korea Electro-technology Research Institute [18-12-N0101-16/18]
- Korea Evaluation Institute of Industrial Technology (KEIT) [18-12-N0101-16] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The applications of solution-exfoliated graphene oxide (GO) as an electrical/electrochemical conductor require rational design-based approaches. Herein, we show that reduced GO nanosheets with highly ordered or nanoporous structures can be fabricated by treatment of graphite oxide (GrO) having variable-oxidation-degree with hot KOH solution. As model systems, GrO powders fabricated by modified Brodie and Hummers methods (B-GrO and H-GrO, respectively) were exfoliated into GO in alkaline solutions (to afford B-KGO and H-KGO, respectively), followed by 2.5-h refluxing at 100 degrees C. Notably, B-KGO was exceptionally resistant to hot KOH solution, whereas H-KGO was partially reduced under these conditions, as confirmed by C-13 solid-state NMR, X-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy analyses. Moreover, reduced B-KGO featured highly ordered structures, whereas reduced H-KGO contained nanopores resulting from low-temperature activation in KOH solution. These extraordinary reactions of KGO nanosheets were translated into different electrical properties of reduced KGO nanosheets and different rheological properties of the corresponding pastes. (C) 2018 Elsevier Ltd. All rights reserved.
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