The Influence of Lateral Size and Oxidation of Graphene Oxide on Its Chemical Reduction and Electrical Conductivity of Reduced Graphene Oxide
The chemical reduction efficiencies of graphene oxide (GO) are critically important in achieving graphene-like properties in reduced graphene oxide (rGO). In this study, we assessed GO lateral size and its degree of oxidation effect on its chemical reduction efficiency in both suspension and film an...
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MDPI AG
2022-11-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/27/22/7840 |
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| author | Hak Jin Sim Zheling Li Ping Xiao Hui Lu |
| author_facet | Hak Jin Sim Zheling Li Ping Xiao Hui Lu |
| author_sort | Hak Jin Sim |
| collection | DOAJ |
| description | The chemical reduction efficiencies of graphene oxide (GO) are critically important in achieving graphene-like properties in reduced graphene oxide (rGO). In this study, we assessed GO lateral size and its degree of oxidation effect on its chemical reduction efficiency in both suspension and film and the electrical conductivity of the corresponding rGO films. We show that while GO-reduction efficiency increases with the GO size of lower oxidation in suspension, the trend is opposite for film. FESEM, XRD, and Raman analyses reveal that the GO reduction efficiency in film is affected not only by GO size and degree of oxidation but also by its interlayer spacing (restacking) and the efficiency is tunable based on the use of mixed GO. Moreover, we show that the electrical conductivity of rGO films depends linearly on the C/O and Raman I<sub>D</sub>/I<sub>G</sub> ratio of rGO and not the lateral size of GO. In this study, an optimal chemical reduction was achieved using premixed large and small GO (L/SGO) at a ratio of 3:1 (<i>w</i>/<i>w</i>). Consequently, the highest electrical conductivity of 85,283 S/m was achieved out of all rGO films reported so far. We hope that our findings may help to pave the way for a simple and scalable method to fabricate tunable, electrically conductive rGO films for electronic applications. |
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| id | doaj.art-025d6ddffa3246cf9c01b64c5e82f44a |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-09T18:06:34Z |
| publishDate | 2022-11-01 |
| publisher | MDPI AG |
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| series | Molecules |
| spelling | doaj.art-025d6ddffa3246cf9c01b64c5e82f44a2023-11-24T09:22:01ZengMDPI AGMolecules1420-30492022-11-012722784010.3390/molecules27227840The Influence of Lateral Size and Oxidation of Graphene Oxide on Its Chemical Reduction and Electrical Conductivity of Reduced Graphene OxideHak Jin Sim0Zheling Li1Ping Xiao2Hui Lu3School of Biological Sciences, Faculty of Biology, Medicine and Health, The University of Manchester, Manchester M13 9PT, UKDepartment of Materials, National Graphene Institute, Faculty of Science and Engineering, The University of Manchester, Manchester M13 9PL, UKDepartment of Materials, Henry Royce Institute, Faculty of Science and Engineering, The University of Manchester, Manchester M13 9PL, UKSchool of Biological Sciences, Faculty of Biology, Medicine and Health, The University of Manchester, Manchester M13 9PT, UKThe chemical reduction efficiencies of graphene oxide (GO) are critically important in achieving graphene-like properties in reduced graphene oxide (rGO). In this study, we assessed GO lateral size and its degree of oxidation effect on its chemical reduction efficiency in both suspension and film and the electrical conductivity of the corresponding rGO films. We show that while GO-reduction efficiency increases with the GO size of lower oxidation in suspension, the trend is opposite for film. FESEM, XRD, and Raman analyses reveal that the GO reduction efficiency in film is affected not only by GO size and degree of oxidation but also by its interlayer spacing (restacking) and the efficiency is tunable based on the use of mixed GO. Moreover, we show that the electrical conductivity of rGO films depends linearly on the C/O and Raman I<sub>D</sub>/I<sub>G</sub> ratio of rGO and not the lateral size of GO. In this study, an optimal chemical reduction was achieved using premixed large and small GO (L/SGO) at a ratio of 3:1 (<i>w</i>/<i>w</i>). Consequently, the highest electrical conductivity of 85,283 S/m was achieved out of all rGO films reported so far. We hope that our findings may help to pave the way for a simple and scalable method to fabricate tunable, electrically conductive rGO films for electronic applications.https://www.mdpi.com/1420-3049/27/22/7840graphene oxidereduced graphene oxideGO reduction efficiencieselectrical conductivitygraphene-related materials and films |
| spellingShingle | Hak Jin Sim Zheling Li Ping Xiao Hui Lu The Influence of Lateral Size and Oxidation of Graphene Oxide on Its Chemical Reduction and Electrical Conductivity of Reduced Graphene Oxide Molecules graphene oxide reduced graphene oxide GO reduction efficiencies electrical conductivity graphene-related materials and films |
| title | The Influence of Lateral Size and Oxidation of Graphene Oxide on Its Chemical Reduction and Electrical Conductivity of Reduced Graphene Oxide |
| title_full | The Influence of Lateral Size and Oxidation of Graphene Oxide on Its Chemical Reduction and Electrical Conductivity of Reduced Graphene Oxide |
| title_fullStr | The Influence of Lateral Size and Oxidation of Graphene Oxide on Its Chemical Reduction and Electrical Conductivity of Reduced Graphene Oxide |
| title_full_unstemmed | The Influence of Lateral Size and Oxidation of Graphene Oxide on Its Chemical Reduction and Electrical Conductivity of Reduced Graphene Oxide |
| title_short | The Influence of Lateral Size and Oxidation of Graphene Oxide on Its Chemical Reduction and Electrical Conductivity of Reduced Graphene Oxide |
| title_sort | influence of lateral size and oxidation of graphene oxide on its chemical reduction and electrical conductivity of reduced graphene oxide |
| topic | graphene oxide reduced graphene oxide GO reduction efficiencies electrical conductivity graphene-related materials and films |
| url | https://www.mdpi.com/1420-3049/27/22/7840 |
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