Regeneration of a conjugated sp2 graphene system through selective defunctionalization of epoxides by using a proven synthetic chemistry mechanism
Graphene is a promising material capable of driving technological advancement. It is, however, a challenge to obtain pristine graphene in large quantities given the limitation of current synthetic methods. Among the numerous methods available, the chemical approach provides an optimistic outlook and...
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| Format: | Journal Article |
| Language: | English |
| Published: |
2014
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| Online Access: | https://hdl.handle.net/10356/102857 http://hdl.handle.net/10220/19203 |
| _version_ | 1811676560427581440 |
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| author | Chua, Chun Kiang Pumera, Martin |
| author2 | School of Physical and Mathematical Sciences |
| author_facet | School of Physical and Mathematical Sciences Chua, Chun Kiang Pumera, Martin |
| author_sort | Chua, Chun Kiang |
| collection | NTU |
| description | Graphene is a promising material capable of driving technological advancement. It is, however, a challenge to obtain pristine graphene in large quantities given the limitation of current synthetic methods. Among the numerous methods available, the chemical approach provides an optimistic outlook and has garnered much interest within the graphene community as a potential alternative. One of the most crucial steps of the chemical approach is the chemical reduction of graphene oxide as this dictates the final quality of the graphene sheets. In recent years, much of the focus has shifted to the usage of established reducing agents or oxygen removal reagents, frequently applied in organic chemistry, onto a graphene oxide platform. Herein, the selective removal of epoxide groups and subsequent regeneration of disrupted conjugated sp2 system is highlighted, based on the synergistic effect of indium and indium(I) chloride. The morphological, structural, and electrical properties of the resulting graphene were fully characterized with X-ray photoelectron, Fourier transform IR, solid-state 13C NMR, and Raman spectroscopy; thermogravimetric analysis; scanning electron microscopy; and conductivity measurements. The as-prepared graphene showed a tenfold increase in conductivity against conventional graphene treated with hydrazine reducing agent and demonstrated a high dispersion stability in ethanol. Moreover, the selective defunctionalization of the epoxide groups provides opportunities for potential tailoring of graphene properties for prospective applications. |
| first_indexed | 2024-10-01T02:23:25Z |
| format | Journal Article |
| id | ntu-10356/102857 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T02:23:25Z |
| publishDate | 2014 |
| record_format | dspace |
| spelling | ntu-10356/1028572020-03-07T12:31:22Z Regeneration of a conjugated sp2 graphene system through selective defunctionalization of epoxides by using a proven synthetic chemistry mechanism Chua, Chun Kiang Pumera, Martin School of Physical and Mathematical Sciences DRNTU::Science::Chemistry Graphene is a promising material capable of driving technological advancement. It is, however, a challenge to obtain pristine graphene in large quantities given the limitation of current synthetic methods. Among the numerous methods available, the chemical approach provides an optimistic outlook and has garnered much interest within the graphene community as a potential alternative. One of the most crucial steps of the chemical approach is the chemical reduction of graphene oxide as this dictates the final quality of the graphene sheets. In recent years, much of the focus has shifted to the usage of established reducing agents or oxygen removal reagents, frequently applied in organic chemistry, onto a graphene oxide platform. Herein, the selective removal of epoxide groups and subsequent regeneration of disrupted conjugated sp2 system is highlighted, based on the synergistic effect of indium and indium(I) chloride. The morphological, structural, and electrical properties of the resulting graphene were fully characterized with X-ray photoelectron, Fourier transform IR, solid-state 13C NMR, and Raman spectroscopy; thermogravimetric analysis; scanning electron microscopy; and conductivity measurements. The as-prepared graphene showed a tenfold increase in conductivity against conventional graphene treated with hydrazine reducing agent and demonstrated a high dispersion stability in ethanol. Moreover, the selective defunctionalization of the epoxide groups provides opportunities for potential tailoring of graphene properties for prospective applications. 2014-04-09T08:19:47Z 2019-12-06T21:01:14Z 2014-04-09T08:19:47Z 2019-12-06T21:01:14Z 2014 2014 Journal Article Chua, C. K., & Pumera, M. (2014). Regeneration of a conjugated sp2 graphene system through selective defunctionalization of epoxides by using a proven synthetic chemistry mechanism. Chemistry - A European Journal, 20(7), 1871-1877. 0947-6539 https://hdl.handle.net/10356/102857 http://hdl.handle.net/10220/19203 10.1002/chem.201304131 en Chemistry - a European journal © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. |
| spellingShingle | DRNTU::Science::Chemistry Chua, Chun Kiang Pumera, Martin Regeneration of a conjugated sp2 graphene system through selective defunctionalization of epoxides by using a proven synthetic chemistry mechanism |
| title | Regeneration of a conjugated sp2 graphene system through selective defunctionalization of epoxides by using a proven synthetic chemistry mechanism |
| title_full | Regeneration of a conjugated sp2 graphene system through selective defunctionalization of epoxides by using a proven synthetic chemistry mechanism |
| title_fullStr | Regeneration of a conjugated sp2 graphene system through selective defunctionalization of epoxides by using a proven synthetic chemistry mechanism |
| title_full_unstemmed | Regeneration of a conjugated sp2 graphene system through selective defunctionalization of epoxides by using a proven synthetic chemistry mechanism |
| title_short | Regeneration of a conjugated sp2 graphene system through selective defunctionalization of epoxides by using a proven synthetic chemistry mechanism |
| title_sort | regeneration of a conjugated sp2 graphene system through selective defunctionalization of epoxides by using a proven synthetic chemistry mechanism |
| topic | DRNTU::Science::Chemistry |
| url | https://hdl.handle.net/10356/102857 http://hdl.handle.net/10220/19203 |
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