Zulhelmi, Ismail (2020) Photo-Fenton-inspired deoxygenation of tea polyphenol–graphene by household bleach. Carbon Letters, 30 (4). pp. 449-456. ISSN 1976-4251. (Published)
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Abstract
A liquid-phase exfoliation of few-layer graphene in tea is considered as one of the alternative approaches for the preparation of environment-friendly graphene. However, the removal of chemically adsorbed tea-polyphenols from graphene is known to be difficult and the application of centrifugation or filtration alone for the purification of graphene against tea-polyphenols is regarded to be almost technically impossible. Notably, a strategy for facile deoxygenation of tea-graphene must be established for a green and economical production of graphene to be realized. In this work, a simple purification method of graphene through the application of merely a household bleach (Clorox®) after the pre-exfoliation in black tea has been proposed. It has been found that the carbon–oxygen (C/O) value for graphene increases from 2.7 to 8.1 while the values of C–OH, C–O–C and C=O region in the C1s spectrum of graphene decrease significantly after being purified in bleach for 5 h. The stretching and shift of C–OH, C=O and C–O–C at 3468 cm−1, 1637 cm−1 and 1008 cm−1 from IR spectrum of purified graphene seems to be in agreement with the produced data from the XPS and Raman spectroscopy. Despite the enhanced ID/IG of Raman from the hybridization of sp2 by hydroxylation, the deoxygenation of tea-graphene does not negatively affect the electrical performance since the sheet resistance was impressively reduced to 193 Ω from 2.1 kΩ. It is believed that this photo-Fenton-inspired purification strategy would assist in the washing issue of polyphenol-stabilized graphene for various future electronic applications.
| Item Type: | Article |
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| Additional Information: | Indexed by Scopus |
| Uncontrolled Keywords: | Bleach; Graphene; Liquid-phase exfoliation; Polyphenols; Purification |
| Subjects: | Q Science > QC Physics T Technology > TK Electrical engineering. Electronics Nuclear engineering T Technology > TP Chemical technology |
| Faculty/Division: | Faculty of Manufacturing Engineering College of Engineering |
| Depositing User: | En. Zulhelmi Ismail |
| Date Deposited: | 10 Aug 2020 02:13 |
| Last Modified: | 10 Aug 2020 02:13 |
| URI: | http://umpir.ump.edu.my/id/eprint/28866 |
| Download Statistic: | View Download Statistics |
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