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Photo-Fenton-inspired deoxygenation of tea polyphenol–graphene by household bleach

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2020, 30(4), pp.449-456
  • DOI : 10.1007/s42823-019-00114-z
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General
  • Received : August 5, 2019
  • Accepted : November 21, 2019
  • Published : August 1, 2020

Ismail Zulhelmi 1

1Innovative Material Focused Group (INNOMAT

Accredited

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 difcult and the application of centrifugation or fltration alone for the purifcation 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 purifcation 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 signifcantly after being purifed 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 purifed 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 afect 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 purifcation strategy would assist in the washing issue of polyphenol-stabilized graphene for various future electronic applications.

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