Electrochemical exfoliation of triangle-shaped graphene nanoflakes and graphene quantum dots suspension

Danial, Wan Hazman and Norhisham, Noriliya Aina and Ahmad Noorden, Ahmad Fakhrurrazi and Abdul Majid, Zaiton (2020) Electrochemical exfoliation of triangle-shaped graphene nanoflakes and graphene quantum dots suspension. In: The 6th International Online Conference on Science, Technology, and Interdisciplinary Research @ Universiti Teknologi Malaysia 2020, Kuala Lumpur, Malaysia. (Unpublished)

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Abstract

This study reports on the electrochemical exfoliation of graphene nanoflakes and graphene quantum dots (GQDs) suspension using electrochemical exfoliation under the influence of anionic surfactant, sodium dodecylbenzene sulfonate (SDBS). A simple electrochemical set up was employed using pristine and heated graphite electrodes. The prepared graphene nanoflakes and GQDs suspension were characterized using UV-visible spectroscopy, transmission electron microscope (TEM) and Raman Spectroscopy. The UV absorption spectra showed a bathochromic shift from the typical π → π* transition peak which due to the introduction of oxygen groups and/or functionalization of SDBS into the graphitic layers. Morphological analyses using TEM revealed the usage of heated graphite electrodes (600°C at 5 min) produced a triangle-shaped graphene nanoflakes with an average size of ~34 nm while the average size of the graphene nanoflakes obtained using the pristine graphite is ~47 nm. The graphene nanoflakes which have size less than 10 nm from both samples can be attributed to the presence of the GQDs. Raman analysis revealed ID/IG ratio of 0.223 and 0.203 for graphene nanoflakes electrochemically exfoliated from pristine and heated graphite respectively, which signifies a better quality and crystallinity and has low defects within the conjugated graphene backbone.

Item Type:	Conference or Workshop Item (Slide Presentation)
Additional Information:	8124/89798
Subjects:	Q Science > QD Chemistry
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Science Kulliyyah of Science > Department of Chemistry Kulliyyah of Science > Department of Physics
Depositing User:	Dr Wan Hazman Danial
Date Deposited:	04 Aug 2021 17:20
Last Modified:	04 Aug 2021 17:20
URI:	http://irep.iium.edu.my/id/eprint/89798

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