IIUM Repository

Facile one-step preparation and characterization of graphene quantum dots suspension via electrochemical exfoliation

Danial, Wan Hazman and Farouzy, Bashariah and Abdullah, Mundzir and Abdul Majid, Zaiton (2021) Facile one-step preparation and characterization of graphene quantum dots suspension via electrochemical exfoliation. In: IKM Pahang Branch Online Symposium 2021 : Chemistry for Sustainable World, 16 Jan 2021, Google Meet. (Unpublished)

Download (1MB) | Preview


The study reports on the production graphene quantum dots (GQDs) suspension using simple electrochemical setup which involved electrolyte solution, consisting of citric acid and sodium hydroxide (NaOH) mixture, and pristine graphite rods were used for the electrode without any heating treatment (calcination), thusly avoid any high energy consumption. The balanced reaction mixture of citric acid and NaOH was used to investigate the effects of reaction time and voltage used towards the production of GQDs. UV-Vis spectroscopy analysis revealed significant UV absorption around 240-255 nm which depicted π→π* transition of aromatic sp2 C-C bonds while FTIR analysis showed the significant C=C stretching band around 1635 cm-1 attributed by the aromatic ring. The exfoliation of the GQDs increased as the concentration of NaOH in electrolyte, time taken and voltage increased. The optimum GQDs suspension can be produced using the balanced ratio of citric acid and NaOH with a voltage of 10 V for 2 hours reaction time. TEM analysis confirmed the presence of the GQDs obtained with average size of ~5nm for the optimum GQDs suspension. The exfoliation of GQDs via the electrochemical technique might pave the way towards upscale and sustainable production of the nanomaterial.

Item Type: Conference or Workshop Item (Slide Presentation)
Subjects: Q Science > QD Chemistry
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button): Kulliyyah of Science > Department of Chemistry
Depositing User: Dr Wan Hazman Danial
Date Deposited: 22 Jun 2021 17:56
Last Modified: 22 Jun 2021 17:56
URI: http://irep.iium.edu.my/id/eprint/89867

Actions (login required)

View Item View Item


Downloads per month over past year