Ultrasonic Synthesis of Functional Materials by Muthupandian Ashokkumar

Author:Muthupandian Ashokkumar
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

Exfoliated graphene sheets have found applications in fuel cells and sensors. Functionalised reduced graphene oxide (RGO) nanoparticles were sonochemically synthesised by Vinodgopal et al. [43]. High frequency sonication (211 kHz) of an aqueous solution containing GO, gold chloride and PEG resulted in the simultaneous reduction of GO to RGO and deposition of gold nanoparticles on the surface of RGO sheets (Fig. 2.5). In a follow up study, the authors have used a dual frequency approach to generate exfoliated RGO-Pt nanocomposites with better efficiency towards methanol oxidation process [44]. In this case, the strong physical forces generated by 20 kHz ultrasound was used for the exfoliation of GO and the high frequency ultrasound was used to achieve reduction reactions necessary for the generation of RGO-Pt nanocomposites.

Fig. 2.5TEM micrograph of the RGO-Au composite prepared by the sonochemical reduction of GO and Au(III) ions using 211 kHz. Adapted from Ref. [43]

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