Ice-templating synthesis of macroporous noble metal/3D-graphene nanocomposites: their fluorescence lifetimes and catalytic study

Sahoo, Prasanta Kumar and Panigrahy, Bharati and Thakur, Dinbandhu and Bahadur, Dhirendra (2017) Ice-templating synthesis of macroporous noble metal/3D-graphene nanocomposites: their fluorescence lifetimes and catalytic study. In: NEW JOURNAL OF CHEMISTRY, 41 (16). pp. 7861-7869.

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Abstract

Porous architectures of 3D-graphene assembled with noble metal (Au, Pd and Pt) nanoparticles were successfully fabricated through a one-step green route using a low-cost freeze-casting method. The as-synthesized noble metal/3D-graphene nanocomposites exhibit ultralow density and interconnected 3-D porous networks with a uniform distribution of noble metal nanoparticles. Time-correlated single photon counting (TCSPC) measurements reveal the energy and electron transfer at the interface of the graphene sheets and noble metals, which is maximum in the case of Pt/3D-graphene due to the small size of the Pt nanoparticles. The as-obtained noble metal/3D-graphene nanocomposites were applied to the reduction of 4-nitrophenol and methylene blue by NaBH4. The rates of reduction are in the order Pt/3D-graphene > Pd/3D-graphene > Au/3D-graphene for both the reduction reactions, signifying that the smallest noble metal nanoparticles possess the highest catalytic activity. The Pt/3D-graphene nanocomposite also exhibits excellent catalytic activity in comparison to the RGO/Pt nanocomposite, which is due to its unique 3D-porous structure. Moreover, the Pt/3D-graphene nanocomposite could be easily separated from the reaction solution by simple filtration and recycled for five cycles without the loss of its catalytic activity. Noble metal/3D-graphene nanocomposites can be utilized as attractive, low-cost, efficient fixed bed reactors and as easily separable catalysts in industrial applications for the reduction of 4-nitrophenol and methylene blue with high catalytic activity and exceptional absorption capability.

Item Type:	Journal Article
Publication:	NEW JOURNAL OF CHEMISTRY
Additional Information:	Copy right for this article belongs to the ROYAL SOC CHEMISTRY, THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	01 Sep 2017 06:37
Last Modified:	01 Sep 2017 06:37
URI:	http://eprints.iisc.ac.in/id/eprint/57692

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