Journal Article

PUBDB-2015-01236

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Time Resolved Growth of Membrane Stabilized Silver NPs and their Catalytic Activity

Patra, S. ; Sen, D.>Extern* ; Pandey, A. K. ; Bahadur, J.>Extern* ; Mazumder, S.>Extern* ; Ramagiri, S. V. ; Bellare, J. R. ; Roth, S. V.DESY* ; Santoro, G.>Extern* ; Yu, S.>Extern* ; Goswami, A. (Corresponding author)

2014
RSC Publishing London

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Please use a persistent id in citations: doi:10.1039/C4RA10400E

Abstract: Formation of highly stable metal nanostructures in a Nafion® membrane with various aspect ratios has been of considerable research interest in recent years. However, there is a need for a proper understanding of the growth mechanism of such nanostructures in Nafion® (sometimes larger than the size of water–sulfonate ionic clusters of the membrane). In this work, the early growth kinetics of silver nanoparticles (NPs) in Nafion®-117 ion-exchange membrane during $\mathit{in situ}$ L-ascorbic acid reduction of $Ag^{+}$ ions by time resolved $\mathit{in situ}$ small-angle X-ray scattering (SAXS) using synchrotron radiation with a time resolution of 50 ms are revealed for the first time. The SAXS analyses, corroborated by transmission electron microscopy, showed that the sizes of NPs increase rapidly together with their number density until they attain a certain size that could be accommodated in the ~5 nm water–sulfonate ionic clusters. Further growth takes place either by self-agglomeration of the particles ejected out from the water–sulfonic acid clusters or by continuous reduction of metal ions on the existing NP surfaces (uniformly or on a specific plane) leading to formation of bigger nanostructures with various aspect ratios. The time resolved information of NP growth provides an opportunity for the controlled synthesis of metal NPs with a definite size, shape and size distribution for a specific application. The catalytic properties of Ag NPs formed in the membrane were examined using borohydride reduction of a model dye methylene blue. It was observed that smaller Ag NPs with a mean diameter ~3 nm, confined in the hydrophilic clusters of the Nafion® matrix, have reasonably good catalytic activity and a lower lag time for the onset of reduction.

Note: (c) The Royal Society of Chemistry. Post referee full text in progress. Embargo for full text 1 year from 24th October 2014.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. Experimentebetreuung PETRA III (FS-PE)

Research Program(s):

1. PETRA Beamline P03 (POF2-54G14) (POF2-54G14)
2. INDIA-DESY - INDIA-DESY Collaboration (2020_Join2-INDIA-DESY) (2020_Join2-INDIA-DESY)

Experiment(s):

1. PETRA Beamline P03 (PETRA III)

Appears in the scientific report 2014

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Database coverage:
; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; NCBI Molecular Biology Database ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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