Change search
ReferencesLink to record
Permanent link

Direct link
Time resolved growth of membrane stabilized silver NPs and their catalytic activity
Show others and affiliations
2014 (English)In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 4, 59379- p.Article in journal (Refereed) Published
Abstract [en]

Formation of highly stable metal nanostructures in a Nafion(R) 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(R) (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(R)-117 ion-exchange membrane during in situ L-ascorbic acid reduction of Ag+ ions by time resolved 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 similar to 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 similar to 3 nm, confined in the hydrophilic clusters of the Nafion(R) matrix, have reasonably good catalytic activity and a lower lag time for the onset of reduction.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2014. Vol. 4, 59379- p.
National Category
Physical Chemistry
URN: urn:nbn:se:kth:diva-180262DOI: 10.1039/c4ra10400eISI: 000345652300059ScopusID: 2-s2.0-84911930522OAI: diva2:891987

QC 20160122

Available from: 2016-01-08 Created: 2016-01-08 Last updated: 2016-01-22Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Yu, Shun
In the same journal
RSC Advances
Physical Chemistry

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 47 hits
ReferencesLink to record
Permanent link

Direct link