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Cited by 786

The DOI matches its Crossref record; 67 of the 67 references it cites were found in a registry or an index.

Synthesis and Size-Selective Catalysis by Supported Gold Nanoparticles: Study on Heterogeneous and Homogeneous Catalytic Process

Panigrahi, Sudipa, Basu, Soumen, Praharaj, Snigdhamayee, Pande, Surojit, Jana, Subhra, Pal, Anjali, Ghosh, Sujit Kumar, Pal, Tarasankar·2007·The Journal of Physical Chemistry C
DOI 10.1021/jp067554u
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Abstract

Core−shell nanocomposites (R−Au) bearing well-defined gold nanoparticles as surface atoms of variable sizes (8−55 nm) have been synthesized exploiting polystyrene-based commercial anion exchangers. Immobilization of gold nanoparticles, prepared by the Frens method, onto the resin beads in the chloride form is possible by the ready exchange of the citrate-capped negatively charged gold particles. The difficulty of nanoparticle loading, avoiding aggregation, has been solved by stepwise operation. Analysis of the gold particles after immobilization and successive elution confirm the unaltered particle morphology while compared to those of the citrate-capped gold particles in colloidal dispersion. It was observed that the rate of the reaction increases with the increase in catalyst loading, which suggests the catalytic behavior of the gold nanoparticles for the reduction of the aromatic nitrocompounds. The rate constant, k, was found to be proportional to the total surface area of the nanoparticles in the system. Kinetic study for the reduction of a series of aromatic nitrocompounds reveals that the aromatic nitrocompound exclusively adsorbs to atop sites of gold particles and that the rate of the reduction reaction increases as the particle size decreases. Similar reaction kinetics was observed involving gold sol of variable size (homogeneous catalysis) as catalyst. The induction time and the activation energy of the reaction decreases with decrease in particle size indicating the decrease in activation energy for the smaller particles, which also speaks for the increase of surface roughness with decrease in particle size. The observed rate dependence, in relation to particle size, is attributed to a higher reactivity of the coordinatively unsaturated surface atoms in small particles compared to low-index surface atoms prevalent in larger particles.

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Metadata

Authors
Panigrahi, S., Basu, S., Praharaj, S., Pande, S., Jana, S., Pal, A., Ghosh, S. K., & Pal, T.
Venue
The Journal of Physical Chemistry C
Publisher
American Chemical Society (ACS)
Published
2007-03-01
Volume
111
Issue
12
Pages
4596-4605
ISSN
  • 1932-7447 (ISSN-L)
  • 1932-7455
DOI
10.1021/jp067554u
OpenAlex
W2010762542
Cited by
786
References
67
FWCI
15.91
Type
journal article
Language
en
Open access
closed

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