Pulsed laser excitation of phosphate stabilised silver nanoparticles

Mohanty, Jyotirmayee ; Palit, Dipak K. ; Shastri, Laxminarayan V. ; Sapre, Avinash V. (2000) Pulsed laser excitation of phosphate stabilised silver nanoparticles Proceedings of the Indian Academy of Sciences - Chemical Sciences, 112 (1). pp. 63-72. ISSN 0253-4134

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Official URL: http://www.ias.ac.in/chemsci/Pdf-Feb2K/Pc2867.pdf

Related URL: http://dx.doi.org/10.1007/BF02704301

Abstract

Laser flash photolysis studies were carried out on two types of silver nanoparticles prepared by γ-radiolysis of Ag+ solutions in the presence of polyphosphate as the stabiliser. Type I silver nanoparticles displayed a surface plasmon band at 390 nm. Type II silver nanoparticles showed a 390 nm surface plasmon band with a shoulder at 550 nm. On photoexcitation in the surface plasmon band region, using 35 picosecond laser pulses at 355 nm and 532 nm, the type II solutions showed transient bleaching and absorption signals in the 450-900 nm region, which did not decay appreciably up to 5 nanoseconds. These transient changes were found to get annealed in the intervalt where 5ns < t < 100 ns. Extended photolysis of the nanoparticle solutions with repetitive laser pulses resulted in a decrease in the values of the average particle size which were measured by employing the dynamic light scattering technique.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:Pulsed Laser Excitation; Silver Nanoparticles; Surface Plasmon Band; Sodium Polyphosphate Stabilizer
ID Code:34149
Deposited On:31 Mar 2011 06:03
Last Modified:17 May 2016 17:03

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