Single Laser Pulse Effects on Suspended-Au-Nanoparticle Size Distributions and Morphology

Samples of suspended gold nanoparticles in the diameter range 10 to 100 nm were subjected to a single 7 ns pulse from a 532 nm laser to determine the effect of laser power on particle size distribution, mean size, and morphology. The experimental techniques used were dynamic light scattering (DLS),...

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Bibliographic Details
Published in:Journal of physical chemistry. C 2013-05, Vol.117 (20), p.10866-10875
Main Authors: Cavicchi, Richard E, Meier, Douglas C, Presser, Cary, Prabhu, Vivek M, Guha, Suvajyoti
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Fullerenes and related materials
Low-dimensional structures (superlattices, quantum well structures, multilayers): structure, and nonelectronic properties
Materials science
Nanocrystalline materials
Nanoscale materials and structures: fabrication and characterization
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Other topics in nanoscale materials and structures
Physics
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
Visible and ultraviolet spectra
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Summary:Samples of suspended gold nanoparticles in the diameter range 10 to 100 nm were subjected to a single 7 ns pulse from a 532 nm laser to determine the effect of laser power on particle size distribution, mean size, and morphology. The experimental techniques used were dynamic light scattering (DLS), depolarized dynamic light scattering (DDLS), electrospray-differential mobility analysis (ES-DMA), ultraviolet–visible absorption spectroscopy, and transmission electron microscopy (TEM). For 60 nm particles, a laser pulse of fluence 10 mJ/cm2 was sufficient to produce observable changes. In the range 10–72 mJ/cm2, DLS indicated little change in mean particle size but a more than three-fold reduction in the polydispersity index (significantly tightened distribution) and a decrease in scattering intensity. TEM showed that the particles became highly spherical and that there was a growing population of particles
ISSN:1932-7447
1932-7455
DOI:10.1021/jp4041502