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Issue 48, 2014
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CW-laser-induced morphological changes of a single gold nanoparticle on glass: observation of surface evaporation

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Abstract

Pulsed-laser heating of colloidal noble-metal nanoparticles in an aqueous solution induces morphological changes such as size reduction. However, the technique suffers disadvantages through polydispersed products. Here, we show that continuous-wave (CW) laser heating of single gold nanoparticles is capable of generating particles of smaller diameters with superb control in terms of exposure time and intensity. We show, based on calculations of particle temperatures under illumination, that surface evaporation below the boiling point of bulk gold occurs, resulting in a gradual diameter decrease in air. In our experiment, a focused illumination of Au NPs through an objective lens of a microscope provided peak-power densities (106–107 W cm−2) equivalent to that of a typical nanosecond laser. Nevertheless the heating rate under CW laser illumination is much lower than that under pulsed-laser illumination, resulting in better control over nanoparticle heating and related morphological changes. Furthermore, the single-particle study of such heating helps us to clarify the evolution of such changes to a given particle.

Graphical abstract: CW-laser-induced morphological changes of a single gold nanoparticle on glass: observation of surface evaporation

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Supplementary files

Article information


Submitted
20 Aug 2014
Accepted
28 Oct 2014
First published
30 Oct 2014

Phys. Chem. Chem. Phys., 2014,16, 26938-26945
Article type
Paper
Author version available

CW-laser-induced morphological changes of a single gold nanoparticle on glass: observation of surface evaporation

K. Setoura, Y. Okada and S. Hashimoto, Phys. Chem. Chem. Phys., 2014, 16, 26938
DOI: 10.1039/C4CP03733B

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