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In relation to this article, we declare that there is no conflict of interest.
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Received February 7, 2017
Accepted April 4, 2017
articles This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Synthesis of colloidal plasmonic microspheres via spontaneous formation and three-dimensional assembly of metal nanoparticles

Department of Chemical and Biomolecular Engineering, Sogang University, Seoul 04107, Korea 1Department of Mechanical Engineering, Sogang University, Seoul 04107, Korea
twkang@sogang.ac.kr
Korean Journal of Chemical Engineering, July 2017, 34(7), 2086-2091(6), 10.1007/s11814-017-0099-9
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Abstract

We report the synthesis of colloidal plasmonic microspheres by taking advantage of emulsions of polydimethylsiloxane (PDMS) in metal precursor solution. Within the emulsion, both the spontaneous formation and threedimensional (3D) assembly of metal nanoparticles take place at room temperature. The number of the nanoparticles being assembled in the microsphere is controllable according to the concentration of a metal precursor. In addition, owing to the surface charge and porosity of PDMS, positively charged and neutral molecules can be more concentrated in the plasmonic microsphere. We use this plasmonic microsphere for the detection of environmentally and biologically important molecules via surface-enhanced Raman spectroscopy, since 3D assembly of metal nanoparticles in the microsphere is size-comparable to a probed volume of incident light.

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