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Author

Park, Soojin
Nano-Functional Materials Lab
Research Interests
  • Block Copolymers, nanostructured materials for Lithium-Ion batteries, wearable and stretchable energy storage applications

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Fabrication of Pt/Au Concentric Spheres from Triblock Copolymer

Cited 18 times inthomson ciCited 15 times inthomson ci
Title
Fabrication of Pt/Au Concentric Spheres from Triblock Copolymer
Author
Koh, Haeng-DeogPark, SoojinRussell, Thomas P.
Keywords
block copolymer; hollow micelle; bimetallic metal; concentric sphere
Issue Date
201002
Publisher
AMER CHEMICAL SOC
Citation
ACS NANO, v.4, no.2, pp.1124 - 1130
Abstract
Dispersion of an aqueous H 2PtCl 6 solution into a trifluorotoluene (TFT) solution of a polystyreneblock-poly(2-vinylpyridine)- block-poly(ethylene oxide) (PS-b-P2VP-b-PEO) triblock copolymer produced an emulsion-induced hollow micelle (EIHM), comprising a water nanodroplet stabilized by PEO, H 2PtCl 6/P2VP, and PS, sequentially. The following addition of an aqueous LiAuCl 4 solution into the dispersion led to a coordination of LiAuCl 4 and PEO. The resulting spherical EIHM structure was transformed to a hollow cylindrical micelle by the fusion of spherical EIHM with the addition of methanol. This structural transition was reversible by the alternative addition of methanol and TFT. Oxygen plasma was used to generate Pt/Au concentric spheres and hollow cylindrical Pt/Au nano-objects.
URI
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DOI
http://dx.doi.org/10.1021/nn9016026
ISSN
1936-0851
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