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Nanopatterning and plasmonic properties of plasma sputtered gold on diatom frustules

Published online by Cambridge University Press:  21 March 2013

Julien Romann  and
Mari-Ann Einarsrud
Julien Romann
Affiliation:
Department of Material Science and Engineering, Norwegian University of Science and Technology, NO-7491 Trondheim - NORWAY
Mari-Ann Einarsrud*
Affiliation:
Department of Material Science and Engineering, Norwegian University of Science and Technology, NO-7491 Trondheim - NORWAY
*
*Email: [email protected]
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Abstract

Bio-silica nanostructures from diatoms (called frustules) featuring plasmonic gold nanoparticles (NPs) are elaborated using two methods based on plasma sputtering of gold. The first investigated method uses a thermal treatment to induce the thermal dewetting of a plasma sputtered gold layer on the diatom frustules. The second method first consists of coating the frustules with polyethylene glycol before sputtering gold on these frustules. For both methods, the amount of gold appears to be a key parameter regarding the final obtained layer, which can either be nanostructured by cavities or consist in individual gold NPs. For an amount of sputtered gold equivalent to form a 5 nm thick layer, both methods allow obtaining diatom frustules covered by gold NPs with a size around 20 nm and a narrow size distribution. The UV-visible characterization of the diatom frustules featuring gold NPs highlights a plasmon extinction band in agreement with individual gold NPs with a size below 25 nm.

Keywords

Aubiomaterialnanostructure
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1509: Symposium CC – Optically Active Nanostructures , 2013 , mrsf12-1509-cc11-02
Copyright
Copyright © Materials Research Society 2013

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