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Open AccessArticle

Nanocomposites Polarizing by Absorption: Dichroism in the Near-Infrared Region (NIR)

Department of Materials, Eidgenössische Technische Hochschule (ETH) Zürich, Wolfgang‑Pauli‑Strasse 10, Zürich CH-8093, Switzerland
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Materials 2014, 7(3), 1899-1911; https://doi.org/10.3390/ma7031899
Received: 15 January 2014 / Revised: 21 February 2014 / Accepted: 25 February 2014 / Published: 5 March 2014
(This article belongs to the Special Issue Nanocomposites of Polymers and Inorganic Particles 2013)
We describe the preparation of nanocomposites which exhibit dichroism in the near infrared region (NIR). These materials consist of crosslinked poly(dimethylsiloxane) (PDMS) and gold nanoparticles, coated with 1-dodecanethiol or tert-tetradecanethiol. The alkanethiols improve dispersibility of the gold particles, and accordingly composites were manufactured by diffusion of the particles into swollen self-supporting PDMS elastomer films. After drying, the films were exposed to solvents for one minute, stretched in wet state, dried again and annealed. This procedure led to formation of oriented linear gold particle assemblies within stretched polymer. If the aspect ratio of the particle assemblies is high, the absorption of polarized light in the NIR region is expected to depend on the angle between the polarization plane and the orientation direction of the particle assemblies, and this was observed to be the case. View Full-Text
Keywords: nanocomposites; polymers; gold nanoparticles; alkanethiols; surface modification; elastomers; poly(dimethylsiloxane); optical properties; dichroism; near infrared nanocomposites; polymers; gold nanoparticles; alkanethiols; surface modification; elastomers; poly(dimethylsiloxane); optical properties; dichroism; near infrared
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MDPI and ACS Style

Bonderer, L.; Uhlenhaut, D.I.; Smith, P.; Caseri, W. Nanocomposites Polarizing by Absorption: Dichroism in the Near-Infrared Region (NIR). Materials 2014, 7, 1899-1911.

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