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ACS Appl Mater Interfaces. 2015 Mar 4;7(8):4902-12. doi: 10.1021/am508993z. Epub 2015 Feb 23.

Light-responsive plasmonic arrays consisting of silver nanocubes and a photoisomerizable matrix.

Author information

1
School of Materials Science and Engineering and ┬žLaser Dynamics Laboratory, School of Chemistry and Biochemistry, Georgia Institute of Technology , Atlanta, Georgia 30332, United States.

Abstract

We report on the synthesis of novel branched organic-inorganic azo-polyhedral oligomeric silsesquioxane (POSS) conjugates (Azo-POSS) and their use as a stable active medium to induce reversible plasmonic modulations of embedded metal nanostructures. A dense monolayer of silver nanocubes was deposited on a quartz substrate using the Langmuir-Blodgett technique and subsequently coated with an ultrathin Azo-POSS layer. The reversible light-induced photoisomerization between the trans and cis states of the azobenzene-terminated branched POSS material results in significant changes in the refractive index (up to 0.17) at a wavelength of 380 nm. We observed that the pronounced and reversible change in the surrounding refractive index results in a corresponding hypsochromic plasmonic shift of 6 nm in the plasmonic band of the embedded silver nanocubes. The reversible tuning of the plasmonic modes of noble-metal nanostructures using a variable-refractive-index medium opens up the possibility of fabricating photoactive, hybrid, ultrathin coatings with robust, real-time, photoinitiated responses for prospective applications in photoactive materials that can be reversibly tuned by light illumination.

KEYWORDS:

azobenzene conjugates; photoisomerization; plasmonic phenomena; polyhedral oligomeric silsesquioxane

PMID:
25671557
DOI:
10.1021/am508993z

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