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Issue 26, 2018
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Low-energy, nanoparticle reshaping for large-area, patterned, plasmonic nanocomposites

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Abstract

Compliant, robust films with pixelated, voxelated or gradient distribution of plasmonic properties are enabling for technologies from colorimetric sensors, filters, and gradient index optical elements to art. Spatially multiplexing different plasmonic effects, however, is challenging. To address this challenge, we demonstrate a post-film fabrication process that enhances gold nanorod (AuNR) reshaping with chemistry. Mild annealing or broadband non-coherent light sources provide sufficient heating to drive localized redox processes that lead to an isovolumetric reduction of the surface-to-volume ratio of CTAB stabilized AuNRs in polyvinyl alcohol (PVA). Single crystallinity is retained. The reshaping rate in the presence of these redox processes occurs in excess of 100× faster (seconds) than previous reports that utilize increased surface diffusion as temperatures approach the particle melting point (days). Using the process's dependency on reactant concentration, broadband, multi-exposure optical processing preserves particle alignment, enables multi-color patterning, and produces gradients of the longitudinal plasmon resonance of at least 0.01 eV μm−1 (3 nm μm−1).

Graphical abstract: Low-energy, nanoparticle reshaping for large-area, patterned, plasmonic nanocomposites

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Publication details

The article was received on 12 Feb 2018, accepted on 17 Jun 2018 and first published on 18 Jun 2018


Article type: Paper
DOI: 10.1039/C8TC00780B
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J. Mater. Chem. C, 2018,6, 7157-7169

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    Low-energy, nanoparticle reshaping for large-area, patterned, plasmonic nanocomposites

    C. Mahoney, K. Park, A. Jawaid, B. Kowalski, A. Gillman, V. Tondiglia, B. Treml, T. White and R. A. Vaia, J. Mater. Chem. C, 2018, 6, 7157
    DOI: 10.1039/C8TC00780B

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