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Issue 69, 2014
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Internal and external morphology-dependent plasmonic resonance in monolithic nanoporous gold nanoparticles

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Abstract

We report morphology-dependent plasmonic resonance in monolithic nanoporous gold nanoparticles with a nanoscale internal porous network produced by the combination of lithographic patterning and dealloying. Timed dealloying and post-dealloying thermal annealing techniques have been employed to precisely control the morphological evolution. We found that prolonged dealloying time caused further pore coarsening to increase by ∼4 nm, whereas thermal annealing induced both pore coalescence and disk shrinkage, which eventually led to pore elimination. Both types of morphological changes caused a blueshift in the major plasmonic extinction band of up to 200 nm, in contrast to the redshift (∼50 nm) observed in semi-infinite NPG thin films. In addition, a greater blueshift was observed in a higher Au atomic content starting alloy. The tunable plasmonic properties have great potential in surface-enhanced spectroscopy and optical sensing.

Graphical abstract: Internal and external morphology-dependent plasmonic resonance in monolithic nanoporous gold nanoparticles

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Publication details

The article was received on 24 May 2014, accepted on 04 Aug 2014 and first published on 04 Aug 2014


Article type: Communication
DOI: 10.1039/C4RA04922E
Author version available: Download Author version (PDF)
Citation: RSC Adv., 2014,4, 36682-36688
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    Internal and external morphology-dependent plasmonic resonance in monolithic nanoporous gold nanoparticles

    J. Zeng, F. Zhao, J. Qi, Y. Li, C. Li, Y. Yao, T. R. Lee and W. Shih, RSC Adv., 2014, 4, 36682
    DOI: 10.1039/C4RA04922E

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