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Issue 12, 2013
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Solution-dispersible Au nanocube dimers with greatly enhanced two-photon luminescence and SERS

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Abstract

We report the synthesis of 43-nm diameter Au nanocube dimers by using Ag+ ions as competitive ligands to freeze L-cysteine-induced assembly process of the nanocubes to a desirable stage. Ascribed to the resonant interparticle coupling with an newly arising plasmon band at 710 nm and local field enhancement, the two-photon luminescence intensity of the Au nanocube dimers in solution was over 20 times stronger than that of the monomers in the wavelength range 555–620 nm. Furthermore, by coupling Raman tags onto the nanocube surface, a solution-based surface-enhanced Raman scattering (SERS) of the nanocube dimers had an enhancement factor of over 10 times compared to the isolated nanocubes. To sum up, with high stability in solution and attractive optical properties, the Au nanocube dimers have potential applications in in vivo bio-imaging and solution-based SERS.

Graphical abstract: Solution-dispersible Au nanocube dimers with greatly enhanced two-photon luminescence and SERS

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Publication details

The article was received on 07 Mar 2013, accepted on 27 Mar 2013 and first published on 02 Apr 2013


Article type: Paper
DOI: 10.1039/C3NR01170D
Citation: Nanoscale, 2013,5, 5368-5374
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    Solution-dispersible Au nanocube dimers with greatly enhanced two-photon luminescence and SERS

    X. Liu, S. Liang, F. Nan, Z. Yang, X. Yu, L. Zhou, Z. Hao and Q. Wang, Nanoscale, 2013, 5, 5368
    DOI: 10.1039/C3NR01170D

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