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One-step synthesis of a monolayer of monodisperse gold nanocubes for SERS substrates

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Abstract

Here, we report for the first time a facile and fast one-step strategy to fabricate monodisperse gold nanocubes (GNCs) by spin-coating a gold precursor-loaded PMMA dispersion on N-doped silicon. A vapor induced phase separation allows PMMA self-assembly into a nanoporous film including the GNCs in its holes. Control of size and shape until obtaining monodisperse GNCs was achieved by tailoring the concentration of the gold precursor. Upon increasing this concentration, the optical properties of the GNCs such as the surface plasmon resonance has been red-shifted from 540 to 650 nm, in relation to the strong interaction between closely separated GNCs, increase in their number and PMMA thickness on the substrate surface. Therefore, the high density of hotspots in the gaps between closely spaced GNCs led to the sensitive detection of pyridine with an unprecedented SERS threshold of detection of 10−12 M. SERS experiments revealed the high chemical enhancement and allowed few molecule detection without any surface modification of the GNCs.

Graphical abstract: One-step synthesis of a monolayer of monodisperse gold nanocubes for SERS substrates

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Publication details

The article was received on 10 Jul 2017, accepted on 21 Sep 2017 and first published on 22 Sep 2017


Article type: Paper
DOI: 10.1039/C7TC03069J
Citation: J. Mater. Chem. C, 2017, Advance Article
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    One-step synthesis of a monolayer of monodisperse gold nanocubes for SERS substrates

    R. Omar, A. En Naciri, S. Jradi, Y. Battie, J. Toufaily, H. Mortada and S. Akil, J. Mater. Chem. C, 2017, Advance Article , DOI: 10.1039/C7TC03069J

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