Self-assembled nanoparticle arrays for multiphase trace analyte detection.


Nanoplasmonic structures designed for trace analyte detection using surface-enhanced Raman spectroscopy typically require sophisticated nanofabrication techniques. An alternative to fabricating such substrates is to rely on self-assembly of nanoparticles into close-packed arrays at liquid/liquid or liquid/air interfaces. The density of the arrays can be controlled by modifying the nanoparticle functionality, pH of the solution and salt concentration. Importantly, these arrays are robust, self-healing, reproducible and extremely easy to handle. Here, we report on the use of such platforms formed by Au nanoparticles for the detection of multi-analytes from the aqueous, organic or air phases. The interfacial area of the Au array in our system is ≈25 mm(2) and can be made smaller, making this platform ideal for small-volume samples, low concentrations and trace analytes. Importantly, the ease of assembly and rapid detection make this platform ideal for in-the-field sample testing of toxins, explosives, narcotics or other hazardous chemicals.

DOI: 10.1038/nmat3488

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@article{Cecchini2013SelfassembledNA, title={Self-assembled nanoparticle arrays for multiphase trace analyte detection.}, author={Michael P. Cecchini and Vladimir A Turek and Jack Paget and Alexei A. Kornyshev and Joshua B Edel}, journal={Nature materials}, year={2013}, volume={12 2}, pages={165-71} }