Electrokinetically-Driven Assembly of Gold Colloids into Nanostructures for Surface-Enhanced Raman Scattering
Autor: | Adam Bottomley, Carlos Escobedo, Aristides Docoslis, Kevin G. Stamplecoskie, Hannah Dies, Danielle Lilly Nicholls |
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Jazyk: | angličtina |
Rok vydání: | 2020 |
Předmět: |
surface-enhanced Raman scattering
Materials science Nanostructure metallic nanostructures electrokinetics General Chemical Engineering Nanowire Nanoparticle microelectrodes Nanotechnology Statistics::Other Statistics Article Rhodamine 6G lcsh:Chemistry chemistry.chemical_compound Electrokinetic phenomena symbols.namesake chemistry lcsh:QD1-999 Colloidal gold symbols General Materials Science nanoparticles Raman spectroscopy Raman scattering |
Zdroj: | Nanomaterials, Vol 10, Iss 661, p 661 (2020) Nanomaterials Volume 10 Issue 4 |
ISSN: | 2079-4991 |
Popis: | Surface-enhanced Raman scattering (SERS) enables the highly sensitive detection of (bio)chemical analytes in fluid samples however, its application requires nanostructured gold/silver substrates, which presents a significant technical challenge. Here, we develop and apply a novel method for producing gold nanostructures for SERS application via the alternating current (AC) electrokinetic assembly of gold nanoparticles into two intricate and frequency-dependent structures: (1) nanowires, and (2) branched &ldquo nanotrees&rdquo that create extended sensing surfaces. We find that the growth of these nanostructures depends strongly on the parameters of the applied AC electric field (frequency and voltage) and ionic composition, specifically the electrical conductivity of the fluid. We demonstrate the sensing capabilities of these gold nanostructures via the chemical detection of rhodamine 6G, a Raman dye, and thiram, a toxic pesticide. Finally, we demonstrate how these SERS-active nanostructures can also be used as a concentration amplification device that can electrokinetically attract and specifically capture an analyte (here, streptavidin) onto the detection site. |
Databáze: | OpenAIRE |
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