Advanced Large-Scale Nanofabrication Route for Ultrasensitive SERS Platforms Based on Precisely Shaped Gold Nanostructures

One of the key issues for SERS-based trace applications is engineering structurally uniform substrates with ultrasensitivity, stability, and good reproducibility. A label-free, cost-effective, and reproducible fabrication strategy of ultrasensitive SERS sensors was reported in this work. Herein, we...

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Bibliographic Details
Published in:Nanomaterials (Basel, Switzerland) Switzerland), 2021-07, Vol.11 (7), p.1806
Main Authors: Akil, Suzanna, Omar, Rana, Kuznetsov, Dmitry, Shur, Vladimir, En Naciri, Aotmane, Jradi, Safi
Format: Article
Language:English
Subjects:
advanced nanocomposites
Engineering Sciences
Evolution
Fabrication
Gold
Investigations
large area
Micro and nanotechnologies
Microelectronics
Microscopy
Morphology
Nanocrystals
Nanofabrication
Nanoparticles
Reproducibility
Seeds
Selective adsorption
Self-assembly
sensors
Shape control
Silicon wafers
Silver
Solvents
Substrates
Surfactants
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Summary:One of the key issues for SERS-based trace applications is engineering structurally uniform substrates with ultrasensitivity, stability, and good reproducibility. A label-free, cost-effective, and reproducible fabrication strategy of ultrasensitive SERS sensors was reported in this work. Herein, we present recent progress in self-assembly-based synthesis to elaborate precisely shaped and abundant gold nanoparticles in a large area. We demonstrated that shape control is driven by the selective adsorption of a cation (Na+, K+, and H+) on a single facet of gold nanocrystal seeds during the growth process. We studied SERS features as a function of morphology. Importantly, we found a correlation between the shape and experimental SERS enhancement factors. We observed a detection threshold of 10−20 M of bipyridine ethylene (BPE), which matches the lowest value determined in literature for BPE until now. Such novel sensing finding could be very promising for diseases and pathogen detection and opens up an avenue toward predicting which other morphologies could offer improved sensitivity.
ISSN:2079-4991
2079-4991
DOI:10.3390/nano11071806