Engraving High-Density Nanogaps in Gold Thin Films via Sequential Anodization and Reduction for Surface-Enhanced Raman Spectroscopy Applications

Cited 2 time in webofscience Cited 0 time in scopus
  • Hit : 109
  • Download : 0
To realize a more rapid and accurate detection technique for diverse trace molecules, surface-enhanced Raman scattering (SERS) analysis has been extensively investigated in recent decades. However, a practical fabrication method to scalably and reproducibly produce SERS substrates with highly effective SERS-active sites and extensive optical tunability still remains an important research target. Here, we present an electrochemical pathway to generate a high-performance SERS substrate. This method provides not only ultrahigh-density hot spots as a form of nanogaps for strong and uniform SERS signal enhancement but also tunable plasmonic properties for capability of matching the plasmonic resonance wavelength with that of the Raman excitation laser. The unique Au nanopillar array decorated with ultrafine Au nanoparticles records a high SERS signal enhancement effect, which enables trace-molecule detection on the entire measured area with highly reproducible signal intensity. Also, via aptamer-functionalization on this substrate, an extremely sensitive and highly selective SERS-based Hg2+ ions detection sensor is demonstrated. Trace-amount (10 ppb) Hg2+ ions can be selectively identified in a mixture solution containing six different metallic ion species as well as in a beverage containing numerous other components.
Publisher
AMER CHEMICAL SOC
Issue Date
2018-09
Language
English
Article Type
Article
Keywords

SUB-5 NM GAPS; CO2 REDUCTION; NANOPILLAR ARRAYS; AU NANOSTRUCTURES; SILVER ELECTRODE; SERS PERFORMANCE; OXIDE LAYERS; BASE-PAIRS; HG-II; SCATTERING

Citation

CHEMISTRY OF MATERIALS, v.30, no.17, pp.6183 - 6191

ISSN
0897-4756
DOI
10.1021/acs.chemmater.8b02995
URI
http://hdl.handle.net/10203/246163
Appears in Collection
EE-Journal Papers(저널논문)EEW-Journal Papers(저널논문)MS-Journal Papers(저널논문)
Files in This Item
There are no files associated with this item.
This item is cited by other documents in WoS
⊙ Detail Information in WoSⓡ Click to see webofscience_button
⊙ Cited 2 items in WoS Click to see citing articles in records_button

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0