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Ko, Hyunhyub
Functional Nanomaterials & Devices Lab
Research Interests
  • Functional nanomaterials, flexible electronics, electronic skins, wearable sensors

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Nanoporous Membranes with Mixed Nanoclusters for Raman-Based Label-Free Monitoring of Peroxide Compounds

Cited 38 times inthomson ciCited 36 times inthomson ci
Title
Nanoporous Membranes with Mixed Nanoclusters for Raman-Based Label-Free Monitoring of Peroxide Compounds
Author
Chang, SehoonKo, HyunhyubSingamaneni, SrikanthGunawidjaja, RayTsukruk, Vladimir V.)
Keywords
Chemical decomposition; Chemical fragments; Chemical functionality; Current limits; Gold nanorod; Label-free detection; Label-free monitoring; Laser induced; Nanoparticle clusters; Nanoporous membrane; Nanoporous substrate; Nonresonant; Novel design; Optical signatures; Orders of magnitude; Organic molecules; Photo-catalytic; Porous alumina membranes; Raman spectroscopic; Surface-enhanced Raman scattering; Trace amounts
Issue Date
2009-07
Publisher
AMER CHEMICAL SOC
Citation
ANALYTICAL CHEMISTRY, v.81, no.14, pp.5740 - 5748
Abstract
Monitoring trace amounts of peroxide-based molecules is challenging because of the lack of common optical signatures (fluorescence or absorption in UV-vis range) or chemical functionality easily detectable with common routines. To overcome this issue, we suggest a photochemical decomposition approach followed by the analysis of chemical fragments by a fast, sensitive, and reliable Raman spectroscopic method. To facilitate this approach, we employed a novel design of surface-enhanced Raman scattering (SERS)-active nanoporous substrate based on porous alumina membranes decorated with mixed nanoclusters composed of gold nanorods and nanoparticles. The detectable amount of HMTD below 2 pg demonstrated here is about 3 orders of magnitude lower than the current limit of detection. We suggest that laser-induced photocatalytic decomposition onto nanoparticle clusters is critical for achieving label-free detection of unstable and nonresonant organic molecules.
URI
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DOI
10.1021/ac900537d
ISSN
0003-2700
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ECHE_Journal Papers
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