Nanoporous Membranes with Mixed Nanoclusters for Raman-Based Label-Free Monitoring of Peroxide Compounds
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- Nanoporous Membranes with Mixed Nanoclusters for Raman-Based Label-Free Monitoring of Peroxide Compounds
- Chang, Sehoon; Ko, Hyunhyub; Singamaneni, Srikanth; Gunawidjaja, Ray; Tsukruk, Vladimir V.)
- 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
- AMER CHEMICAL SOC
- ANALYTICAL CHEMISTRY, v.81, no.14, pp.5740 - 5748
- 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.
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