Porous Substrates for Label-Free Molecular Level Detection of Nonresonant Organic Molecules

We report on the design of practical surface enhanced Raman scattering (SERS) substrate based upon 3D alumina membranes with cylindrical nanopores chemically modified with polyelectrolyte coating and loaded with gold nanoparticle clusters. These substrates allow for a molecular-level, label-free det...

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Veröffentlicht in:	ACS nano 2009-01, Vol.3 (1), p.181-188
Hauptverfasser:	Ko, Hyunhyub, Chang, Sehoon, Tsukruk, Vladimir V
Format:	Artikel
Sprache:	eng
Schlagworte:	Aluminum Oxide - chemistry Chemistry Techniques, Analytical - methods Chemistry, Organic - methods Crystallization - instrumentation Crystallization - methods Electrolytes Explosive Agents Gold - chemistry Materials Testing - instrumentation Materials Testing - methods Metal Nanoparticles - chemistry Nanotechnology - instrumentation Nanotechnology - methods Particle Size Scattering, Radiation Spectrum Analysis, Raman - methods Surface Properties Surface-Active Agents
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Beschreibung
Zusammenfassung:	We report on the design of practical surface enhanced Raman scattering (SERS) substrate based upon 3D alumina membranes with cylindrical nanopores chemically modified with polyelectrolyte coating and loaded with gold nanoparticle clusters. These substrates allow for a molecular-level, label-free detection of common plastic explosive materials (TNT, DNT) down to 5−10 zeptograms or 15−30 molecules and a common liquid explosive (HMTD) down to 1 picogram. Such a sensitive detection of organic molecules by utilizing efficient SERS substrates opens the path for affordable and label-free detection of trace amount of practically important chemical compounds.
ISSN:	1936-0851 1936-086X
DOI:	10.1021/nn800569f