Characterization of the role of oxide spacers in multilayer-enhanced SERS probes

dc.contributor.authorStrobbia, Pietro
dc.contributor.authorHenegar, Alex
dc.contributor.authorGougousi, Theodosia
dc.contributor.authorCullum, Brian
dc.date.accessioned2024-09-04T19:58:45Z
dc.date.available2024-09-04T19:58:45Z
dc.date.issued2015-05-13
dc.descriptionSPIE Sensing Technology + Applications, 20-24 APRIL 2015, Baltimore, MD, United States
dc.description.abstractSurface enhanced Raman spectroscopy (SERS) has several advantages as a transduction method for many types of optical sensors, due to its sensitivity and potential for multiplexed detection. Over the years, SERS probes have been developed to be capable of extreme sensitivities, with single molecule SERS having been achieved in randomly located hot-spots of colloidal aggregates. However, these structures suffer from significant irreproducibility, due to the randomness of the aggregation. Alternatively, strategies such as ordered 2D arrays or enhancement based on single probes (e.g. immunno-nanosensors, nanostars) have high reproducibilities but limited enhancement factors. In our laboratory a widely applicable enhancing geometry based on metal thin films interleaved with dielectric spacers that takes advantage of interaction into the volume of the probe (perpendicularly to the surface) to enhance the signal independently from the underlying structure has been developed. Preliminary evidence into the mechanism of this enhancement suggests that the dielectric spacer material and thickness play a key role in the magnitude of the resulting enhancement. In this paper we investigate the thickness dependence of the multilayer enhancement using substrates fabricated using ultrathin oxide deposited by atomic layer deposition as spacers. The SERS enhancement measured for substrates based on semiconductor and dielectric materials have been characterized in order to understand the origin of this dependence. In addition a model to describe the mechanism by which the spacer properties influence the multilayer enhancement will also be discussed.
dc.description.urihttps://www.spiedigitallibrary.org/conference-proceedings-of-spie/9487/94870P/Characterization-of-the-role-of-oxide-spacers-in-multilayer-enhanced/10.1117/12.2177467.full
dc.format.extent8 pages
dc.genreconference papers and proceedings
dc.identifierdoi:10.13016/m2ewto-bqsl
dc.identifier.citationStrobbia, Pietro, Alex Henegar, Theodosia Gougousi, and Brian M. Cullum. “Characterization of the Role of Oxide Spacers in Multilayer-Enhanced SERS Probes.” In Smart Biomedical and Physiological Sensor Technology XII, 9487:76–83. SPIE, 2015. https://doi.org/10.1117/12.2177467.
dc.identifier.urihttps://doi.org/10.1117/12.2177467
dc.identifier.urihttp://hdl.handle.net/11603/35994
dc.language.isoen_US
dc.publisherSPIE
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Faculty Collection
dc.relation.ispartofUMBC Chemistry & Biochemistry Department
dc.relation.ispartofUMBC Student Collection
dc.relation.ispartofUMBC Physics Department
dc.rights©2015 Society of Photo-Optical Instrumentation Engineers (SPIE).
dc.titleCharacterization of the role of oxide spacers in multilayer-enhanced SERS probes
dc.typeText
dcterms.creatorhttps://orcid.org/0000-0003-0884-6185
dcterms.creatorhttps://orcid.org/0000-0001-6396-9706
dcterms.creatorhttps://orcid.org/0000-0002-5250-8290

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