Development of SAM-based multi-layer SERS substrates for intracellular analyses

Charles K. Klutse; Brian M. Cullum

doi:10.1117/12.848534

23 April 2010 Development of SAM-based multi-layer SERS substrates for intracellular analyses

Charles K. Klutse, Brian M. Cullum

Proceedings Volume 7674, Smart Biomedical and Physiological Sensor Technologies VII; 767402 (2010) https://doi.org/10.1117/12.848534
Event: SPIE Defense, Security, and Sensing, 2010, Orlando, Florida, United States

Abstract

Surface-enhanced Raman scattering (SERS) is a powerful tool for intracellular analyses due its minimally invasive nature and molecular specificity. This research focuses on optimizing the sensitivity of SERS in order to widely apply it to the detection of ultra-trace biomolecules within individual living cells. Recent results have shown that large SERS enhancement factors (EF) can be achieved with multi-layer SERS substrates. To fabricate multi-layer SERS substrates, alternating layers of metal films and dielectric spacers are cast over a non-confluent monolayer of nanostructures. Individual particles of these substrates are then immobilized with antibodies to develop SERS-based immuno-nanosensors. The multi-layer SERS EFs can be increased by the use of appropriate dielectric spacer to fabricate the substrates. To further understand the effect of dielectric spacers on the multi-layer SERS EFs, this talk discusses the characterization of the SERS enhancements of multi-layer metal film on nanostructure SERS substrates fabricated with self-assembled monolayer (SAM) spacers. Monolayers with different chain lengths have been systematically capped with varying amount of metal films. It was found that the SERS EFs depend on the nature of the monolayer formed and the amount of metal film deposited on the monolayer. Using optimal SAMs and the appropriate amount of metal film overlayers, SAM multi-layer SERS substrate with optimized SERS intensity can be fabricated. This talk will also explore the functionalization of the SERS substrates with appropriate bio-recognition elements to develop SERS-based immuno-nanosensors.

Citation Download Citation

Charles K. Klutse and Brian M. Cullum "Development of SAM-based multi-layer SERS substrates for intracellular analyses", Proc. SPIE 7674, Smart Biomedical and Physiological Sensor Technologies VII, 767402 (23 April 2010); https://doi.org/10.1117/12.848534

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