Event Title

pH-Responsive Surface-Enhanced Raman Scattering Substrates

Co-Author(s)

Alyson King, David Rider, Steven Emory

Research Mentor(s)

Steven Emory

Description

Surface-enhanced Raman spectroscopy (SERS) is a spectroscopic technique used to analyze the interactions between compounds in simple and complex mixtures. Highly specific, the SERS effect arises from the enhancement of the Raman scattering cross section of molecules adsorbed to roughened metal surfaces. Many factors influence the SERS enhancement including metal type, surface roughness, nanoparticle (NP) morphology, distance between adjacent NPs, and the orientation and distance between adsorbate molecule and the NP’s surface. Dynamically tunable SERS substrates are of particular interest. In this work, the synthesis of monodisperse microgels with pH-tunable swelling characteristics is explored in an effort to create a tunable and pH-responsive substrate for SERS-active Au and Ag NPs. Random co-polymers of styrene and 2-vinylpyridine, which are sterically stabilized and covalently cross-linked, were synthesized. Au and Ag NPs were loaded onto the surface of these polymer nanostructures and the pH-responsive SERS activity was measured.

Document Type

Event

Start Date

16-5-2018 9:00 AM

End Date

16-5-2018 12:00 PM

Location

Chemistry

Rights

Copying of this document in whole or in part is allowable only for scholarly purposes. It is understood, however, that any copying or publication of this document for commercial purposes, or for financial gain, shall not be allowed without the author’s written permission.

Language

English

Format

application/pdf

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May 16th, 9:00 AM May 16th, 12:00 PM

pH-Responsive Surface-Enhanced Raman Scattering Substrates

Chemistry

Surface-enhanced Raman spectroscopy (SERS) is a spectroscopic technique used to analyze the interactions between compounds in simple and complex mixtures. Highly specific, the SERS effect arises from the enhancement of the Raman scattering cross section of molecules adsorbed to roughened metal surfaces. Many factors influence the SERS enhancement including metal type, surface roughness, nanoparticle (NP) morphology, distance between adjacent NPs, and the orientation and distance between adsorbate molecule and the NP’s surface. Dynamically tunable SERS substrates are of particular interest. In this work, the synthesis of monodisperse microgels with pH-tunable swelling characteristics is explored in an effort to create a tunable and pH-responsive substrate for SERS-active Au and Ag NPs. Random co-polymers of styrene and 2-vinylpyridine, which are sterically stabilized and covalently cross-linked, were synthesized. Au and Ag NPs were loaded onto the surface of these polymer nanostructures and the pH-responsive SERS activity was measured.