209. SELF-ASSEMBLED NANOCRYSTAL COATINGS ON AFM PROBES FOR THE PREPARATION OF TIP-ENHANCED RAMAN SPECTROSCOPY TIPS

Department: NanoEngineering
Faculty Advisor(s): Andrea Tao

Primary Student
Name: Tyler Jamison Dill
Email: tdill@ucsd.edu
Phone: 858-822-0241
Grad Year: 2016

Abstract
Tip-enhanced Raman spectroscopy (TERS) is a vibrational mode characterization technique that combines the sensitivity of surface-enhanced Raman spectroscopy (SERS) with the lateral resolution of scanning probe microscopy (SPM). Surface plasmons at the apex of a metal SPM probe allow for a localized high Raman signal, giving a high-resolution surface chemical map. Using Langmuir-Blodgett films, we present a novel way to coat standard AFM tips with silver and gold nanocrystals in order to make the apices plasmonically active. By varying the shape, size, and material of the nanocrystals, the plasmonic resonances can be tuned. Additionally, these particles can be stripped and the tips recoated for multiple uses or different TERS applications. We anticipate that this method will provide an inexpensive and simple way to mass-produce reusable TERS tips.

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