On-Demand Surface and Tip Enhanced Raman Spectroscopy Using Dielectrophoretic Trapping and Nanopore Sensing
File(s)Freedman_Final.docx (12.85 MB)
Accepted version
Author(s)
Type
Journal Article
Abstract
Surface enhanced Raman spectroscopy (SERS) and tip-enhanced Raman Spectroscopy (TERS) have shown great promise in the detection and analysis of trace analytes throughout numerous fields of study. Both SERS and TERS utilize nanoscale plasmonic surface features to increase the intensity of observed Raman signals by many orders of magnitude (> 108). One of the major factors limiting the wider and more routine implementation of the enhanced Raman phenomena, is in the difficulty of forming consistent and reliable plasmonic substrates with well defined “hot-spots”. We address this limitation by designing a platform which can be used for both SERS and TERS respectively. The presented technique allows for rapid, controlled, “on-demand”, and reversible formation of a SERS substrate using dielectrophorisis (DEP) at the end of a nanoscale pipette. This drives gold nanoparticles in solution to concentrate and self-assemble at the tip of the pipette, where analytes can be detected effectively using SERS. An additional benefit of the platform is that the nanopipette containing a nanopore can be used for detection of individual nanoparticles facilitated by the added enhancement originating from the nanopipette tip enhanced signal. Complementing the experimental results are simulations highlighting the mechanism for SERS substrate formation and TERS detection.
Date Issued
2016-05-10
Date Acceptance
2016-05-10
Citation
ACS Photonics, 2016, 3 (6), pp.1036-1044
ISSN
2330-4022
Publisher
American Chemical Society
Start Page
1036
End Page
1044
Journal / Book Title
ACS Photonics
Volume
3
Issue
6
Copyright Statement
This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Photonics, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://dx.doi.org/10.1021/acsphotonics.6b00119
Publication Status
Published