Imperial College London

Professor Joshua B. Edel

Faculty of Natural SciencesDepartment of Chemistry

Professor of Biosensing & Analytical Sciences



+44 (0)20 7594 0754joshua.edel Website




Mr John Murrell +44 (0)20 7594 2845




442AChemistrySouth Kensington Campus






BibTex format

author = {Freedman, KJ and Crick, CR and Albella, P and Barik, A and Ivanov, AP and Maier, SA and Oh, SH and Edel, JB},
doi = {10.1021/acsphotonics.6b00119},
journal = {ACS Photonics},
pages = {1036--1044},
title = {On-Demand Surface and Tip Enhanced Raman Spectroscopy Using Dielectrophoretic Trapping and Nanopore Sensing},
url = {},
volume = {3},
year = {2016}

RIS format (EndNote, RefMan)

AB - 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.
AU - Freedman,KJ
AU - Crick,CR
AU - Albella,P
AU - Barik,A
AU - Ivanov,AP
AU - Maier,SA
AU - Oh,SH
AU - Edel,JB
DO - 10.1021/acsphotonics.6b00119
EP - 1044
PY - 2016///
SN - 2330-4022
SP - 1036
TI - On-Demand Surface and Tip Enhanced Raman Spectroscopy Using Dielectrophoretic Trapping and Nanopore Sensing
T2 - ACS Photonics
UR -
UR -
VL - 3
ER -