@article{10902/33618,
year = {2017},
month = {12},
url = {https://hdl.handle.net/10902/33618},
abstract = {Self-assembled nanoparticle (NP) arrays at liquid interfaces provide a unique optical response which has opened the door to new tuneable metamaterials for sensing and optical applications. NPs can spontaneously assemble at a liquid-liquid interface, forming an ordered, self-healing, low-defect 2D film. The close proximity of the NPs at the interface results in collective plasmonic modes with a spectral response dependent on the distance between the NPs and induces large field enhancements within the gaps. In this study, we assembled spherical and rod-shaped gold NPs with the aim of improving our understanding of NP assembly processes at liquid interfaces, working towards finely controlling their structure and producing tailored optical and enhanced Raman signals. We systematically tuned the assembly and spacing between NPs through increasing or decreasing the degree of electrostatic screening with the addition of electrolyte or pH adjustment. The in situ modulation of the nanoparticle position on the same sample allowed us to monitor plasmon coupling and the resulting SERS enhancement processes in real time, with sub-nm precision.},
organization = {The work was in part supported by the Engineering and Physical Sciences Research Council UK, “Electrotuneable Molecular Alarm”, EP/L02098X/1. JBE also acknowledges receipt of ERC starting (NanoP) and consolidator grants (NanoPD). LV acknowledges the support of a MSCA Individual Fellowship. LML-M acknowledges funding from the Spanish MINECO (grant MAT2013-46101-R). The authors would like to acknowledge Viktoria Urland and Binoy Paulose Nadappuram (Imperial College) for the fabrication of glass micro-pipettes.},
publisher = {Royal Society of Chemistry},
publisher = {Faraday Discussions, 2017, 205, 67-83},
title = {Monitoring plasmon coupling and SERS enhancement through: In situ nanoparticle spacing modulation},
author = {Velleman, L. and Scarabelli, Leonardo and Sikdar, D. and Kornyshev, A. A. and Liz Marzán, Luis Manuel and Edel, J. B.},
}