Gold-silver alloy semi-nanoshell arrays for label-free plasmonic biosensors. Russo, V., Michieli, N., Cesca, T., Scian, C., Silvestri, D., Morpurgo, M., & Mattei, G. NANOSCALE, 9:10117–10125, Royal Society of Chemistry, 2017. ![Gold-silver alloy semi-nanoshell arrays for label-free plasmonic biosensors [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex Nanosphere lithography coupled with reactive ion etching has been used to synthesize hexagonal ordered arrays of Au–Ag bimetallic semi-nanoshells to be used as plasmonic biosensors. The degree of lateral interaction between adjacent semi-nanoshells can be controlled by tailoring the reactive ion etching time in order to boost the global plasmonic properties through the formation of near-field hot-spots, which in turn can improve the sensitivity of the biosensors. To test the efficiency of the proposedsystem as a biosensor, we used an established protocol for the detection of biomolecules (local sensi-tivity), based on the receptor–ligand approach and using the biotin–streptavidin model system. We also tested the sensitivity to a homogeneous change in the refractive index of the buffer over the sensor (bulk sensitivity). Comparing the obtained results to those of an array of nanoprisms, chosen as a benchmark, significantly higher performances both in local and bulk sensitivities have been found, in agreement with electrodynamics simulations based on finite-element methods.
@article{
11577_3243365,
author = {Russo, Valentina and Michieli, Niccolo and Cesca, Tiziana and Scian, Carlo and Silvestri, Davide and Morpurgo, Margherita and Mattei, Giovanni},
title = {Gold-silver alloy semi-nanoshell arrays for label-free plasmonic biosensors},
year = {2017},
publisher = {Royal Society of Chemistry},
journal = {NANOSCALE},
volume = {9},
abstract = {Nanosphere lithography coupled with reactive ion etching has been used to synthesize hexagonal ordered arrays of Au–Ag bimetallic semi-nanoshells to be used as plasmonic biosensors. The degree of lateral interaction between adjacent semi-nanoshells can be controlled by tailoring the reactive ion etching time in order to boost the global plasmonic properties through the formation of near-field hot-spots, which in turn can improve the sensitivity of the biosensors. To test the efficiency of the proposedsystem as a biosensor, we used an established protocol for the detection of biomolecules (local sensi-tivity), based on the receptor–ligand approach and using the biotin–streptavidin model system. We also tested the sensitivity to a homogeneous change in the refractive index of the buffer over the sensor (bulk sensitivity). Comparing the obtained results to those of an array of nanoprisms, chosen as a benchmark, significantly higher performances both in local and bulk sensitivities have been found, in agreement with electrodynamics simulations based on finite-element methods.},
keywords = {Materials Science (all)},
url = {http://www.rsc.org/publishing/journals/NR/Index.asp},
doi = {10.1039/c7nr01982c},
pages = {10117--10125}
}
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