Chemical sensing based on the plasmonic response
of nanoparticle aggregation: Anion sensing in nanoparticles stabilized
by amino-functional ionic liquid

doi:10.1007/s11467-010-0004-z

Front. Phys.

2010, Vol. 5

Issue (3) : 330-336 https://doi.org/10.1007/s11467-010-0004-z

Research articles

Chemical sensing based on the plasmonic response of nanoparticle aggregation: Anion sensing in nanoparticles stabilized by amino-functional ionic liquid

Aitzol GARCIA-ETXARRI¹,Javier AIZPURUA¹,Jon MOLINA-ALDAREGUIA²,Rebeca MARCILLA³,David MECERREYES³,Jose Adolfo POMPOSO⁴,

1.Donostia International Physics Center DIPC, Paseo Manuel de Lardizabal 4, 20018 Donostia-San Sebastián, Spain；Centro de Física de Materiales, Centro Mixto CSIC-UPV/EHU, Centro Korta, Avenida de Tolosa 72, 20018 Donostia-San Sebastián, Spain; 2.CEIT–Centro de Estudios e Investigaciones Tecnicas de Gipuzkoa, Paseo Manuel de Lardizabal 15, 20018 Donostia-San Sebastian, Spain；IMDEA Materials, E. T. S. de Ingenieros de Caminos, c/Profesor Aranguren, s/n, 28040 Madrid, Spain; 3.CIDETEC–Centre for Electrochemical Technologies, Parque Tecnológico de San Sebastian, Paseo Miramon 196, 20009 Donostia-San Sebastian, Spain; 4.CIDETEC–Centre for Electrochemical Technologies, Parque Tecnológico de San Sebastian, Paseo Miramon 196, 20009 Donostia-San Sebastian, Spain；Donostia International Physics Center DIPC, Paseo Manuel de Lardizabal 4, 20018 Donostia-San Sebastián, Spain;

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Abstract We report the synthesis, characterization and modellization of optical anion sensors based on gold nanoparticles (Au NPs) stabilized by amino-functional imidazolium ionic liquids (AFIL). The addition of different salts results in anion exchange of the imidazolium ionic liquid stabilizer leading to a change in the optical response of the original nanoparticle aqueous solution. In all cases except with dodecylbenzenesulfonic acid sodium salt, a sufficient amount of salt concentration (5 times larger than equimolar) leads to the appearance of an absorption band between 600 and 700 nm in the ultravioletvisible (UV-vis) spectrum. The presence of the salt produces aggregation of the particles that localise the optical response and produce a large spectral red shift. Transmission electron microscopy images demonstrated that this optical change was due to the aggregation of the nanoparticles. We simulate the optical response of both situations, before and after salt addition, and interpret the experimental observations in terms of the different response of metallic single nanoparticles and nanoparticle aggregates. Theoretical calculations for single nanoparticle and single nanoparticle dimers demonstrate that the colour change is not due to the enlargement or structural changes of the Au NPs, but due to the formation of NP aggregation. These results show the potential of nanoparticle plasmonics to perform effective chemical sensing.

Keywords ionic liquids metallic nanoparticles surface plasmons anion sensor

Issue Date: 05 September 2010

Cite this article:

Aitzol GARCIA-ETXARRI,Jon MOLINA-ALDAREGUIA,Javier AIZPURUA, et al. Chemical sensing based on the plasmonic response of nanoparticle aggregation: Anion sensing in nanoparticles stabilized by amino-functional ionic liquid[J]. Front. Phys. , 2010, 5(3): 330-336.

URL:

https://academic.hep.com.cn/fop/EN/10.1007/s11467-010-0004-z
https://academic.hep.com.cn/fop/EN/Y2010/V5/I3/330

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