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篇目详细内容 |
【篇名】 |
Chemical sensing based on the plasmonic response of nanoparticle aggregation: Anion sensing in nanoparticles stabilized by amino-functional ionic liquid |
【刊名】 |
Frontiers of Physics in China |
【刊名缩写】 |
Front. Phys. China |
【ISSN】 |
1673-3487 |
【EISSN】 |
1673-3606 |
【DOI】 |
10.1007/s11467-010-0004-z |
【出版社】 |
Higher Education Press and Springer-Verlag Berlin
Heidelberg |
【出版年】 |
2010 |
【卷期】 |
5
卷3期 |
【页码】 |
330-336
页,共
7
页 |
【作者】 |
Aitzol GARCIA-ETXARRI;
Javier AIZPURUA;
Jon MOLINA-ALDAREGUIA;
Rebeca MARCILLA;
Jose Adolfo
POMPOSO;
David MECERREYES;
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【关键词】 |
ionic liquids; metallic nanoparticles; surface plasmons; anion sensor |
【摘要】 |
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. |
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