Abstract
In the last decade the use of anisotropic nanoparticles in analytical and bioanalytical applications has increased substantially. In particular, noble metal nanorods have unique optical properties that have attracted the interest of many research groups. The localized surface plasmon resonance (LSPR) generated by interaction of light at a specific wavelength with noble metal nanoparticles was found to depend on particle size and shape and on the constituting material and the surrounding dielectric solution. Because of their anisotropic shape, nanorods are characterized by two LSPR peaks: the transverse, fixed at approximately 530 nm, and the longitudinal, which is in the visible–near infra-red region of the spectrum and varies with nanorod aspect ratio. The intense surface plasmon band enables nanorods to absorb and scatter light in the visible and near infra-red regions, and fluorescence and two-photon induced luminescence are also observed. These optical properties, with the reactivity towards binding events that induce changes in the refractive index of the surrounding solution, make nanorods a useful tool for tracking binding events in different applications, for example assembly, biosensing, in-vivo targeting and imaging, and single-molecule detection by surface-enhanced Raman spectroscopy. This review presents the promising strategies proposed for functionalizing gold nanorods and their successful use in a variety of analytical and biomedical applications.
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Acknowledgements
This work has been supported by the Ministry of Science and Innovation (contract number DEP2007-73224-C03-01) and by ENIAC Joint Undertaking Action (ENIAC-2010-120215). The AMR group is a Grup de Recerca de la Generalitat de Catalunya and has support from the Departament d’Universitats, Recerca i Societat de la Informació la Generalitat de Catalunya (expedient 2009 SGR 1343). CIBER-BBN is an initiative funded by the VI National R&D&I Plan 2008-2011, Iniciativa Ingenio 2010, Consolider Program, CIBER Actions and financed by the Instituto de Salud Carlos III with assistance from the European Regional Development Fund. Ilaria Mannelli thanks the JAE-doc action, founded by Junta para la Ampliación de Estudios e Investigaciones Científicas.
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Published in the special issue on Focus on Bioanalysis with Guest Editors Antje J. Baeumner, Günter Gauglitz and Frieder W. Scheller.
An erratum to this article can be found at http://dx.doi.org/10.1007/s00216-010-4590-y
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Mannelli, I., Marco, MP. Recent advances in analytical and bioanalysis applications of noble metal nanorods. Anal Bioanal Chem 398, 2451–2469 (2010). https://doi.org/10.1007/s00216-010-3937-8
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DOI: https://doi.org/10.1007/s00216-010-3937-8