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Probing the Long Range Distance Dependence of Noble Metal Nanoparticles

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Abstract

The localized surface plasmon resonance (LSPR) of noble metal nanoparticles has recently been the subject of extensive studies. Previously, it has been demonstrated that Ag nanotriangles that have been synthesized using nanosphere lithography (NSL) behave as extremely sensitive and selective chemical and biological sensors. The present work reveals information regarding the long range distance dependence of the localized surface plasmon resonance (LSPR) of silver and gold nanoparticles. Multilayer adsorbates based on the interaction of HOOC(CH2)10SH and Cu2+ were assembled onto surface-confined nanoparticles. Measurement of the LSPR extinction peak shift versus number of layers and adsorbate thickness is non-linear and has a sensing range that is dependent on the composition, shape, in-plane width, and out-of-plane height of the nanoparticles. Theoretical modeling confirms and offers a mathematical interpretation of these results. These experiments indicate that the LSPR sensing capabilities of noble metal nanoparticles can be tuned to match the size of biological and chemical analytes by adjusting the aforementioned properties. The optimization of the LSPR nanosensor for a specific analyte will improve an already sensitive nanoparticle-based sensor.

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Acknowledgements

The authors gratefully acknowledge support from the Nanoscale Science and Engineering Initiative of the National Science Foundation under NSF Award Number EEC-0118025. Any opinions, findings and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect those of the National Science Foundation. A. Haes also wishes to acknowledge the American Chemical Society Division of Analytical Chemistry and Dupont for fellowship support.

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Authors and Affiliations

  1. Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois, 60208-3113, U.S.A.

    Amanda J. Haes & Richard P. Van Duyne

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  1. Amanda J. Haes
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  2. Richard P. Van Duyne
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Haes, A.J., Van Duyne, R.P. Probing the Long Range Distance Dependence of Noble Metal Nanoparticles. MRS Online Proceedings Library 789, 211–216 (2003). https://doi.org/10.1557/PROC-789-N16.9

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  • DOI: https://doi.org/10.1557/PROC-789-N16.9

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