The 'lightning' gold nanorods: fluorescence enhancement of over a million compared to the gold metal

TitleThe 'lightning' gold nanorods: fluorescence enhancement of over a million compared to the gold metal
Publication TypeJournal Article
Year of Publication2000
AuthorsMohamed, MB, Volkov, VV, Link, S, EL-Sayed, MA
JournalChemical Physics Letters
Volume317
Pagination517-523
Date PublishedFeb
ISBN Number0009-2614
Accession NumberWOS:000085374100001
Abstract

Gold nanorods capped with micelles and having an aspect ratio of 2.0-5.4 are found to fluoresce with a quantum yield which is over a million times that of the metal. For rods of the same width, the yield is found to increase quadratically while the wavelength maximum increases linearly with the length. We assign this emission to the electron and hole interband recombination. The increase in the emission yield results from the enhancement effect of the incoming and outgoing electric fields via coupling to the surface plasmon resonance in the rods. This is similar to the previously proposed fluorescence and the Raman enhancement on noble metal rough surfaces. (C) 2000 Published by Elsevier Science B.V. All rights reserved.

DOI10.1016/s0009-2614(99)01414-1