Gold nanorods as plasmonic nanotransducers: Distance-dependent refractive index sensitivity

Limei Tian, Enze Chen, Naveen Gandra, Abdennour Abbas, Srikanth Singamaneni

Research output: Contribution to journalArticlepeer-review

82 Scopus citations

Abstract

Owing to the facile tunability of the localized surface plasmon resonance wavelength (LSPR) and large refractive index sensitivity, gold nanorods (AuNR) are of high interest as plasmonic nanotransducers for label-free biological sensing. We investigate the influence of gold nanorod dimensions on distance-dependent LSPR sensitivity and electromagnetic (EM) decay length using electrostatic layer-by-layer (LbL) assembly of polyelectrolytes. The electromagnetic decay length was found to increase linearly with both nanorod length and diameter, although to variable degrees. The rate of EM decay length increase with nanorod diameter is significantly higher compared to that of the length, indicating that diameter is a convenient handle to tune the EM decay length of gold nanorods. The ability to precisely measure the EM decay length of nanostructures enables the rational selection of plasmonic nanotransducer dimensions for the particular biosensing application.

Original languageEnglish (US)
Pages (from-to)17435-17442
Number of pages8
JournalLangmuir
Volume28
Issue number50
DOIs
StatePublished - Dec 18 2012

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