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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 3 — Feb. 11, 2013
  • pp: 2987–3000

Fast statistical measurement of aspect ratio distribution of gold nanorod ensembles by optical extinction spectroscopy

Ninghan Xu, Benfeng Bai, Qiaofeng Tan, and Guofan Jin  »View Author Affiliations

Optics Express, Vol. 21, Issue 3, pp. 2987-3000 (2013)

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Fast and accurate geometric characterization and metrology of noble metal nanoparticles such as gold nanorod (NR) ensembles is highly demanded in practical production, trade, and application of nanoparticles. Traditional imaging methods such as transmission electron microscopy (TEM) need to measure a sufficiently large number of nanoparticles individually in order to characterize a nanoparticle ensemble statistically, which are time-consuming and costly, though accurate enough. In this work, we present the use of optical extinction spectroscopy (OES) to fast measure the aspect ratio distribution (which is a critical geometric parameter) of gold NR ensembles statistically. By comparing with the TEM results experimentally, it is shown that the mean aspect ratio obtained by the OES method coincides with that of the TEM method well if the other NR structural parameters are reasonably pre-determined, while the OES method is much faster and of more statistical significance. Furthermore, the influences of these NR structural parameters on the measurement results are thoroughly analyzed and the possible measures to improve the accuracy of solving the ill-posed inverse scattering problem are discussed. By using the OES method, it is also possible to determine the mass-volume concentration of NRs, which is helpful for improving the solution of the inverse scattering problem while is unable to be obtained by the TEM method.

© 2013 OSA

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(290.3200) Scattering : Inverse scattering
(290.5850) Scattering : Scattering, particles
(160.4236) Materials : Nanomaterials

ToC Category:
Optics at Surfaces

Original Manuscript: November 27, 2012
Revised Manuscript: January 18, 2013
Manuscript Accepted: January 21, 2013
Published: January 31, 2013

Virtual Issues
Vol. 8, Iss. 3 Virtual Journal for Biomedical Optics

Ninghan Xu, Benfeng Bai, Qiaofeng Tan, and Guofan Jin, "Fast statistical measurement of aspect ratio distribution of gold nanorod ensembles by optical extinction spectroscopy," Opt. Express 21, 2987-3000 (2013)

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