Measuring the optical absorption cross sections of Au-Ag nanocages and au nanorods by photoacoustic imaging

Eun Chul Cho, Chulhong Kim, Fei Zhou, Claire M. Cobley, Kwang Hyun Song, Jingyi Chen, Zhi Yuhan Li, Lihong V. Wang, Younan Xia

Research output: Contribution to journalArticle

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Abstract

This paper presents a method for measuring the optical absorption cross sections (σ a)of Au-Ag nanocages and Au nanorods. The method is based on photoacoustic (PA) imaging, where the detected signal is directly proportional to the absorption coefficient (μ a) of the nanostructure. For each type of nanostructure, we first obtained μ a from the PA signal by benchmarking against a linear calibration curve (PA signal versus μ a) derived from a set of methylene blue solutions with different concentrations. We then calculated σ a by dividing the μ a by the corresponding concentration of the Au nanostructure. Additionally, we obtained the extinction cross section (σ e, sum of absorption and scattering) from the extinction spectrum recorded using a conventional UV-vis-NIR spectrometer. From the measurements of σ a and σ e, we were able to easily derive both the absorption and scattering cross sections for each type of gold nanostructure. The ratios of absorption to extinction obtained from experimental and theoretical approaches agreed well, demonstrating the potential use of this method in determining the optical absorption and scattering properties of gold nanostructures and other types of nanomaterials.

Original languageEnglish (US)
Pages (from-to)9023-9028
Number of pages6
JournalJournal of Physical Chemistry C
Volume113
Issue number21
DOIs
StatePublished - May 28 2009

Fingerprint

Photoacoustic effect
Nanorods
absorption cross sections
Light absorption
nanorods
Nanostructures
extinction
optical absorption
Imaging techniques
gold
Scattering
Gold
methylene blue
scattering
scattering cross sections
absorptivity
spectrometers
Methylene Blue
Benchmarking
Nanostructured materials

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Energy(all)

Cite this

Measuring the optical absorption cross sections of Au-Ag nanocages and au nanorods by photoacoustic imaging. / Cho, Eun Chul; Kim, Chulhong; Zhou, Fei; Cobley, Claire M.; Song, Kwang Hyun; Chen, Jingyi; Li, Zhi Yuhan; Wang, Lihong V.; Xia, Younan.

In: Journal of Physical Chemistry C, Vol. 113, No. 21, 28.05.2009, p. 9023-9028.

Research output: Contribution to journalArticle

Cho, EC, Kim, C, Zhou, F, Cobley, CM, Song, KH, Chen, J, Li, ZY, Wang, LV & Xia, Y 2009, 'Measuring the optical absorption cross sections of Au-Ag nanocages and au nanorods by photoacoustic imaging', Journal of Physical Chemistry C, vol. 113, no. 21, pp. 9023-9028. https://doi.org/10.1021/jp903343p
Cho, Eun Chul ; Kim, Chulhong ; Zhou, Fei ; Cobley, Claire M. ; Song, Kwang Hyun ; Chen, Jingyi ; Li, Zhi Yuhan ; Wang, Lihong V. ; Xia, Younan. / Measuring the optical absorption cross sections of Au-Ag nanocages and au nanorods by photoacoustic imaging. In: Journal of Physical Chemistry C. 2009 ; Vol. 113, No. 21. pp. 9023-9028.
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