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Get Free AccessThis study demonstrates a method for measuring the optical absorption cross-sections (σ<sub>a</sub>) of Au-Ag nanocages and Au nanorods using photoacoustic (PA) sensing. PA signals are directly proportional to the absorption coefficient (μ<sub>a</sub>) of the nanostructure. For each type of nanostructure, we first obtained μa from the PA signal by benchmarking against a linear calibration curve (PA signal vs. μ<sub>a</sub>) derived from a set of methylene blue solutions with different concentrations. We then calculated σ<sub>a</sub> by dividing the μ<sub>a</sub> by the corresponding concentration of the Au nanostructure. Additionally, we obtained the extinction cross-section (σ<sub>e</sub>, sum of absorption and scattering cross-sections) from the extinction spectrum recorded using a conventional UV-vis-NIR spectrometer. From the measurements of σ<sub>a</sub> and σ<sub>e</sub>, we were able to easily derive both the absorption and scattering cross-sections for each type of gold nanostructure. This method can potentially provide the optical absorption and scattering properties of gold nanostructures and other types of nanomaterials.
Chulhong Kim, Eun Chul Cho, Fei Zhou, Claire M. Cobley, Kwang Hyun Song, Jingyi Chen, Zhi-Yuhan Li, Younan Xia, Lihong V. Wang (2010). Photoacoustic quantification of the optical absorption cross-sections of gold nanostructures. , 7564, DOI: https://doi.org/10.1117/12.843554.
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Type
Article
Year
2010
Authors
9
Datasets
0
Total Files
0
Language
en
DOI
https://doi.org/10.1117/12.843554
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