Extinction Coefficient of Gold Nanostars
Name
dePuig JPC manuscript 2.pdf
Description
Main Article
Size
1.78 MB
Format
Adobe PDF
Checksum (MD5)
a8b43e3e9476929ff0f5abdf3dac1ef3
Author(s)
Gehrke, Lee
de Puig Guixe, Helena
Tam, Justina
Yen, Chun-Wan
Hamad-Schifferli, Kimberly
Date Issued
July 2015
Journal
The Journal of Physical Chemistry C
Publisher
American Chemical Society (ACS)
Citation
de Puig, Helena; Tam, Justina O.; Yen, Chun-Wan; Gehrke, Lee and Hamad-Schifferli, Kimberly. "Extinction Coefficient of Gold Nanostars." The Journal of Physical Chemistry C 119, no. 30 (July 2015):17408–17415. © 2015 American Chemical Society
Version
Author's final manuscript
Abstract
Gold nanostars (NStars) are highly attractive for biological applications due to their surface chemistry, facile synthesis, and optical properties. Here, we synthesize NStars in HEPES buffer at different HEPES/Au ratios, producing NStars of different sizes and shapes and therefore varying optical properties. We measure the extinction coefficient of the synthesized NStars at their maximum surface plasmon resonances (SPRs), which range from 5.7 × 10⁸ to 26.8 × 10⁸ M⁻¹ cm⁻¹. Measured values correlate with those obtained from theoretical models of the NStars using the discrete dipole approximation (DDA), which we use to simulate the extinction spectra of the nanostars. Finally, because NStars are typically used in biological applications, we conjugate DNA and antibodies to the NStars and calculate the footprint of the bound biomolecules.
MIT Department
Massachusetts Institute of Technology. Institute for Medical Engineering & Science
Massachusetts Institute of Technology. Department of Mechanical Engineering
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1021/acs.jpcc.5b03624
