Journal
APPLIED MATERIALS TODAY
Volume 15, Issue -, Pages 67-76Publisher
ELSEVIER
DOI: 10.1016/j.apmt.2018.12.017
Keywords
Au nanorods; Polydopamine; Plasmon resonance; Refractive index
Categories
Funding
- Russian Science Foundation [18-14-00016]
- RFBR [18-52-7803, 17-02-00075]
- Presidium of Russian Academy of Sciences
- Russian Science Foundation [18-14-00016] Funding Source: Russian Science Foundation
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Polydopamine (PDA) coated Au nanorods (AuNRs) have attracted great interest as a convenient platform to construct various multifunctional nanoparticles for theranostic applications. Typically, the formation of a dielectric shell on the surface of plasmonic particles results in an increase in the particle extinction and in a small red shift of the plasmonic peak. However, compared to the well-known coatings such as silica, biopolymers, and polyelectrolytes, polydopamine is light absorbing material in the visual and NIR spectral range. In this paper, we demonstrate, for the first time, unusual changes in plasmonic properties of AuNRs after PDA coating. Namely, the longitudinal plasmon resonance decreases while the transversal one increases compared to the corresponding initial values of bare AuNRs. Remarkably, the increasing and red shifting of the transversal plasmon is similar to the common changes in plasmonic properties of PDA-coated spheres. To confirm the experimental observations, we simulated the extinction, absorption and scattering spectra for AuNRs with different geometrical properties and PDA shell thicknesses by using two literature models for the refractive index of PDA. The decreasing of plasmonic peak intensity became higher with an increase in the AuNR aspect ratio and the imaginary part of PDA refractive index. Our experimental results and simulations provide a new insight into understanding the optical properties of composite plasmonic particles. (C) 2018 Elsevier Ltd. All rights reserved.
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