Optical properties of polydopamine-coated Au nanorods

Polydopamine-coated Au nanorods (AuNRs) have attracted a great interest for various biomedical applications. Polydopamine (PDA) is a light absorbing biopolymer with nonzero imaginary part of the refractive index, which exerts a significant effect on the optical properties of PDA-coated AuNRs. In this paper, we study the changes in plasmonic properties of AuNRs after PDA coating. We observed that the longitudinal plasmon resonance decreases while the transversal one increases. To confirm the experimental observations, we performed theoretical simulations of the extinction and scattering spectra for AuNRs with different geometrical properties, PDA shell thickness and refractive index. The loss of plasmonic peak intensity becomes higher as the axial ratio of the AuNRs or the imaginary part of the refractive index of PDA increase.

[1]  Lehui Lu,et al.  Polydopamine and its derivative materials: synthesis and promising applications in energy, environmental, and biomedical fields. , 2014, Chemical reviews.

[2]  Lei Tao,et al.  Recent developments in polydopamine: an emerging soft matter for surface modification and biomedical applications. , 2016, Nanoscale.

[3]  Haeshin Lee,et al.  Polydopamine Surface Chemistry: A Decade of Discovery. , 2018, ACS applied materials & interfaces.

[4]  Chia-Che Ho,et al.  Structure, properties and applications of mussel-inspired polydopamine. , 2014, Journal of biomedical nanotechnology.

[5]  Takuro Niidome,et al.  PEG-modified gold nanorods with a stealth character for in vivo applications. , 2006, Journal of controlled release : official journal of the Controlled Release Society.

[6]  R. Glickman,et al.  Optical characterization of melanin. , 2000, Journal of biomedical optics.

[7]  A. Quirantes,et al.  A T-matrix method and computer code for randomly oriented, axially symmetric coated scatterers , 2005 .

[8]  C. Murray,et al.  Using binary surfactant mixtures to simultaneously improve the dimensional tunability and monodispersity in the seeded growth of gold nanorods. , 2013, Nano letters.

[9]  M. Floren,et al.  Mussel-inspired polydopamine for bio-surface functionalization , 2016, Biosurface and biotribology.

[10]  Mostafa A. El-Sayed,et al.  Preparation and Growth Mechanism of Gold Nanorods (NRs) Using Seed-Mediated Growth Method , 2003 .

[11]  Allen Taflove,et al.  Computational Electrodynamics the Finite-Difference Time-Domain Method , 1995 .

[12]  B. Draine,et al.  Discrete-dipole approximation for periodic targets: theory and tests. , 2008, Journal of the Optical Society of America. A, Optics, image science, and vision.

[13]  Haeshin Lee,et al.  Mussel-Inspired Surface Chemistry for Multifunctional Coatings , 2007, Science.

[14]  S. Jacques,et al.  THE MELANOSOME: THRESHOLD TEMPERATURE FOR EXPLOSIVE VAPORIZATION AND INTERNAL ABSORPTION COEFFICIENT DURING PULSED LASER IRRADIATION , 1991, Photochemistry and photobiology.

[15]  R. Vaia,et al.  Optical Properties of Rodlike Metallic Nanostructures: Insight from Theory and Experiment , 2009 .

[16]  C. H. J. Choi,et al.  Polydopamine-based concentric nanoshells with programmable architectures and plasmonic properties. , 2017, Nanoscale.

[17]  Boris N. Khlebtsov,et al.  Overgrowth of gold nanorods by using a binary surfactant mixture. , 2014, Langmuir : the ACS journal of surfaces and colloids.

[18]  T. Taniguchi,et al.  Biomimetic non-iridescent structural color materials from polydopamine black particles that mimic melanin granules , 2015 .

[19]  V. Farafonov,et al.  Light scattering by a core-mantle spheroidal particle. , 1996, Applied optics.

[20]  M. S. Prokopjeva,et al.  Light scattering by multilayered nonspherical particles: a set of methods , 2003 .

[21]  Lei Zhang,et al.  Wavelength-dependent optical properties of melanosomes in retinal pigmented epithelium and their changes with melanin bleaching: a numerical study. , 2017, Biomedical optics express.

[22]  Hao Zhang,et al.  Fe3O4@polydopamine Composite Theranostic Superparticles Employing Preassembled Fe3O4 Nanoparticles as the Core. , 2016, ACS applied materials & interfaces.

[23]  W. Tsai,et al.  Poly(dopamine) coating of scaffolds for articular cartilage tissue engineering. , 2011, Acta biomaterialia.

[24]  D. Stavenga,et al.  High refractive index of melanin in shiny occipital feathers of a bird of paradise , 2015, Light: Science & Applications.

[25]  R. W. Christy,et al.  Optical Constants of the Noble Metals , 1972 .

[26]  W. Steen.  Absorption and Scattering of Light by Small Particles , 1999 .

[27]  Nikolai G. Khlebtsov,et al.  Spectral Extinction of Colloidal Gold and Its Biospecific Conjugates , 1996 .

[28]  M. Gao,et al.  Surface-enhanced Raman scattering (SERS) imaging-guided real-time photothermal ablation of target cancer cells using polydopamine-encapsulated gold nanorods as multifunctional agents , 2017, Analytical and Bioanalytical Chemistry.