Affiliation: | 1. NanoBioMedical Centre, Adam Mickiewicz University, Wszechnicy Piastowskiej 3, Poznan, 61-614 Poland
Institut Européen des Membranes, IEM, UMR 5635, University of Montpellier, ENSCM, Centre National De la Recherche Scientifique (CNRS), Montpellier, 34730 France;2. Faculty of Physics, Adam Mickiewicz University, Uniwersytetu Poznańskiego 2, Poznań, 61-614 Poland;3. NanoBioMedical Centre, Adam Mickiewicz University, Wszechnicy Piastowskiej 3, Poznan, 61-614 Poland;4. Faculty of Materials Engineering and Technical Physics, Poznan University of Technology, Piotrowo 3, Poznan, 60-965 Poland;5. Chromatography & Mass Spectrometry Platform, CIC biomaGUNE, Paseo Miramón 182, San Sebastián, 20014 Spain;6. Soft Matter Nanotechnology, Centre for Cooperative Research in Biomaterials (CIC biomaGUNE), Basque Research and Technology Alliance (BRTA), Paseo Miramon 182 C, Donostia-San Sebastian, 20014 Spain;7. Institut Européen des Membranes, IEM, UMR 5635, University of Montpellier, ENSCM, Centre National De la Recherche Scientifique (CNRS), Montpellier, 34730 France
Gulf University for Science and Technology (GUST), Hawalli, 32093 Kuwait |
Abstract: | Localized surface plasmon resonance (LSPRs) shown by gold nanorods (AuNRs) has several applications in photocatalysis, sensing, and biomedicine. The combination of AuNRs with Polydopamine (PDA) shells results in a strong photo-thermal effect, making them appealing nanomaterials for biomedical applications. However, the precise roles and relative contributions of plasmonic effects in gold, and light-to-heat conversion in PDA are still debated. Herein, a hybrid nanoplatform made by an AuNR core surrounded by a polydopamine (PDA) shell is synthesized, and its photocatalytic behavior is studied. Synthesis is based on a seed-mediated growth followed by the further self-polymerization of dopamine hydrochloride (DA) on the surface of the AuNRs, and the effect of the thickness of the PDA shell on the plasmon response of the composite is the main examined parameter. Photocatalytic performance is tested toward Rhodamine 6G (Rh6G), with the nanocomposites achieving better performance than bare AuNRs and bare PDA nanoparticles. The degradation of 54% of Rh6G initial concentration is achieved within 60 min of irradiation with a catalyst concentration of 7.4 µg mL?1. Photodegradation kinetics, time-resolved spectroscopy, and finite-element-method simulations of plasmons show that AuNRs plasmons, coupled with the low thermal conductivity of PDA, provide slow thermalization, while enhancing the charge carrier transfer. |