One-Step Synthesis of Polypyrrole-Coated Gold Nanoparticles for Use as a Photothermally Active Nano-System
Autor: | Maha Fadel, Abdullah I. El-Kholy, Doaa A. Abdel Fadeel, Moustafa M. A. Ibrahim, Rania M. Hathout |
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Rok vydání: | 2020 |
Předmět: |
Materials science
Biophysics Pharmaceutical Science Nanoparticle Bioengineering 02 engineering and technology 010402 general chemistry Polypyrrole 01 natural sciences Biomaterials chemistry.chemical_compound Drug Discovery Organic Chemistry technology industry and agriculture General Medicine Photothermal therapy 021001 nanoscience & nanotechnology 0104 chemical sciences Monomer chemistry Chemical engineering Transmission electron microscopy Colloidal gold Chloroauric acid Nanorod 0210 nano-technology |
Zdroj: | International Journal of Nanomedicine. 15:2605-2615 |
ISSN: | 1178-2013 |
Popis: | Objective This paper introduces a simple one-step and ultra-fast method for synthesis of highly photothermally active polypyrrole-coated gold nanoparticles. The synthesis process is so simple that the reaction is very fast without the need for any additives or complicated steps. Methodology Polypyrrole-coated gold nanoparticles (AuPpy NPs) were synthesized by reacting chloroauric acid (HAuCl4) with pyrrole (monomer) in aqueous medium at room temperature. These nanoparticles were characterized by UV-visible-NIR spectrometry, transmission electron microscopy (TEM), AC conductivity, zeta sizer and were evaluated for dark cytotoxicity and photocytotoxicity using human hepatocellular carcinoma (HepG2) cell line as a model for cancer cells. Results The synthesized AuPpy NPs showed a peak characteristic for gold nanoparticles (530-600 nm, molar ratio dependent) and a wide absorption band along the visible-NIR region with intensity about triple or even quadruple that of polypyrrole synthesized by the conventional FeCl3 method at the same concentration and under the same conditions. TEM imaging showed that the synthesized AuPpy NPs were composed of spherical or semi-spherical gold core(s) of about 4-10 nm coated with distinct layer(s) of polypyrrole seen either loosely or in clusters. Mean sizes of the synthesized nanoparticles range between ~25 and 220 nm (molar ratio dependent). Zeta potentials of the AuPpy NPs preparations indicate their good colloidal stability. AC conductivity values of AuPpy NPs highly surpass that of Ppy prepared by the conventional FeCl3 method. AuPpy NPs were non-toxic even at high concentrations (up to 1000 µM pyrrole monomer equivalent) under dark conditions. Unlikely, light activated the photothermal activity of AuPpy NPs in a dose-dependent manner. Conclusion This method simply and successfully synthesized AuPpy NPs nanoparticles that represent a safe alternative photothermally active multifunctional tool instead of highly toxic and non-biodegradable gold nanorods. |
Databáze: | OpenAIRE |
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