from the conferences organized by TANGER Ltd.
The extensive studies in nanoscience in the last decades are dedicated to the development of new protocols for the preparation of nanoparticles (NPs) with controlled size and shape. The dimensions and steric parameters influence the reactivity, catalytic, electrical, and optical properties and define the application of NPs in various fields: catalysis, sensing, medicine, electronics, etc. The combination of the green synthesis approach in the preparation of noble metal NPs, which defines their biocompatibility, environmental, cost, and time efficiency in synthesis, together with the control of optical properties such as near-infrared (NIR) response through the regulation and control of both size and shape, opens new possibilities in nanomedicine to develop new effective drug delivery systems, to improve the selectivity and efficiency of optical photothermal therapy, etc. Protocols for the synthesis of gold NPs using phytochemical plant extracts are one of the most promising ways in the design of biocompatible gold NPs with different shapes.In this study, we review the recent achievements in the synthesis of gold nanoparticles with different morphologies such as nanotriangles, nanohexagons, nanourchins, and nanoshells using natural polyphenols. We consider previously isolated compounds, such as gallic acid, and rosmarinic acid, as well as whole plant extracts of peppermint, goldenrod, juniper, lemon balm, etc. The results of NIR spectroscopy and transmission electron microscopy studies are discussed. We show the possibility of synthesizing gold NPs with a size below 60 nm with a response in the NIR region by influencing the shape of gold NPs.
Keywords: Plasmonic nanoparticles, green synthesis, phytosynthesis, biocompatible, near infrared range© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.