Template synthesis of plasmonic nanoparticles in solution and in 2D ensembles
Olga V. Dement’eva;
Frumkin Institute of Physical Chemistry and Electrochemistry of Russian Academy of Sciences, Leninsky prospect 31-4, Moscow, 119071 Russia
Abstract
Surfactant micelles are among the most interesting objects of colloidal chemistry, widely used to solve various scientific and practical problems related to the localization and catalysis of chemical reactions, the creation of new materials, encapsulation and delivery of drugs, etc.
This report discusses the ability of surfactant micelles to act as soft templates that allow controlling not only the morphology of nanoparticles (NPs) of different nature during their synthesis in the liquid phase, but also the geometry of NP ensembles formed on solid substrates. The main focus of the report is on gold NPs and bimetallic Au/Ag particles.
First, we examine the influence of the length of surfactant hydrocarbon tail and the presence of hydrophobic polyphenols curcumin and quercetin in the reaction system on the character of seedless growth of gold nanorods in micellar solutions of alkyltrimethylammonium bromides. It is shown, in particular, that the use of curcumin and quercetin as reducing agents allows for a significant reduction in the surfactant content in the system.
Second part of report devoted to the formation of hexagonally ordered 2D ensembles of plasmonic NPs by diblock copolymer lithography using a micelle-forming copolymer of styrene and vinylpyridine as a templating agent. Quantitative data on the influence of the copolymer molecular weight and the blocks ratio, as well as the conditions for the formation of its monomicellar film on the structure of the NP ensemble are presented. Moreover, some features and challenges of shape-controlled enlargement of NPs in such 2D ensembles are analyzed.
Speaker
Olga V. Dement'eva
Frumkin Institute of Physical Chemistry and Electrochemistry of Russian Academy of Sciences
Russia
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