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Microwave‐Assisted Synthesis of Core–Shell Nanoparticles—Insights into the Growth of Different Geometries
Author(s) -
Womiloju Aisha A.,
Höppener Christiane,
Schubert Ulrich S.,
Hoeppener Stephanie
Publication year - 2020
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/ppsc.202000019
Subject(s) - bimetallic strip , nanoparticle , materials science , core (optical fiber) , shell (structure) , plasmon , bilayer , nanotechnology , ascorbic acid , surface plasmon resonance , chemical engineering , chemistry , composite material , optoelectronics , membrane , metallurgy , metal , biochemistry , food science , engineering
Microwave irradiation is utilized for the rapid synthesis of gold–silver core–shell bimetallic nanoparticles (NPs) in a two‐step process. A strategy of establishing a bilayer organic barrier around the core using citrate and ascorbic acid as capping agents, providing a means to achieve a well‐defined boundary layer between the core and the shell material, is reported. These boundary layers are essential for synthesizing different core–shell morphologies and the approach results in tunable bimetallic NPs with defined core–shell structures, both for spherical as well as for triangular seed cores. In addition, theoretical calculations of the plasmonic characteristics based on the boundary element method of different classes of NPs are conducted. These investigations enable conclusions to be drawn on the influence of the core morphology on the tunability of their localized surface plasmon resonances.