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Updated: Jul 4, 2026
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Colloidal Synthesis of Nanopatch Antennas for Applications in Plasmonics and Nanophotonics
Published on: May 28, 2016
Single nanoparticle plasmonic devices by the "grafting to" method.
Robert Lupitskyy1, Mikhail Motornov, Sergiy Minko
1Department of Chemistry and Biomolecular Sciences, Clarkson University, Potsdam, New York 13699-5810, USA.
Langmuir : the ACS Journal of Surfaces and Colloids
|July 4, 2008
Summary
Researchers created smart nanoparticles with a silica core and a pH-responsive shell. These gold nanoparticle-decorated structures change color with pH, enabling their use as novel single-particle sensors.
Area of Science:
- Materials Science
- Nanotechnology
- Chemistry
Background:
- Hierarchically organized nanostructures offer unique properties for sensing applications.
- Controlling nanoparticle spacing is crucial for tuning optical properties.
Purpose of the Study:
- To synthesize and characterize novel hierarchically organized single-nanoparticle structures.
- To investigate the pH-responsive behavior and optical properties of these nanostructures.
- To explore their potential as single-particle sensors.
Main Methods:
- Synthesis of silica core nanoparticles.
- Coating with pH-responsive poly(2-vinylpyridine) shells.
- Decoration with gold nanoparticles.
- Characterization of structural and optical properties via pH variation.
Main Results:
- Successfully synthesized core-shell nanoparticles with tunable interparticle distances.
- Observed reversible color changes (red to purple-blue) with pH fluctuations (2.5-6).
- Demonstrated a pronounced shift in surface plasmon absorption peak correlated with interparticle distance.
Conclusions:
- The developed nanostructures exhibit reversible, pH-dependent optical responses.
- These composite nanoparticles show promise as sensitive, free-standing sensors for miniaturized analytical systems.
