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Colloidal precipitates

Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...

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Polycrystalline Silicon Thin-film Solar cells with Plasmonic-enhanced Light-trapping

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Highly Stable Monocrystalline Silver Clusters for Plasmonic Applications.

Sergey M Novikov¹, Vladimir N Popok², Andrey B Evlyukhin^3,4

¹Centre for Nano Optics, University of Southern Denmark, Campusvej 55, DK-5230 Odense, Denmark.

Langmuir : the ACS Journal of Surfaces and Colloids

|May 26, 2017

Summary

Monocrystalline silver nanoparticles offer enhanced stability for plasmonic sensors. These nanoparticles maintain optical properties longer than conventional ones, improving sensor performance without protective coatings.

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Colloidal Synthesis of Nanopatch Antennas for Applications in Plasmonics and Nanophotonics

Colloidal Synthesis of Nanopatch Antennas for Applications in Plasmonics and Nanophotonics

Published on: May 28, 2016

Area of Science:

Materials Science
Nanotechnology
Optics

Background:

Plasmonic sensors using silver nanostructures face degradation issues in ambient conditions.
Localized surface plasmon resonances are key to silver nanostructure sensor functionality.
Degradation limits the long-term stability and applicability of silver-based plasmonic devices.

Purpose of the Study:

To fabricate and characterize stable monocrystalline silver nanoparticles (NPs).
To investigate the long-term stability of optical properties of these NPs under ambient conditions.
To compare the stability of monocrystalline silver NPs with chemically synthesized ones.

Main Methods:

Cluster-beam deposition for fabricating size-selected monocrystalline silver NP ensembles on quartz.
Characterization using linear spectroscopy, two-photon-excited photoluminescence, and microscopy (TEM, HIM, AFM).
Evaluation of plasmonic property preservation and field enhancement over time.

Main Results:

Monocrystalline silver NPs demonstrated significantly enhanced long-term stability of optical properties.
These NPs maintained plasmonic properties and field enhancements at least five times longer than chemically synthesized NPs.
No protective treatments were required to achieve this enhanced stability.

Conclusions:

Fabricated monocrystalline silver NPs offer a stable alternative for plasmonic applications.
The enhanced stability is crucial for developing robust sensors, resonators, and metamaterials.
This work paves the way for more durable and reliable plasmonic devices.