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Updated: May 2, 2026

A Closed-Type Wireless Nanopore Electrode for Analyzing Single Nanoparticles

A Closed-Type Wireless Nanopore Electrode for Analyzing Single Nanoparticles

Published on: March 20, 2019

Magnetically controlled single-nanoparticle detection via particle-electrode collisions.

Germano P Santos¹, Antonio F A A Melo, Frank N Crespilho

¹Instituto de Química de São Carlos, Universidade de São Paulo, CEP: 780, 13560-970 São Carlos-SP, Brazil. frankcrespilho@iqsc.usp.br.

Physical Chemistry Chemical Physics : PCCP

|March 21, 2014

Summary

Magnetic fields precisely control nanoparticle collisions on gold surfaces. This study demonstrates magnetic manipulation of magnetite nanoparticles modified with Prussian blue, enabling control over their position and collision frequency on an ultramicroelectrode.

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Last Updated: May 2, 2026

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Precise Electrochemical Sizing of Individual Electro-Inactive Particles

Precise Electrochemical Sizing of Individual Electro-Inactive Particles

Published on: August 4, 2023

Area of Science:

Electrochemistry
Nanotechnology
Magnetism

Background:

Nanoparticle collisions at electrode surfaces are crucial for electrochemical sensing.
Controlling these collisions is challenging but essential for improving signal resolution.

Purpose of the Study:

To investigate the magnetic control of nanoparticle collisions on a gold ultramicroelectrode.
To demonstrate precise manipulation of nanoparticle behavior using external magnetic fields.

Main Methods:

Utilized 10 nm magnetite nanoparticles modified with Prussian blue (Fe3O4-NPs-PB).
Employed a gold ultramicroelectrode surface.
Applied a magnetic field parallel to the electrode surface to direct nanoparticle movement.

Main Results:

Observed distinct spikes in current-time transients, indicating nanoparticle collisions.
Demonstrated successful magnetic control over the number of nanoparticle collisions.
Showed magnetic field modulation of nanoparticle positions on the electrode surface.

Conclusions:

Magnetic fields offer a viable method for controlling nanoparticle collisions at electrode interfaces.
This technique allows for precise manipulation of nanoparticle-electrode interactions, enhancing electrochemical studies.