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Influence of Charged Self-Assembled Monolayers on Single Nanoparticle Collision
Linoy Dery1,2, Shahar Dery1,2, Elad Gross1,2
1Institute of Chemistry, The Hebrew University, Jerusalem 91904, Israel.
Analytical Chemistry
|January 26, 2023
Summary
Investigating nanoparticle-electrode interactions reveals how electrostatic forces influence collision frequency and sizing. Attractive forces enhance collisions and sizing, while repulsive forces hinder them, impacting dynamic surface processes.
Area of Science:
- Electrochemistry
- Surface Science
- Nanotechnology
Background:
- Understanding nanoparticle (NP)-electrode interactions is crucial for dynamic surface processes like motion, adsorption, oxidation, and catalysis.
- Single nanoparticle collision events provide insights into these complex interactions at electrode surfaces.
Purpose of the Study:
- To investigate NP-electrode electrostatic interactions by tracking silver NP (AgNP) oxidation at gold microelectrodes.
- To probe the influence of attractive and repulsive electrostatic forces on collision frequency, electron transfer, and NP sizing.
Main Methods:
- Utilizing nanoimpact electrochemistry with gold microelectrodes functionalized with charged self-assembled monolayers (SAMs).
- Tuning the charge of alkanethiol-based SAMs and selecting AgNPs for controlled oxidation upon impact.
Main Results:
- Repulsive electrostatic interactions significantly decrease collision frequency and lead to inaccurate NP sizing.
- Attractive electrostatic interactions markedly increase collision frequency and expand the capability for sizing larger NPs.
Conclusions:
- NP-monolayer electrostatic interactions critically affect collision frequency and sizing accuracy in nanoimpact electrochemistry.
- These interactions can be effectively studied and manipulated using functionalized SAMs and nanoimpact techniques.
