Electrochemistry
Single silver nanoparticles strip in many shots
Open access · cc by · source: Europe PMC
SECCM impact transients show 10 nm Ag particles often dissolve in one spike, but larger ones leave, return, and only partly oxidize.
How this study connects
Role on claims
Each row is a claim on a concept or method page where this paper supports, challenges, or qualifies the statement. Roles are hand-checked — not a model guess.
This library holds 3 empirical chemistry papers on seccm with isolated findings, rates or spectra rather than reviews.
Evidence for the claim as stated.
SECCM impact transients show 10 nm Ag particles often dissolve in one spike, but larger ones leave, return, and only partly oxidize.
Evidence for the claim as stated.
Study at a glance
- Design
- Animal / in-vitro — Scanning electrochemical cell microscopy of single Ag nanoparticle impact transients
- N
- 10–100 nm particles on glassy-carbon and gold collectors; many single-particle events
- Population
- Single silver nanoparticles at electrode surfaces
- Outcome
- 10 nm particles often dissolve in one spike, while larger particles hop and only partly oxidize, so impact coulometry is a poor general sizing method
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Inspect source passages
Single silver nanoparticles strip in many shots
These passages occur verbatim in the stored paper text. They support the points listed below; they do not verify every statement in the explanation.
Most 10 nm Ag NPs dissolve in single events lasting a few milliseconds.
Whereas most of the NPs of diameter, d = 10 nm dissolve electrochemically in single events (on the timescale of the measurement technique) that lasts a few milliseconds, this is not true of NPs with larger diameters.
For larger NPs, 60% to 85% of consumed charge occurs in event bundles or saw-tooth profiles.
In this case, between 60% and 85% of the total consumed charge occurs in event bundles or saw-tooth current profiles that may span from tens of milliseconds up to several seconds for a single NP.
Key findings
10 nm particles mostly dissolve in a few-millisecond single event. For larger particles, 60–85% of charge sits in bundled or saw-tooth transients spanning milliseconds to seconds because particles hop in and out of the tunneling region. 60–100 nm particles often leave after incomplete stripping, so impact coulometry is a poor general sizing method.
Methodology
Authors landed single Ag nanoparticles of 10–100 nm on glassy-carbon and gold collectors in a scanning electrochemical cell microscope and classified current–time shapes, charges, durations, and impact frequencies.
Limitations
The study is Ag on GC/Au in one electrolyte window; it does not size-calibrate every nanomaterial claimed in the impact-coulometry literature.
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