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Anodic stripping voltammetry of silver nanoparticles: aggregation leads to incomplete stripping.

Cloake SJ, Toh HS, Lee PT, Salter C, Johnston C, Compton RG - ChemistryOpen (2014)

Bottom Line: Through the anodic stripping of the silver nanoparticles that were aggregated to different extents, it was found that the peak area of the oxidative signal corresponding to the stripping of silver to silver(I) ions decreases with increasing aggregation.Aggregation causes incomplete stripping of the silver nanoparticles.Hence, drop casting, which is known to lead to aggregation, is not encouraged for preparing electrodes for analytical purposes.

View Article: PubMed Central - PubMed

Affiliation: Physical & Theoretical Chemistry Laboratory, Oxford University South Parks Road, Oxford OX1 3QZ (UK).

ABSTRACT
The influence of nanoparticle aggregation on anodic stripping voltammetry is reported. Dopamine-capped silver nanoparticles were chosen as a model system, and melamine was used to induce aggregation in the nanoparticles. Through the anodic stripping of the silver nanoparticles that were aggregated to different extents, it was found that the peak area of the oxidative signal corresponding to the stripping of silver to silver(I) ions decreases with increasing aggregation. Aggregation causes incomplete stripping of the silver nanoparticles. Two possible mechanisms of 'partial oxidation' and 'inactivation' of the nanoparticles are proposed to account for this finding. Aggregation effects must be considered when anodic stripping voltammetry is used for nanoparticle detection and quantification. Hence, drop casting, which is known to lead to aggregation, is not encouraged for preparing electrodes for analytical purposes.

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a) Possible Michael addition reaction between oxidised dopamine and melamine. b) Possible Schiff base reaction between oxidised dopamine and melamine.
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sch2: a) Possible Michael addition reaction between oxidised dopamine and melamine. b) Possible Schiff base reaction between oxidised dopamine and melamine.

Mentions: To induce aggregation, melamine can be added during the synthesis of dopamine-capped silver nanoparticles.[10] In alkaline conditions, reports have suggested that the melamine might covalently bond to dopamine stabilised silver nanoparticles, via two possible reaction routes summarised in Scheme 2 a,b.[8], [10]


Anodic stripping voltammetry of silver nanoparticles: aggregation leads to incomplete stripping.

Cloake SJ, Toh HS, Lee PT, Salter C, Johnston C, Compton RG - ChemistryOpen (2014)

a) Possible Michael addition reaction between oxidised dopamine and melamine. b) Possible Schiff base reaction between oxidised dopamine and melamine.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4380949&req=5

sch2: a) Possible Michael addition reaction between oxidised dopamine and melamine. b) Possible Schiff base reaction between oxidised dopamine and melamine.
Mentions: To induce aggregation, melamine can be added during the synthesis of dopamine-capped silver nanoparticles.[10] In alkaline conditions, reports have suggested that the melamine might covalently bond to dopamine stabilised silver nanoparticles, via two possible reaction routes summarised in Scheme 2 a,b.[8], [10]

Bottom Line: Through the anodic stripping of the silver nanoparticles that were aggregated to different extents, it was found that the peak area of the oxidative signal corresponding to the stripping of silver to silver(I) ions decreases with increasing aggregation.Aggregation causes incomplete stripping of the silver nanoparticles.Hence, drop casting, which is known to lead to aggregation, is not encouraged for preparing electrodes for analytical purposes.

View Article: PubMed Central - PubMed

Affiliation: Physical & Theoretical Chemistry Laboratory, Oxford University South Parks Road, Oxford OX1 3QZ (UK).

ABSTRACT
The influence of nanoparticle aggregation on anodic stripping voltammetry is reported. Dopamine-capped silver nanoparticles were chosen as a model system, and melamine was used to induce aggregation in the nanoparticles. Through the anodic stripping of the silver nanoparticles that were aggregated to different extents, it was found that the peak area of the oxidative signal corresponding to the stripping of silver to silver(I) ions decreases with increasing aggregation. Aggregation causes incomplete stripping of the silver nanoparticles. Two possible mechanisms of 'partial oxidation' and 'inactivation' of the nanoparticles are proposed to account for this finding. Aggregation effects must be considered when anodic stripping voltammetry is used for nanoparticle detection and quantification. Hence, drop casting, which is known to lead to aggregation, is not encouraged for preparing electrodes for analytical purposes.

No MeSH data available.


Related in: MedlinePlus