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Electrochemical Nanoparticle Sizing Via Nano-Impacts: How Large a Nanoparticle Can be Measured?

Bartlett TR, Sokolov SV, Compton RG - ChemistryOpen (2015)

Bottom Line: The 'nano-impacts' technique is an excellent and qualitative in situ method for nanoparticle characterization.Two complementary studies on silver and silver bromide nanoparticles (NPs) were used to assess the large radius limit of the nano-impact method for NP sizing.Noting that by definition a NP cannot be larger than 100 nm in diameter, we have shown that the method quantitatively sizes at the largest limit, the lower limit having been previously reported as ∼6 nm.1.

View Article: PubMed Central - PubMed

Affiliation: Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford South Parks Road, Oxford, OX1 3QZ, UK.

ABSTRACT
The field of nanoparticle (NP) sizing encompasses a wide array of techniques, with electron microscopy and dynamic light scattering (DLS) having become the established methods for NP quantification; however, these techniques are not always applicable. A new and rapidly developing method that addresses the limitations of these techniques is the electrochemical detection of NPs in solution. The 'nano-impacts' technique is an excellent and qualitative in situ method for nanoparticle characterization. Two complementary studies on silver and silver bromide nanoparticles (NPs) were used to assess the large radius limit of the nano-impact method for NP sizing. Noting that by definition a NP cannot be larger than 100 nm in diameter, we have shown that the method quantitatively sizes at the largest limit, the lower limit having been previously reported as ∼6 nm.1.

No MeSH data available.


Cyclic voltammetry of Ag NPs suspended in 20 mm KCl at 100 mVs−1 on RAM electrode.
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fig07: Cyclic voltammetry of Ag NPs suspended in 20 mm KCl at 100 mVs−1 on RAM electrode.

Mentions: First the electrochemical behaviour of silver NPs was determined through cyclic voltammetry of the experimental solution (1.4 mL of stock Ag NPs in 8.6 mL of 20 mm potassium chloride) on the RAM electrode in order to determine the oxidation potential of the NPs in the lower concentration of electrolyte scanning, first oxidatively then reductively. Figure 7 shows a cyclic voltammogram in the presence (black) and absence (red) of the NPs. No distinctive features are observed in the absence of NPs (red line). A clear oxidative peak is observed at +0.145 V vs. a saturated calomel electrode (SCE) in the presence of the NPs, which is in good agreement with previous reports,19 and no further peaks were observed in the CV. The oxidation peak corresponds to formation of Ag+ species by a one-electron oxidation:5


Electrochemical Nanoparticle Sizing Via Nano-Impacts: How Large a Nanoparticle Can be Measured?

Bartlett TR, Sokolov SV, Compton RG - ChemistryOpen (2015)

Cyclic voltammetry of Ag NPs suspended in 20 mm KCl at 100 mVs−1 on RAM electrode.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4608527&req=5

fig07: Cyclic voltammetry of Ag NPs suspended in 20 mm KCl at 100 mVs−1 on RAM electrode.
Mentions: First the electrochemical behaviour of silver NPs was determined through cyclic voltammetry of the experimental solution (1.4 mL of stock Ag NPs in 8.6 mL of 20 mm potassium chloride) on the RAM electrode in order to determine the oxidation potential of the NPs in the lower concentration of electrolyte scanning, first oxidatively then reductively. Figure 7 shows a cyclic voltammogram in the presence (black) and absence (red) of the NPs. No distinctive features are observed in the absence of NPs (red line). A clear oxidative peak is observed at +0.145 V vs. a saturated calomel electrode (SCE) in the presence of the NPs, which is in good agreement with previous reports,19 and no further peaks were observed in the CV. The oxidation peak corresponds to formation of Ag+ species by a one-electron oxidation:5

Bottom Line: The 'nano-impacts' technique is an excellent and qualitative in situ method for nanoparticle characterization.Two complementary studies on silver and silver bromide nanoparticles (NPs) were used to assess the large radius limit of the nano-impact method for NP sizing.Noting that by definition a NP cannot be larger than 100 nm in diameter, we have shown that the method quantitatively sizes at the largest limit, the lower limit having been previously reported as ∼6 nm.1.

View Article: PubMed Central - PubMed

Affiliation: Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford South Parks Road, Oxford, OX1 3QZ, UK.

ABSTRACT
The field of nanoparticle (NP) sizing encompasses a wide array of techniques, with electron microscopy and dynamic light scattering (DLS) having become the established methods for NP quantification; however, these techniques are not always applicable. A new and rapidly developing method that addresses the limitations of these techniques is the electrochemical detection of NPs in solution. The 'nano-impacts' technique is an excellent and qualitative in situ method for nanoparticle characterization. Two complementary studies on silver and silver bromide nanoparticles (NPs) were used to assess the large radius limit of the nano-impact method for NP sizing. Noting that by definition a NP cannot be larger than 100 nm in diameter, we have shown that the method quantitatively sizes at the largest limit, the lower limit having been previously reported as ∼6 nm.1.

No MeSH data available.