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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.


Chronoamperometry at −1.00 V vs. MSE. Red: 0.10 m NaNO3. Black: 0.10 m NaNO3 and AgBr NPs (total [AgBr]=18.8 μgml−1). Lines offset by 0.5 nA for clarity.
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fig04: Chronoamperometry at −1.00 V vs. MSE. Red: 0.10 m NaNO3. Black: 0.10 m NaNO3 and AgBr NPs (total [AgBr]=18.8 μgml−1). Lines offset by 0.5 nA for clarity.

Mentions: As no clearly defined reduction peak was observed in the stripping voltammetry, initial impact experiments were conducted at a potential far more negative than the onset of the observed reductive features. Figure 4 shows the current-time transient in the absence and presence of AgBr NPs at −1.00 V vs MSE, whereby reductive features are observed only in the presence of the NPs. These spikes are indicative of direct electrolytic impacts and suggest the first successful detection of stochastic silver halide impacts.


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

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

Chronoamperometry at −1.00 V vs. MSE. Red: 0.10 m NaNO3. Black: 0.10 m NaNO3 and AgBr NPs (total [AgBr]=18.8 μgml−1). Lines offset by 0.5 nA for clarity.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

fig04: Chronoamperometry at −1.00 V vs. MSE. Red: 0.10 m NaNO3. Black: 0.10 m NaNO3 and AgBr NPs (total [AgBr]=18.8 μgml−1). Lines offset by 0.5 nA for clarity.
Mentions: As no clearly defined reduction peak was observed in the stripping voltammetry, initial impact experiments were conducted at a potential far more negative than the onset of the observed reductive features. Figure 4 shows the current-time transient in the absence and presence of AgBr NPs at −1.00 V vs MSE, whereby reductive features are observed only in the presence of the NPs. These spikes are indicative of direct electrolytic impacts and suggest the first successful detection of stochastic silver halide impacts.

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.