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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.


Size distribution of AgBr NPs. Black: electrochemical sizing summarised over potentials from −0.78 to −1.20 V vs. MSE. Red: sizing from SEM.
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fig06: Size distribution of AgBr NPs. Black: electrochemical sizing summarised over potentials from −0.78 to −1.20 V vs. MSE. Red: sizing from SEM.

Mentions: where Mw is the molecular weight, Q is the charge, and ρ is the NP density. Figure 6 shows the calculated electrochemical size distribution when compared to scanning electron microscopy (SEM). The sizing of the particles is in very close agreement with SEM results, with the average diameter of the NPs found to be 92 nm and 93 nm, respectively. This confirms the accurate electrochemical sizing of silver halide NPs and shows the applicability of this technique to metal compound materials approaching the limit of the nanoscale.


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

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

Size distribution of AgBr NPs. Black: electrochemical sizing summarised over potentials from −0.78 to −1.20 V vs. MSE. Red: sizing from SEM.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

fig06: Size distribution of AgBr NPs. Black: electrochemical sizing summarised over potentials from −0.78 to −1.20 V vs. MSE. Red: sizing from SEM.
Mentions: where Mw is the molecular weight, Q is the charge, and ρ is the NP density. Figure 6 shows the calculated electrochemical size distribution when compared to scanning electron microscopy (SEM). The sizing of the particles is in very close agreement with SEM results, with the average diameter of the NPs found to be 92 nm and 93 nm, respectively. This confirms the accurate electrochemical sizing of silver halide NPs and shows the applicability of this technique to metal compound materials approaching the limit of the nanoscale.

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.