Use of anodic stripping voltammetry to study the size-selective electrophoretic deposition and aggregation-dependent oxidation of metal nanoparticles.

Allen, Stacy L.

doi:10.18297/etd/3141

Cited by 1 publication

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“…The negative values of Gibbs free energy reveal the spontaneity of the redox process (Table ). Brainina and co-workers assumed that the change in Gibbs free energy of the NPs is associated with a decreasing size (Plieth’s theory), which leads to a negative shift in E p . − Our experimental Δ G does not follow the theoretical trend. The reasons behind this discrepancy are not clear at this moment.…”

Section: Results and Discussionmentioning

confidence: 60%

Electrochemistry as a Complementary Technique for Revealing the Influence of Reducing Agent Concentration on AgNPs

2022

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The synthesis process of AgNPs has been attracting a lot of attention in the fields of biosensors/sensors, diagnostics, and therapeutic applications. An attempt to understand the effect of different concentrations of reducing agents on the synthetic design process has been made. In this paper, we gather information on voltammetry studies and relate it with UV–vis and scanning electron microscopy (SEM) analyses. Given the kinetics, localized surface plasmon absorption (LSPR) band, and narrow size distribution of these methods, it was possible to compare the obtained measurements and clearly distinguish sizes and aggregation. AgNPs measured by SEM showed a statistically significant reduction of the nanoparticle sizes from 65 to 37.5 nm as the reducing agent increased. Well-matched d-spacing data calculated from selected area electron diffraction (SAED) patterns and X-ray diffraction (XRD) were obtained for all of the samples. The UV–vis studies showed that the SPR bands shift toward the blue region as the reducing agent concentration is increased, indicating a decrease in particle sizes. It is worth emphasizing that cyclic voltammetry (CV) and differential pulse voltammetry (DPV) coincide well with SEM on the aggregation of AgNPs at higher concentrations. A 10 mM reducing agent concentration resulted in uniform outcomes for producing AgNPs with the smallest size in terms of full width at half-maximum (FWHM) in all of the methods used in this study, while UV–vis band gaps increase with increasing reducing agent concentration. In agreement with all of the methods investigated, the results suggested that the best concentration of the reducing agents is 10 mM for a target application. These findings suggest the usefulness of voltammetry as a complementary method that can be used as a qualitative guide to identify the size and aggregation of NPs.

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Section: Results and Discussionmentioning

confidence: 60%

Electrochemistry as a Complementary Technique for Revealing the Influence of Reducing Agent Concentration on AgNPs

2022

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show abstract

Use of anodic stripping voltammetry to study the size-selective electrophoretic deposition and aggregation-dependent oxidation of metal nanoparticles.

Abstract: valuable feedback on my projects. Lastly, I would like to thank the members of my group both past and present for their help and patience. In particular, Dr. Rafael Masitas who mentored me when I first joined the group and taught me the foundations of electrochemistry.

Cited by 1 publication

References 81 publications

Electrochemistry as a Complementary Technique for Revealing the Influence of Reducing Agent Concentration on AgNPs

Electrochemistry as a Complementary Technique for Revealing the Influence of Reducing Agent Concentration on AgNPs

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