Monitoring of the Surface Modification of Nanoparticlesby Electrochemical Measurements Using Scanning Electrochemical Microscope

Hynek, David; Žůrek, Michal; Babula, Petr; Adam, Vojtěch; ReneKizek,

doi:10.5772/57203

Cited by 2 publications

(1 citation statement)

References 108 publications

(160 reference statements)

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“…Voltammetric measurements have been previously used for the quantification and stability studies of quantum dots [15,16]. For instance, Hynek et al [17] have measured the electrochemical changes of aqueous solutions of QDs such as PbS, CdS, CdTe and CuS modified with different capping agents using several aging and storage conditions. They have been also used as detectors in biosensing applications based on the use of QDs as voltammetric [18,19] or electrochemiluminescence [20] labels.…”

Section: Introductionmentioning

confidence: 99%

Voltammetric determination of size and particle concentration of Cd-based quantum dots

Martín‐Yerga

Bouzas-Ramos

Menéndez-Miranda

et al. 2015

Electrochimica Acta

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A B S T R A C TIn this article, we present two novel methodologies, using a simple electrochemical approach, for the determination of the size and particle concentration of Cd-based Quantum Dots (QDs), nanoparticles widely used as photoluminescent labels in many bioanalytical applications. Such QDs were analyzed directly in organic medium and in water after derivatization with an amphiphilic polymer. Screenprinted carbon electrodes modified with a bismuth film were employed as the electrochemical platform. The herein proposed methodologies allow the reliable determination of very low nanoparticle concentrations. Detection limits achieved with the selected experimental conditions were of 3.0 Â 10 12 nanoparticles mL À1 for CdSe QDs dispersed in organic medium and of 6.0 Â 10 12 nanoparticles mL À1 for water-solubilized CdSe/ZnS QDs (both with a core size of 3.26 nm). However, detection limits could be improved increasing the QDs sample volume or the voltammetric deposition time. Furthermore, the proposed methodologies allowed the determination of the CdSe QDs diameters. Results obtained were validated after comparison with standard spectroscopic approaches. The electrochemical characterization of QDs, disclosed in this work, allows to perform a synthesis control with a simple, inexpensive and fast approach.

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Section: Introductionmentioning

confidence: 99%

Voltammetric determination of size and particle concentration of Cd-based quantum dots

Martín‐Yerga

Bouzas-Ramos

Menéndez-Miranda

et al. 2015

Electrochimica Acta

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On the Use of the Scanning Electrochemical Microscopy in Corrosion Research

Łosiewicz

Popczyk

Smołka

et al. 2015

SSP

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This paper deals with the basic theory and the usability of Scanning Electrochemical Microscopy (SECM) in corrosion research. The SECM is thein situmethod of surface characterization which is based on the scanning of the tested surface using ultramicroelectrode and simultaneous electrochemical testing of the surface. This technique provides an electrochemical imaging of the surface. Key applications of SECM have been demonstrated based on the newest literature data covering the past two years of the active research in the field of corrosion in a nanoscale.

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Monitoring of the Surface Modification of Nanoparticlesby Electrochemical Measurements Using Scanning Electrochemical Microscope

Cited by 2 publications

References 108 publications

Voltammetric determination of size and particle concentration of Cd-based quantum dots

Voltammetric determination of size and particle concentration of Cd-based quantum dots

On the Use of the Scanning Electrochemical Microscopy in Corrosion Research

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