Electrochemical, spectroscopic and electrogravimetric detection of oligomers occluded in electrochemically synthesized poly(3,4-ethylenedioxythiophene) films

Ventosa, Edgar; Colina, Álvaro; Heras, Aránzazu; Martínez, Alberto del Monte; Orcajo, Oscar; Ruiz, Virginia; López-Palacios, Jesús

doi:10.1016/j.electacta.2007.12.064

Cited by 17 publications

(13 citation statements)

References 55 publications

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“…Recently, the substrate-generation/tip-collection mode of SECM was exploited to confirm the release of oligomers by PEDOT films electrogenerated from aqueous solutions [170]. Such a study was made possible by the fact that the released oligomers were neutral and electrochemically active.…”

Section: Scanning Electrochemical Microscopy (Secm) Investigations Ofmentioning

confidence: 99%

Nanoscale Inhomogeneity of Conducting‐Polymer‐Based Materials

Pailleret

Semenikhin

2010

Nanostructured Conductive Polymers

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Section: Scanning Electrochemical Microscopy (Secm) Investigations Ofmentioning

confidence: 99%

Nanoscale Inhomogeneity of Conducting‐Polymer‐Based Materials

Pailleret

Semenikhin

2010

Nanostructured Conductive Polymers

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“…33,34 UV-vis absorption spectroscopy is perhaps the most used technique in spectroelectrochemistry and has been used for studying different types of chemical processes. [35][36][37] Developments in Raman spectroelectrochemistry have highlighted this technique as one of the best to characterize and study different materials and processes in many fields. [38][39][40][41][42] In the present work, most of the experiments were performed using UV-vis absorption spectroelectrochemistry, although Raman spectroelectrochemistry provided suitable information in the study of particular systems, as for example, carbon nanotubes.…”

mentioning

confidence: 99%

Bipolar Spectroelectrochemistry

2017

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Bipolar electrochemistry is receiving growing attention in the last years, not only because it is an important tool for studying electron transfer processes, but also because it is really fruitful in the development of new analytical sensors. Bipolar electrodes show promising applications as a direct analytical tool since oxidation and reduction reactions take place simultaneously on different parts of a single conductor. There are several electrochemical devices that provide information about electron transfer between two immiscible electrolyte solutions, but to the best of our knowledge, this is the first time that a bipolar device is able to record two spectroelectrochemical responses concomitantly at two different compartments. It allows deconvolving the electrochemical signal into two different optical signals related to the electron transfer processes occurring at two compartments that are electrically in contact. The combination of an electrochemical and two spectroscopic responses is indeed very useful, providing essential advantages in the study of a huge variety of systems. The study of three different electrochemical systems, such as reversible redox couples, carbon nanotubes, and conducting polymers has allowed us to validate the new cell and to demonstrate the capabilities of this technique to obtain valuable time-resolved information related to the electron transfer processes.

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“…[17][18][19][20][21] Here electrochemistry is combined with UV/Vis absorption spectroscopy to follow the formation of Au NPs. UV/Vis spectroelectrochemistry provides mechanistic information on Au NPs synthesis because the electrochemical process can be easily followed by observing gold characteristic plasmon band.…”

Section: Introductionmentioning

confidence: 99%

Spectroelectrochemical synthesis of gold nanoparticles using cyclic voltammetry in the presence of a protective agent

et al. 2014

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Modification of electrodes with metal nanoparticles (NPs) is attracting intense interest because the widespread applications of these electrodes as sensors in electroanalysis. In the present study, we have analysed the electrodeposition of gold nanoparticles (Au NPs) on a platinum electrode in presence of polyvinylpyrrolidone using UV/Vis spectroelectrochemistry, which allows us to obtain in-situ evidences on the kind of nanoparticles deposited on the electrode. Under the selected experimental conditions, it has been possible to understand the reaction pathway for the synthesis of Au NPs in a voltammetry experiment. We establish that generation of NPs of a specific size is dramatically favoured during the different oxidation and reduction processes. Experiments with and without protective agent revealed that NPs generation is favoured since the first cycle when a protective agent is present in solution. IntroductionSynthesis of noble-metal nanoparticles (NPs) has received significant attention in recent years. [1][2][3][4] The ability to generate NPs with controlled size and shape is very important to advance in many areas of science and technology. In fact, scientists are beginning to understand the complex physics that leads to the generation of NPs with controlled size and shape. [5][6][7] In general, the chemical synthesis route is more developed than the electrochemical one, as it allows better control of the final type of NPs. 5,8,9 However, a number of studies have shown that it is also possible to control Au NPs morphology using electrochemistry, 10-16 although a lot of them use a gold sacrificial anode like source of gold ions.13-15 Electrochemical synthesis offers important advantages such as the production of NPs with high purity. 3 With chemical synthesis is possible to obtain well-defined NPs controlling the ratio between the reductive agent, gold precursor and protective agent. 5,8,9 On the other hand, electrochemical synthesis is very interesting to understand the mechanism of NPs generation because it is possible to control easily the potential at which the reaction takes place.In the case of the electrochemical synthesis, the reaction mechanism can be better understood when in-situ characterization techniques are coupled to electrochemistry to provide more information about the process that is taking place. [17][18][19][20][21] Here electrochemistry is combined with UV/Vis absorption spectroscopy to follow the formation of Au NPs. UV/Vis spectroelectrochemistry provides mechanistic information on Au NPs synthesis because the electrochemical process can be easily followed by observing gold characteristic plasmon band. 2,22 Recently, we have demonstrated that a multipulse technique yields monodisperse spherical Au NPs. 19This method was based on the application of several consecutive oxidation/reduction steps. In order to understand better the electrochemical process, here we have developed a new synthesis route based on cyclic voltammetry, where reduction and oxidation potentials are alternated d...

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Electrochemical, spectroscopic and electrogravimetric detection of oligomers occluded in electrochemically synthesized poly(3,4-ethylenedioxythiophene) films

Cited by 17 publications

References 55 publications

Nanoscale Inhomogeneity of Conducting‐Polymer‐Based Materials

Nanoscale Inhomogeneity of Conducting‐Polymer‐Based Materials

Bipolar Spectroelectrochemistry

Spectroelectrochemical synthesis of gold nanoparticles using cyclic voltammetry in the presence of a protective agent

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