Lateral deposition of polypyrrole lines over insulating gaps. Towards the development of polymer‐based electronic devices

Kranz, Christine; Ludwig, Markus; Gaub, Herrmann E.; Schuhnrann, Wolf Gang

doi:10.1002/adma.19950070613

Cited by 77 publications

(25 citation statements)

References 17 publications

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“…The presented measurements were performed in a freshly prepared 0.1 m sodium phosphate buffer (pH 7.4) with Pt microelectrodes fabricated from Pt wire (Goodfellow, Bad Nauheim, Germany) as SECM tip. [25] The electrodes were conditioned by application of the potential pulse sequence that was later used at each grid point in the measurements (see below) 100-200 times. As reference electrode, a home-made Ag/AgCl/3 m KCl electrode was used.…”

Section: Methodsmentioning

confidence: 99%

Electrochemical Synthesis of Core–Shell Catalysts for Electrocatalytic Applications

et al. 2010

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A novel electrochemical method to prepare platinum shells around carbon-supported metal nanoparticles (Ru and Au) by pulsed electrodeposition from solutions containing Pt ions is presented. Shell formation is confirmed by characteristic changes in the cyclic voltammograms, and is further evidenced by monitoring particle growth by transmission electron microscopy as well as by energy-dispersive analysis of X rays (EDX). Scanning electrochemical microscopy and EDX measurements indicate a selective Pt deposition on the metal/carbon catalyst, but not on the glassy carbon substrate. The thus prepared carbon-supported core-shell nanoparticles are investigated with regard to their activity in electrocatalytic oxygen reduction, which demonstrates the applicability of these materials in electrocatalysis or sensors.

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Section: Methodsmentioning

confidence: 99%

Electrochemical Synthesis of Core–Shell Catalysts for Electrocatalytic Applications

et al. 2010

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“…Platinum microelectrodes were fabricated from 25 mm Pt wire (Goodfellow, Germany) by a protocol described earlier. [50] A threeelectrode configuration was completed with a Pt wire as counter-electrode and an Ag/AgCl pseudo-reference electrode. The copper surface was left unbiased for the duration of the experiments; that is, the samples were at their corresponding open-circuit potential (OCP).…”

Section: Methodsmentioning

confidence: 99%

Application of AC‐SECM in Corrosion Science: Local Visualisation of Inhibitor Films on Active Metals for Corrosion Protection

Pähler

Santana

Schuhmann

2010

Chemistry A European J

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The suitability of frequency-dependent alternating-current scanning electrochemical microscopy (4D AC-SECM) for investigation of thin passivating layers covering the surface of corrosion-inhibited metals has been demonstrated. Inhibition of copper corrosion by benzotriazole (BTAH) and methylbenzotriazole (MBTAH), which are effective inhibitors for this metal under many environmental conditions, was investigated. Strong dependencies were found for the AC z-approach curves with both the duration of the inhibitor treatment and the frequency of the AC excitation signal applied in AC-SECM. Both negative and positive feedback behaviours were observed in the AC approach curves for untreated copper and for Cu/BTAH and Cu/MBTAH samples. Negative feedback behaviour occurred in the low-frequency range, whereas a positive feedback effect was observed at higher frequencies. A threshold frequency related to the passage from negative to positive regimes could be determined in each case. The threshold frequency for inhibitor-modified samples was found always to be significantly higher than for the untreated metal, because the inhibitor film provides electrical insulation for the surface. Moreover, the threshold frequency increased with increasing surface coverage by the inhibitor. 4D AC-SECM was successfully applied to visualizing spatially resolved differences in local electrochemical activity between inhibitor-free and inhibitor-covered areas of the sample.

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“…189 In this way, sufficiently high monomer concentrations for deposition are achieved periodically in the interelectrode space. Starting from a conductive substrate, the deposition can also be carried out on insulating substrates 190. Three‐dimensional polymer structures were formed by retracting the UME during electropolymerization 191.…”

Section: Secm As a Tool For Microstructuringmentioning

confidence: 99%

Scanning Electrochemical Microscopy for Direct Imaging of Reaction Rates

et al. 2007

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Not only in electrochemistry but also in biology and in membrane transport, localized processes at solid-liquid or liquid-liquid interfaces play an important role at defect sites, pores, or individual cells, but are difficult to characterize by integral investigation. Scanning electrochemical microscopy is suitable for such investigations. After two decades of development, this method is based on a solid theoretical foundation and a large number of demonstrated applications. It offers the possibility of directly imaging heterogeneous reaction rates and locally modifying substrates by electrochemically generated reagents. The applications range from classical electrochemical problems, such as the investigation of localized corrosion and electrocatalytic reactions in fuel cells, sensor surfaces, biochips, and microstructured analysis systems, to mass transport through synthetic membranes, skin and tissue, as well as intercellular communication processes. Moreover, processes can be studied that occur at liquid surfaces and liquid-liquid interfaces.

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Lateral deposition of polypyrrole lines over insulating gaps. Towards the development of polymer‐based electronic devices

Cited by 77 publications

References 17 publications

Electrochemical Synthesis of Core–Shell Catalysts for Electrocatalytic Applications

Electrochemical Synthesis of Core–Shell Catalysts for Electrocatalytic Applications

Application of AC‐SECM in Corrosion Science: Local Visualisation of Inhibitor Films on Active Metals for Corrosion Protection

Scanning Electrochemical Microscopy for Direct Imaging of Reaction Rates

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