A Compact and Versatile Instrument for Radio Frequency Heating in Nonisothermal Electrochemical Studies

Wachholz, Falko; Gimsa, Jan; Duwensee, Heiko; Grabow, Harald; Gründler, Peter; Flechsig, Gerd‐Uwe

doi:10.1002/elan.200603757

Cited by 28 publications

(20 citation statements)

References 37 publications

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“…Fundamental and basic studies of heated electrodes have been reviewed recently [42]. Our new heating device allows direct or indirect heating of a broad variety of electrode designs [43].…”

Section: Introductionmentioning

confidence: 99%

Comparison of DNA Hybridization at Rotating and Heated Gold Disk Electrodes

2007

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This paper reports about the influence of temperature, hybridization time and convection upon the detection of osmium tetroxide bipyridine-labeled target oligonucleotides at rotating gold disk (RDE) and heated low temperature co-fired ceramics (LTCC) gold disk electrodes. We used mixed self-assembled monolayers of hexathiol-linked probe oligonucleotides and mercaptohexanol on the gold surface of the electrodes for the hybridization detection of the labeled targets by means of square-wave voltammetry. Due to protective strands, the osmium tetroxide-modified target strands were still able to hybridize with the immobilized probe strands. The hybridization of such osmium tetroxide bipyridine-modified target strands with thiol-linked probe strands immobilized on gold yielded large reversible square-wave-voltammetric signals. Rotation speed and, hence, mass transport due to convection has only marginal effects. On the other hand, temperature affects greatly the hybridization step as indicated by both heated LTCC electrode in cold and RDE in warm hybridization solution. Calculated detection limits of 3.6 and 3.1 nM targets at the RDE and the LTCC electrode, respectively, have been almost the same at both types of electrodes. Applying an appropriate temperature during hybridization is more important than mechanically enhanced mass transport.

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“…Fundamental and basic studies of heated electrodes have been reviewed recently [42]. Our new heating device allows direct or indirect heating of a broad variety of electrode designs [43].…”

Section: Introductionmentioning

confidence: 99%

Comparison of DNA Hybridization at Rotating and Heated Gold Disk Electrodes

2007

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“…In the present case, the most important hardware add-on was a unit allowing to heat electrodes insitu by means of a strong radio frequency current [5,6]. The heat generator unit is connected to the electrode wire according to the arrangement given in [6].…”

Section: Additional Circuitsmentioning

confidence: 99%

System of Modular Design for Electroanalysis Extended to Thermoelectrochemical Studies

Gründler

2009

Electroanalysis

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An instrument for electroanalysis extended to thermoelectrochemical studies is presented here consisting of easily available components. An analog potentiostat is combined with a microcontroller. The latter is controlled by an Excel sheet extended by macros written in VBA (visual basic for applications). The worksheet acts as a virtual instrument with front panel and command buttons. Thus, specialized, expansive measuring software packages are unnecessary. The design of new techniques is facilitated by a of graphical representation of pulse sequences or the exciting waveforms. The instrument has proved to be useful for design and performance of non conventional electrochemical techniques working with additional parameters like irradiation or heat. Examples are given for thermoelectrochemical measuring sequences like TPV (temperature pulse voltammetry).

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“…Two years ago, we introduced a compact heating instrument comprising a filtering bridge for direct electric heating even of carbon electrodes while performing undisturbed electrochemical measurements [44]. Lin et al studied electrochemiluminescence at directly heated Pt wire electrodes [45,46].…”

Section: Introductionmentioning

confidence: 99%

Directly Heated Bismuth Film Electrodes Based on Gold Microwires

et al. 2010

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As a nontoxic substitute for mercury electrodes, bismuth electrodes attained a lot of attention during the last years. In this report we describe for the first time the preparation of two different directly heatable bismuth-modified microwire electrodes. We characterized the electrochemical behaviour using cyclic voltammetry in acetate buffer and alkaline tartrate solution. The bismuth electrodes show a significantly wider potential window compared with bare gold wires. In the presence of picric acid as one example for the detection of explosives, the bismuth electrodes deliver higher signals. By applying heat during the measurements, the signals can be enhanced further. We used the temperature pulse amperometry (TPA) technique to improve the electrochemical response at the different types of electrodes. In this preliminary study, we were able to detect 3 ppm traces of picric acid.

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A Compact and Versatile Instrument for Radio Frequency Heating in Nonisothermal Electrochemical Studies

Cited by 28 publications

References 37 publications

Comparison of DNA Hybridization at Rotating and Heated Gold Disk Electrodes

Comparison of DNA Hybridization at Rotating and Heated Gold Disk Electrodes

System of Modular Design for Electroanalysis Extended to Thermoelectrochemical Studies

Directly Heated Bismuth Film Electrodes Based on Gold Microwires

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