Temperature pulse modulated amperometry at compact electrochemical sensors

Wachholz, Falko; Biała, Katarzyna; Piekarz, Magdalena; Flechsig, Gerd‐Uwe

doi:10.1016/j.elecom.2007.06.043

Cited by 18 publications

(11 citation statements)

References 23 publications

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“…Sensitivity is 7 times better for the AuBiFE in comparison with the bare Au wire. Signals obtained in alkaline solution containing tartrate are also better defined than those in acetate buffer according to our earlier findings [42]. We also observed that the electrodeposited bismuth film (in contrast to the AuBiFE) provides limited mechanical stability.…”

Section: Temperature Pulse Amperometric Measurementssupporting

confidence: 65%

“…The electrode temperature during application of heat pulses has been calculated based upon EMF changes between the reference and the working electrode as reported before [42]. Figure 1 displays the electrochemical characterization of three different directly heated wire electrodes in the negative potential range.…”

Section: Temperature Calibrationmentioning

confidence: 99%

“…Practical limitations, however, prevent measurements at the critical state of the used solution [40,41]. In a simplified version called "temperature pulse amperometry" (TPA), we proposed application of heat pulses to modulate amperometric signals in order to obtain peak-shaped signals, which can also compensate a shifting background [34,42,43].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Temperature Pulse Amperometric Measurementssupporting

confidence: 65%

Section: Temperature Calibrationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Directly Heated Bismuth Film Electrodes Based on Gold Microwires

et al. 2010

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“…A logic module (Model “LOGO! 230RC”, Siemens AG, Berlin, Germany) was used as a programmable relay to apply the temperature pulses, as was described earlier 16…”

Section: Methodsmentioning

confidence: 99%

Thermal Modulation of Nanomotor Movement

Balasubramanian

Kagan

Manesh

et al. 2009

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Motion control is essential for various applications of man-made nanomachines. The ability to control and regulate the movement of catalytic nanowire motors is illustrated by applying short heat pulses that allow the motors to be accelerated or slowed down. The accelerated motion observed during the heat pulses is attributed primarily to the thermal activation of the redox reactions of the H(2)O(2) fuel at the Pt and Au segments and to the decreased viscosity of the aqueous medium at elevated temperatures. The thermally modulated motion during repetitive temperature on/off cycles is highly reversible and fast, with speeds of 14 and 45 microm s(-1) at 25 and 65 degrees C, respectively. A wide range of speeds can be generated by tailoring the temperature to yield a linear speed-temperature dependence. Through the use of nickel-containing nanomotors, the ability to combine the thermally regulated motion of catalytic nanomotors with magnetic guidance is also demonstrated. Such on-demand control of the movement of nanowire motors holds great promise for complex operations of future manmade nanomachines and for creating more sophisticated nanomotors.

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“…We demonstrate that temperature pulse amperometry (TPA) [13,14] can be used to obtain highly stable peak-shaped analytically-useful glucose signals that may be advantageous in the presence of a drifting background. The high temperatures offer acceleration of the enzymatic and redox-transduction reactions.…”

Section: Introductionmentioning

confidence: 99%

Thermally stable improved first-generation glucose biosensors based on Nafion/glucose-oxidase modified heated electrodes

Tseng

Yang

Chuang

et al. 2009

Electrochemistry Communications

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We illustrate how the use of heated electrodes enhances the performance of glucose biosensors based on amperometric detection of the glucose-oxidase generated hydrogen peroxide. Nafion is shown to be an excellent matrix to protect glucose oxidase from thermal inactivation during the heating pulses. The influence of the electrode temperature upon the amperometric response is examined. Temperature pulse amperometry (TPA) has been used to obtain convenient peak-shaped analytical signals. Surprisingly, up to 67.5 °C, the activity of Nafion-entrapped glucose oxidase is greatly enhanced (24 -fold) by accelerated kinetics rather than decreased by thermal inactivation. Amperometric signals even at elevated temperatures are stable upon prolonged operation involving repetitive measurements. The linear calibration range is significantly extended.

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Temperature pulse modulated amperometry at compact electrochemical sensors

Cited by 18 publications

References 23 publications

Directly Heated Bismuth Film Electrodes Based on Gold Microwires

Directly Heated Bismuth Film Electrodes Based on Gold Microwires

Thermal Modulation of Nanomotor Movement

Thermally stable improved first-generation glucose biosensors based on Nafion/glucose-oxidase modified heated electrodes

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