Dependence of Heat Transfer Model on the Structure of Electrically Coil-Heated Microelectrodes

Abstract

Electrically heated microelectrodes have gained much attention in electroanalytical chemistry in recent years. It has been shown that the promotion of mass transport and reaction kinetics at high-temperatures often results in increased current signals. However, there is no study about the heat transfer inner the microelectrodes which is necessary for the design and operation for microsensors. This report introduces a finite element software (COMSOL) to analyze the factors that influence the surface temperature (T_s), which is crucial for the heating ability of micro-disk electrodes with coils. Distances between the electrode surface and the bottom of the heated copper wire also have a good linear relationship with T_s (R² = 1). Considering the cost, 25-mm length of the gold wire is enough to obtain a relatively high T_s. In addition, the highest T_s can be obtained when the electrode material is gold and the diameter of the gold disk is 0.2 mm. The relationship of diameters of heated copper wires with currents to obtain different temperatures has also been studied. It is expectable that the simulation results can be used to significantly help the design and operation of electrically heated microsensors in practical applications.

Keywords

Electrically heated microelectrodes / Heat transfer / Micro-disk / Coil-heated / Model / COMSOL / Temperature distribution

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