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

Ju Li, (Key Laboratory of Targeting Therapy and Diagnosis for Critical Diseases, Henan Province, Key laboratory of Advanced Drug Preparation Technologies, Ministry of Education, Collaborative Innovation Center of New Drug Research and Safety Evaluation, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, 450001, China);(Ministry of Education Key Laboratory for Analytical Science of Food Safety and Biology; Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety, College of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, China.);
Sen Yang, (Key Laboratory of Targeting Therapy and Diagnosis for Critical Diseases, Henan Province, Key laboratory of Advanced Drug Preparation Technologies, Ministry of Education, Collaborative Innovation Center of New Drug Research and Safety Evaluation, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, 450001, China);(Ministry of Education Key Laboratory for Analytical Science of Food Safety and Biology; Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety, College of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, China.);
Jian-Jun Sun, (Ministry of Education Key Laboratory for Analytical Science of Food Safety and Biology; Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety, College of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, China.);

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 (Ts), which is crucial for the heating ability of micro-disk electrodes with coil-heated. Distances between the electrode surface and the bottom of the heated copper wire also has a good linear relationship with Ts (R2 = 1). Considering the costs, 25 mm length of the gold wire is enough to obtain a relative high Ts. In addition, highest Ts 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 temperature has also been studied. It is expectable that the simulation results be used to significantly help the design and operation of electrically heated microsensors in practical applications.