利用電熱效應檢測甲基苯丙胺在電化學感測器上之效率研究

宋睿盛

doi:10.6342/NTU201704420

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利用電熱效應檢測甲基苯丙胺在電化學感測器上之效率研究

Simulation on detecting efficiency of methamphetamine in an electrochemical sensor with applying electrothermal effect

宋睿盛 , Masters　　Advisor：趙聖德　　

繁體中文 DOI： 10.6342/NTU201704420

循環伏安法；甲基苯丙胺；電熱效應；電化學感測器；有限元素分析； Cyclic voltammetry ； Methamphetamine ； Electrothermal effect ； Electrochemical sensor ； Finite element analysis

Abstract │ Reference (13) │ Altmetrics

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Due to the chemical properties of some of the reactants that undergo electron transfer on the electrode, this property can be used in studying and designing electrochemical sensor.
In this study, the electrothermal effect was successfully used to improve the detection efficiency of electrochemical sensors. By applying a non-uniform AC electric field to the micro-channel of the electrochemical sensor, the electro-thermal force can be generated, a pair of stirring vortices can be formed to stir the flow field and the diffusion boundary layer on the reaction surface, and hence increase the transport of the analytes to the reaction surface to enhance the peak current generated by the reaction.
In this study, the electron transfer reaction of methamphetamine (MA) on the electrochemical sensor was simulated by finite element software. When the solution is at rest, the reaction is diffusion-controlled. Since the rate of electron transfer of the reactants is greater than the rate of diffusion to the electrode surface, the diffusion boundary layer which would hinder the transport of reactants to the reaction surface. Several crucial factors that affect the formation of the diffusion boundary layer are all discussed in the simulation, including the channel height, the position and angle of the reaction surface, and the magnitude of the voltage provided by the electrothermal effect as well as the electrode position.
It is found that by changing the position of the reaction surface the largest enhancement is found at the position (750,570), under the applied AC field 30 peak-to-peak and operating frequency 100 kHz. The peak current can be raised up to 5.19. Then trying to adjust the reaction surface angle to get the results, and it is found that the peak current can be raised up to 5.44 when the position is at (750,560) and counterclockwise rotation of 45 degrees. Finally, it is found that the peak current can be raised up to 5.76 when the position of electrodes which used to generate the electrothermal effect were placed at the bottom of the micro-channel (on both sides of the reaction surface).
In conclusion, the peak current of the reaction can effectively amplify by applying the electrothermal effect and adjusting the geometric position of the reaction surface, thereby achieving the goal of improving the detection sensitivity. It is expected that the results of the simulation can be applied to the design of the electrochemical sensor in the future.

Reference ( 13 ) 〈TOP〉

[2] Kim, E., Lee, J., Choi, H., Han, E., Park, Y., Choi, H., & Chung, H. (2008). Comparison of methamphetamine concentrations in oral fluid, urine and hair of twelve drug abusers using solid-phase extraction and GC-MS. In Annales de Toxicologie Analytique (Vol. 20, No. 3, pp. 145-153). EDP Sciences
連結：
[3] Miyaguchi, H., Iwata, Y. T., Kanamori, T., Tsujikawa, K., Kuwayama, K., & Inoue, H. (2009). Rapid identification and quantification of methamphetamine and amphetamine in hair by gas chromatography/mass spectrometry coupled with micropulverized extraction, aqueous acetylation and microextraction by packed sorbent. Journal of Chromatography A, 1216(18), 4063-4070.
連結：
[4] Wanklyn, C., Burton, D., Enston, E., Bartlett, C. A., Taylor, S., Raniczkowska, A., ... & Murphy, L. (2016). Disposable screen printed sensor for the electrochemical detection of delta-9-tetrahydrocannabinol in undiluted saliva. Chemistry Central Journal, 10(1), 1
連結：
[5] Rafiee, Banafsheh, Ali Reza Fakhari, and Mohammad Ghaffarzadeh. "Impedimetric and stripping voltammetric determination of methamphetamine at gold nanoparticles-multiwalled carbon nanotubes modified screen printed electrode." Sensors and Actuators B: Chemical 218 (2015): 271-279.
連結：
[6] Švorc, Ľubomír, et al. "Electrochemical behavior of methamphetamine and its voltammetric determination in biological samples using self-assembled boron-doped diamond electrode." Journal of Electroanalytical Chemistry 717 (2014): 34-40
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