Optimalisation of laser parameters for patterning of gold thin film electrodes

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Supervisor:
Dr. Sántha Hunor
Department of Electronics Technology

Abstract

Patterned gold thin films are often used as working electrodes for applied electrochemical biosensor research and development by the Sensors and Microfluidics Laboratory at BME-ETT.

In electrochemistry current densities are measured to monitor the surface processes indicating the binding of the target molecules. For this purpose the reproducible geometrical area and quality of the gold thin film electodes are essential requirements in order to gain comparible results. The aim of my work was the optimazition of the department’s Nd:YAG laser’s parameters (e.g. current, repetition rate, laser beam velocity) for the ablation based gold thin film electrode fabrication. During this work I also determined and minimized the effects of unwanted conditions (such as laser beam distortion, leveling of the work space) causing significant deviations during the fabrication process.

By executing the planned measurement series I managed to optimize the laser parameters for the ablation process and I managed to fabricate electrodes with better resolution and smaller geometrical area deviation then any previous versions. The branch size of the optimized interdigitated type electrode was 42 µm with an average deviation of 3 µm.

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