Performance of capacitive cantilever sensor for portable heavy metal ion detector

Tan, Yoong Teng (2024) Performance of capacitive cantilever sensor for portable heavy metal ion detector. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Heavy-metal ions (HMIs) are environmental pollutants that readily react with biological matter to cause serious toxicological and carcinogenic effects on body systems and vital organs. Access to safe drinking water remains a pressing global concern, affecting one in three people worldwide, while the presence of heavy metal ions (HMIs) in water sources poses a severe health threat even at trace levels. The challenge lies in efficiently detecting these pollutants on-site, as existing methods often lack the necessary efficiency, portability, and affordability, hampering early pollution warnings, regulatory enforcement, and decentralized water monitoring efforts. Thus, this project is to analyze the performance of the microcantilever beam by observing the maximum deflection with respect to force applied where the force acts as the mass of HMIs detected. COMSOL 5.5 software was first implemented to determine the best sensing materials that will result in maximum deflection based on different properties such as Young Modulus and Poisson Ratio which related with Stoney’s formula. ANSYS software was used for conducting a Finite Element Analysis using 4 different Stress Concentration Region which are Rectangular, Square, Circular and Triangular. The performance of the beam was analyzed and compared with and without the presence of SCR. The relationship of the dimension of stress concentration region was determined. At the end of this project, a suitable dimension of cantilever beam was proposed with best sensing material determined along with the stress concentration region that result in maximum deflection. Both results obtained from 2 software were compared with previous studies

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