Two-Dimensional Array Sinusoidal Waves Conductor for Biometric Measurements

Two-Dimensional Array Sinusoidal Waves Conductor for Biometric Measurements

<italic>Goal:</italic> For personalized clinical applications, flexible conductors require both high electrical conductivity and resistance to stretching and bending. Here, we developed a two-dimensional array sinusoidal wave (TDAS) conductor, characterized its electrical properties unde...

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Bibliographic Details
Main Authors: Homare Yamada, Risa Kawai, Risako Niwa, Kosuke Tsukada
Format: Article
Language:English
Published: IEEE 2025-01-01
Series:IEEE Open Journal of Engineering in Medicine and Biology
Subjects:
Bioinstrumentation
flexible conductor
microfabrication
two-dimensional array sinusoidal waves
Online Access:https://ieeexplore.ieee.org/document/10463112/
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Summary:<italic>Goal:</italic> For personalized clinical applications, flexible conductors require both high electrical conductivity and resistance to stretching and bending. Here, we developed a two-dimensional array sinusoidal wave (TDAS) conductor, characterized its electrical properties under stretching and bending loads, and measured photoelectric pulse waves. <italic>Methods:</italic> TDAS structures with wavelengths of 500&#x2212;2000 &#x03BC;m and amplitudes of 50&#x2212;200 &#x03BC;m were microfabricated on Al substrates. These structures were then transferred to dimethylpolysiloxane, followed by Au sputtering to obtain TDAS conductors. <italic>Results:</italic> TDAS conductors with a 200-&#x03BC;m amplitude suppressed the increase in resistance to stretching and bending and maintained conductivity &gt;30&#x0025; stretching. The small cracks in the valleys observed with electron microscopy contributed to its stretching properties. The connection of LEDs and photodiodes to the TDAS conductors enabled fingertip pulse wave detection. <italic>Conclusions:</italic> Film-type TDAS conductors, which can maintain high conductivity during stretching and bending, have potential for stress-free physiological monitoring of organs such as the heart as well as the body surface.
ISSN:2644-1276

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