Sensors and other electronic components on flexible substrates: From materials to applications

Stojanović, Goran M.

doi:10.1109/meco.2016.7525679

Cited by 2 publications

(1 citation statement)

References 3 publications

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“…Compared with the above materials, PDMS has better flexibility and it is usually used as a polymer substrate. Combined with the MOEMS (micro optical electronic mechanical system) technique, PDMS has been used in various flexible electronic products, including nodes in the internet of things, medical equipment, solar cells, smart watches, and other devices [7].…”

Section: Introductionmentioning

confidence: 99%

A Force Measurement Method Based on Flexible PDMS Grating

Jin

Yang

et al. 2020

Applied Sciences

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With the rapid development of flexible materials, various high-performance biocompatible flexible sensors have been proposed for specific measurement applications. Among these materials, polydimethylsiloxane (PDMS) is one of the most popular polymers by curing the mixture of pre-polymer (base) and cross-linker (curing agent). In this paper, a force measurement method based on PDMS grating is introduced. The PDMS grating is cast from a commercial master grating, which is precise, low-cost, and easy to follow. The elastic modulus can be controlled by the curing temperature and the mixing ratio. The PDMS grating is tested using a tension testing machine. As the stretching force increases, the grating line-spacing simultaneously increases and the diffraction light spot shifts. By capturing the light spot shift using a camera, the relationship between light spot position and stretching force is established and evaluated. Experimental results show that the linearity (R2) of the proposed method is better than 0.998, adding that the sensitivity is ~0.5–0.7N/mm and the accuracy is up to 0.05N.

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Section: Introductionmentioning

confidence: 99%

A Force Measurement Method Based on Flexible PDMS Grating

Jin

Yang

et al. 2020

Applied Sciences

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Thin flexible lab-on-a-film for impedimetric sensing in biomedical applications

Farooq

Hayat

Zafar

et al. 2022

Sci Rep

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Microfluidic cytometers based on coulter principle have recently shown a great potential for point of care biosensors for medical diagnostics. Here, we explore the design of an impedimetric microfluidic cytometer on flexible substrate. Two coplanar microfluidic geometries are compared to highlight the sensitivity of the device to the microelectrode positions relative to the detection volume. We show that the microelectrodes surface area and the geometry of the sensing volume for the cells strongly influence the output response of the sensor. Reducing the sensing volume decreases the pulse width but increases the overall pulse amplitude with an enhanced signal-to-noise ratio (~ max. SNR = 38.78 dB). For the proposed design, the SNR was adequate to enable good detection and differentiation of 10 µm diameter polystyrene beads and leukemia cells (~ 6–21 µm). Also, a systematic approach for irreversible & strong bond strength between the thin flexible surfaces that make up the biochip is explored in this work. We observed the changes in surface wettability due to various methods of surface treatment can be a valuable metric for determining bond strength. We observed permanent bonding between microelectrode defined polypropylene surface and microchannel carved PDMS due to polar/silanol groups formed by plasma treatment and consequent covalent crosslinking by amine groups. These experimental insights provide valuable design guidelines for enhancing the sensitivity of coulter based flexible lab-on-a-chip devices which have a wide range of applications in point of care diagnostics.

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Sensors and other electronic components on flexible substrates: From materials to applications

Cited by 2 publications

References 3 publications

A Force Measurement Method Based on Flexible PDMS Grating

A Force Measurement Method Based on Flexible PDMS Grating

Thin flexible lab-on-a-film for impedimetric sensing in biomedical applications

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