Force-Sensitive Interface Engineering in Flexible Pressure Sensors: A Review

Tai, Guojun; Wei, Dapeng; Su, Min; Li, Pei; Xie, Lei; Yang, Jun

doi:10.3390/s22072652

Cited by 19 publications

(6 citation statements)

References 150 publications

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“…Compared with the unpatterned PDMS, the microstructured PDMS films enable the device to respond to a wider pressure range with smaller error bars . It is observed that the extent of decrease in Δ I / I 0 reduces with increasing grit sizes of the films, as the size reduction in microstructures increases the compression resistance and leads to reduced film deformation. − For the distribution of microstructures, a larger size is beneficial for increased sensitivity, while a smaller size can reduce the hysteresis caused by the interface adhesion. ,− Although significant change ratios of −54.1 and −52.1% are obtained respectively from PDMS 320# and PDMS 800# , an undesired asymmetric distribution between photocurrent levels is found during loading and unloading. By adopting the PDMS 2000# film with a higher density of a smaller microstructure, a hysteresis of 0.87% in the pressure range of 0–300 kPa is achieved.…”

Section: Resultsmentioning

confidence: 99%

Interface Engineering in Chip-Scale GaN Optical Devices for Near-Hysteresis-Free Hydraulic Pressure Sensing

Luo

et al. 2022

ACS Appl. Mater. Interfaces

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In this work, a compact, near-hysteresis-free hydraulic pressure sensor is presented through interface engineering in a GaN chipscale optical device. The sensor consists of a monolithic GaN-on-sapphire device responsible for light emission and detection and a multilevel microstructured polydimethylsiloxane (PDMS) film prepared through a low-cost molding process using sandpaper as a template. The micropatterned PDMS film functions as a pressure-sensing medium to effectively modulate the reflectance properties at the sapphire interface during pressure loading and unloading. The interface engineering endows the GaN optical device with near-hysteresis-free performance over a wide pressure range of up to 0−800 kPa. Verified by a series of experimental measurements on its dynamic responses, the tiny hydraulic sensor exhibits superior performance in hysteresis, stability, repeatability, and response time, indicating its considerable potential for a broad range of practical applications.

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Section: Resultsmentioning

confidence: 99%

Interface Engineering in Chip-Scale GaN Optical Devices for Near-Hysteresis-Free Hydraulic Pressure Sensing

Luo

et al. 2022

ACS Appl. Mater. Interfaces

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“…Pressure-based text entry is also proposed for smartphones [17,18] which has drawbacks like error-proneness.…”

Section: Related Workmentioning

confidence: 99%

Rethinking Smart Keyboard Layout to Aid Strong Password Creation

Hossain,

Rahman,

Ahmed Rumee

et al. 2024

Jurnal Ilmu Komputer dan Informasi

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In an era marked by increasing digitization and the omnipresence of smartphones, the importance of robustpassword security cannot be overstated. With the ever-growing threat of cyberattacks, there is a pressing needfor user-friendly tools that facilitate the creation of strong and unique passwords. Traditional alphanumerickeyboard layouts (physical or virtual) have remained largely unchanged for decades, relying on the sameQWERTY layout initially designed for typewriters. However, these layouts may not be optimal for generatingstrong passwords. This paper focuses on tailoring virtual keyboard layouts on smartphones specifically forstrong password creation. For this, we have performed extensive user surveys to see if the presence ofdedicated rows for digits and special characters (essential in any strong password) allows users to createstronger passwords compared to regular smartphone keyboard layout. Apart from that, we also investigatedthe optimal assignment of characters, digits, and special characters and their groupings in a single soft key.The findings from the detailed user experiment suggested optimal settings for a smartphone virtual keyboard(for Android) like- diagonal length for good typing speed (approximately between 8.38 and 9.41 cm), andkey density (0.88 to 1.21 keys/cm2) which produces the least error without sacrificing the strength ofpasswords created using those layouts. We hope the outcome of this paper will help designers to aid virtualkeyboard layouts for smartphones that can motivate and create strong passwords without sacrificing usability.

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“…To overcome this, the incorporation of high-deformation materials as electrodes or dielectric layers, in tandem with the engineering of microstructures on these components, enhances sensitivity even under minimal pressure. Various microstructures have been employed on electrodes or dielectric layers, such as pyramids, − columns, − microspheres, , and patterns molded from natural plants with micro/nanostructures. − Despite these advancements, limitations continue to exist with respect to sensitivity, operational pressure range, and methodological complexity.…”

Section: Introductionmentioning

confidence: 99%

All-Fabric Capacitive Pressure Sensors with Piezoelectric Nanofibers for Wearable Electronics and Robotic Sensing

Su,

Fu,

Liu

et al. 2023

ACS Appl. Mater. Interfaces

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Flexible pressure sensors are increasingly sought after for applications ranging from physiological signal monitoring to robotic sensing; however, the challenges associated with fabricating highly sensitive, comfortable, and cost-effective sensors remain formidable. This study presents a high-performance, all-fabric capacitive pressure sensor (AFCPS) that incorporates piezoelectric nanofibers. Through the meticulous optimization of conductive fiber electrodes and P(VDF-TrFE) nanofiber dielectric layers, the AFCPS exhibits exceptional attributes such as high sensitivity (4.05 kPa–1), an ultralow detection limit (0.6 Pa), an extensive detection range (∼100 kPa), rapid response time (<26 ms), and robust stability (>14,000 cycles). The sensor’s porous structure enhances its compressibility, while its piezoelectric properties expedite charge separation, thereby increasing the interface capacitance and augmenting overall performance. These features are elucidated further through multiphysical field-coupling simulations and experimental testing. Owing to its comprehensive superior performance, the AFCPS has demonstrated its efficacy in monitoring human activity and physiological signals, as well as in discerning soft robotic grasping movements. Additionally, we have successfully implemented multiple AFCPS units as pressure sensor arrays to ascertain spatial pressure distribution and enable intelligent robotic gripping. Our research underscores the promising potential of the AFCPS device in wearable electronics and robotic sensing, thereby contributing significantly to the advancement of high-performance fabric-based sensors.

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Force-Sensitive Interface Engineering in Flexible Pressure Sensors: A Review

Cited by 19 publications

References 150 publications

Interface Engineering in Chip-Scale GaN Optical Devices for Near-Hysteresis-Free Hydraulic Pressure Sensing

Interface Engineering in Chip-Scale GaN Optical Devices for Near-Hysteresis-Free Hydraulic Pressure Sensing

Rethinking Smart Keyboard Layout to Aid Strong Password Creation

All-Fabric Capacitive Pressure Sensors with Piezoelectric Nanofibers for Wearable Electronics and Robotic Sensing

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