Recent advances in organic sensors for health self-monitoring systems

Lee, Yoon Ho; Kweon, O. Young; Kim, Hongki; Yoo, Jong Heun; Han, Seul Gi; Oh, Joon Hak

doi:10.1039/c8tc02230e

Cited by 114 publications

(71 citation statements)

References 214 publications

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“…Here, we introduce a flexible glove-based sensing system that offers simultaneous real-time monitoring of pressure and chemical signals. The combination of physical and chemical sensing has rarely been reported, and chemical, pressure, and temperature signals are usually monitored separately in health monitoring devices, 12 with the exception of a recent example of an epidermal biomedical electrocardiogram-lactate patch. 13 Temperature measurements have been combined with the reading of different signals, including biochemical or electrophysiological signals, pressure, and/or strain.…”

Section: Conceptual Insightsmentioning

confidence: 99%

“…To provide tactile feedback, pressure sensors based on piezoelectric, resistive, or capacitive mechanisms are available. 12,[17][18][19] For targeted applications, capacitive pressure sensors are preferred due to the advantages of low sensitivity to temperature and relative humidity changes, low power consumption, high reproducibility, and static pressure detection capability. 18,20,21 The sensitivity of a capacitive sensor is tunable by adjusting the dielectric compressibility; for instance, the sensitivity is increased by choosing softer materials, i.e.…”

Section: Conceptual Insightsmentioning

confidence: 99%

“…20 Indeed, the sensitivity of porous structures was found to be around 1-2 orders of magnitude higher compared to that of non-porous dielectrics using the same material. [22][23][24][25] Porous structures with well-defined patterns usually exhibit higher sensitivity than arbitrary patterns; 12,21,23 however, their fabrication is highly complex. Here, the foam structures of the pressure sensors are easy to fabricate and are optimized by air-to-solid volume ratios for sensitivity and reproducibility to the range of pressures typical for object manipulation in the low (1-10 kPa) and medium (10-30 kPa) pressure regimes.…”

Section: Conceptual Insightsmentioning

confidence: 99%

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Point-of-use robotic sensors for simultaneous pressure detection and chemical analysis

et al. 2019

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The development of sensors for monitoring hazardous materials in security and environmental applications has been increasing in the last few years. In particular, organophosphates pose a serious health threat that affects the food and agriculture industries. Hence, their rapid on-site detection is highly desired, especially through remote robotic sampling that can minimize the exposure of humans to these hazardous chemicals. To handle sample collection, a robotic manipulator requires tactile feedback, to ensure that no damage will be done to either the robot or the other object in contact due to excessive force. To provide tactile feedback, porous polydimethylsiloxane pressure sensors based on a capacitive mechanism were chosen here, and integrated with enzyme-based electrochemical sensors specific for organophosphate compounds (e.g. methyl paraoxon). This results in a hybrid physical-chemical sensing glove that can simultaneously measure the pressure and chemical target without interference between the two sensors. Our pressure sensors showed 455% relative capacitance change per 10 kPa applied pressure, with an average sensitivity (S) of 0.057 AE 0.004 kPa À1 in the 3-20 kPa range and a maximum sensitivity of 0.30 AE 0.08 kPa À1 in the o0.05 kPa range. The chemical biosensors showed a detection range of 20-180 lM for methyl paraoxon in the liquid phase. We have thus combined low-cost chemical and pressure sensors together on disposable, retrofitting gloves, and demonstrated simultaneous tactile sensing and organophosphate pesticide detection in a point-of-use robotic field platform that is scalable, economical, and adaptable for different security, environmental, and food-safety applications.

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Section: Conceptual Insightsmentioning

confidence: 99%

Section: Conceptual Insightsmentioning

confidence: 99%

Section: Conceptual Insightsmentioning

confidence: 99%

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Point-of-use robotic sensors for simultaneous pressure detection and chemical analysis

et al. 2019

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“…[3][4][5][6] Recently, biocompatible flexible conductive composite fibers have attracted great research interest due to their multitude of potential applications, such as wearable devices, biomedical sensors, and actuators. [7][8][9][10] Silk-based conductive fibers have been considered to be ideal candidates for such applications. Currently, some studies on the fabrication and application of silk-based conductive composite fibers have been reported.…”

Section: Introductionmentioning

confidence: 99%

Wet‐Spinning Fabrication of Flexible Conductive Composite Fibers from Silver Nanowires and Fibroin

Lü

Jiang

Park

et al. 2020

Bulletin Korean Chem Soc

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Biocompatible flexible conductive composite fibers have attracted great research interest because of multitude of their potential applications, such as wearable devices, biomedical sensors, and actuators. Herein, highly conductive and flexible silver nanowire (AgNW)/fibroin composite fibers were fabricated by using a wet‐spinning technique. The composite fiber conductivity was as high as 5670 S/cm at an AgNW concentration of 29.1 wt%. The composite fibers also exhibited high flexibilities and could be folded without losing their conductivities. Furthermore, the composite fiber fabricated with a 3× draw ratio exhibited a breaking strain of 27.3% and breaking stress of 118.1 cN/dtex. Our attempt to produce such biocompatible flexible conductive composite fibers by using sustainable regenerated silk fibroins and compatible AgNWs via wet spinning may provide a practical way for fabricating functional biocompatible fiber materials.

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“…In today's state-of-the-art of semiconductor technologies, organic semiconductors have both demonstrated their ability to achieve technological applications at the consumer-electronic market-level [1,2], and continues to inspire the scientific community by unlocking truly disruptive abilities to realize next-generation electronics [3][4][5]. For their potentials for lowcost electronics [6], soft processing, and device added features such as flexibility or transparency [7], these materials have been widely investigated in a range of microelectronic and optoelectronic architectures such as field-effect transistors [8], light-emitting PN-diodes (OLEDs) [9], Schottky diodes [10] and single carrier sensing devices [11]. In any of these applications, significant improvements in the electrical performances [12][13][14] can be achieved by means of molecular doping (i.e., chemical doping by incorporating highly electronaccepting/donating molecules into the organic semiconductor).…”

Section: Introductionmentioning

confidence: 99%

Concentration-control in all-solution processed semiconducting polymer doping and high conductivity performances

et al. 2020

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Simultaneously optimizing performances, processability and fabrication cost of organic electronic materials is the continual source of compromise hindering the development of disruptive applications. In this work, we identified a strategy to achieve record conductivity values of one of the most benchmarked semiconducting polymers by doping with an entirely solution-processed, water-free and cost-effective technique. High electrical conductivity for poly(3-hexylthiophene) up to 21 S/cm has been achieved, using a commercially available electron acceptor as both a Lewis acid and an oxidizing agent. While we managed water-free solution-processing a three-time higher conductivity for P3HT with a very affordable/available chemical, near-field microscopy reveals the existence of concentrationdependent higher-conductivity micro-domains for which furthermore process optimization might access to even higher performances. In the perpetual quest of reaching higher performances for organic electronics, this work shall greatly unlock applications maturation requiring higher-scale processability and lower fabrication costs concomitant of higher performances and new functionalities, in the current context where understanding the doping mechanism of such class of materials remains of the greatest interest.

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Recent advances in organic sensors for health self-monitoring systems

Abstract: This review describes the development status of organic sensors for health-monitoring systems and the strategies to enhance their performance.

Cited by 114 publications

References 214 publications

Point-of-use robotic sensors for simultaneous pressure detection and chemical analysis

Point-of-use robotic sensors for simultaneous pressure detection and chemical analysis

Wet‐Spinning Fabrication of Flexible Conductive Composite Fibers from Silver Nanowires and Fibroin

Concentration-control in all-solution processed semiconducting polymer doping and high conductivity performances

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