A Low-Power Integrated Humidity CMOS Sensor by  Printing-on-Chip Technology

Lee, Chang-Hung; Chuang, Wei‐Ching; Cowan, Melissa A.; Wu, Wen-Jung; Lin, Chih‐Ting

doi:10.3390/s140509247

Cited by 10 publications

(4 citation statements)

References 29 publications

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“…To improve the poor uniformity of structure, new paper modification approaches based on the papermaking process, such as addition of chemical reagents during the pulping process [142], can be used to produce special functional papers. Finally, hydrophobic patterning and barrier modification approaches will be further developed for integration with paperbased electronic chips [143].…”

Section: Conclusion and Future Perspectivesmentioning

confidence: 99%

A review on advances in methods for modification of paper supports for use in point-of-care testing

et al. 2019

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Paper is a widely used support for use in devices for point-of-care testing (POCT) in clinical diagnosis, food safety monitoring and environmental pollution. Paper is inexpensive, biocompatible, biodegradable and allows a sample fluid to flow by capillary force. Numerous method have been developed recently for chemical modification of papers in order to introduce different functionalities. This review (with 148 refs.) summarizes the recent progress in paper-based POCT devices. The introduction summarizes the state of the art of paper-based POCT devices and the physicochemical properties of existing unmodified materials (including cellulose, cellulose-based composites, cotton fibers, glass fibers, nitrocellulose, thread). Methods for paper modification for sample pretreatment are summarized next, with subsections on sample storage and collection, sample separation, nucleic acid extraction and sample preconcentration. Another main section covers approaches for paper modification for improving POCTs, with subsections on assays for proteins, nucleic acids, drugs, ion and organic molecules. The advantages and disadvantages of these approaches are compared. Several tables are presented that summarize the various modification techniques. A concluding section summarizes the current status, addresses challenges and gives an outlook on future perspectives of POCTs.

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Section: Conclusion and Future Perspectivesmentioning

confidence: 99%

A review on advances in methods for modification of paper supports for use in point-of-care testing

et al. 2019

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“…The response time of PEDOT:PSS based humidity sensor was highly improved ($1 s) by adding iron oxide nanoparticles, 4 keeping the humidity sensing range for linear response still limited to . A low power CMOS-based AZO/PEDOT:PSS sensor 19 has been used for humidity sensing (0-75% RH), but the resistance of the sensing layer is doubled within 40 days because of the change in the structure of PEDOT:PSS chains by the absorption of moisture and oxygen.…”

Section: Introductionmentioning

confidence: 99%

Humidity Sensor Based on PEDOT:PSS and Zinc Stannate Nano-composite

Aziz

Chang

Doh

et al. 2015

Journal of Elec Materi

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A composite of poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) and zinc stannate (ZnSnO 3 ) has been introduced for impedancebased humidity sensing, owing to its high sensitivity, good stability, very fast response ($0.2 s) and recovery time ($0.2 s), small hysteresis, repeatability, low-cost fabrication and wide range of sensitivity. Both materials were mixed in three different weight percentage ratios, to optimize the performance of the sensors. Best response was observed for 5 wt.% PEDOT:PSS and 5 wt.% ZnSnO 3 . The impedance of the sensor was dropped immensely from 1.5 MX to 50 kX by changing relative humidity from 0% to 90%. The reason for this improvement in sensitivity was analyzed by virtue of sensing mechanisms and different characterizations (three dimensional (3D) nano-profiler, optical microscope, and fourier transform infra-red (FTIR) spectroscopy) revealing the surface morphology and chemical structure of the film. Due to its response and ability to sense human breath and skin humidity, it is suitable for environmental, artificial skin and food industry applications.

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“…In an environment monitoring system, power consumption is one of the most critical and challenging design considerations in developing sensors as well as relevant interface/control circuits. To develop a low-power and low-cost environmental monitoring system, polymer composites are adopted for humidity and CO 2 sensing because of their high sensitivity, reasonable response time, low manufacturing cost, and low power consumption for operations [ 18 ]. Additionally, functional groups on polymer backbones can be adjusted by co-polymerization or structure derivations for different sensing targets [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

A Self-Sustained Wireless Multi-Sensor Platform Integrated with Printable Organic Sensors for Indoor Environmental Monitoring

Chuang

et al. 2017

Sensors

Self Cite

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A self-sustained multi-sensor platform for indoor environmental monitoring is proposed in this paper. To reduce the cost and power consumption of the sensing platform, in the developed platform, organic materials of PEDOT:PSS and PEDOT:PSS/EB-PANI are used as the sensing films for humidity and CO2 detection, respectively. Different from traditional gas sensors, these organic sensing films can operate at room temperature without heating processes or infrared transceivers so that the power consumption of the developed humidity and the CO2 sensors can be as low as 10 μW and 5 μW, respectively. To cooperate with these low-power sensors, a Complementary Metal-Oxide-Semiconductor (CMOS) system-on-chip (SoC) is designed to amplify and to read out multiple sensor signals with low power consumption. The developed SoC includes an analog-front-end interface circuit (AFE), an analog-to-digital convertor (ADC), a digital controller and a power management unit (PMU). Scheduled by the digital controller, the sensing circuits are power gated with a small duty-cycle to reduce the average power consumption to 3.2 μW. The designed PMU converts the power scavenged from a dye sensitized solar cell (DSSC) module into required supply voltages for SoC circuits operation under typical indoor illuminance conditions. To our knowledge, this is the first multiple environmental parameters (Temperature/CO2/Humidity) sensing platform that demonstrates a true self-powering functionality for long-term operations.

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A Low-Power Integrated Humidity CMOS Sensor by Printing-on-Chip Technology

Cited by 10 publications

References 29 publications

A review on advances in methods for modification of paper supports for use in point-of-care testing

A review on advances in methods for modification of paper supports for use in point-of-care testing

Humidity Sensor Based on PEDOT:PSS and Zinc Stannate Nano-composite

A Self-Sustained Wireless Multi-Sensor Platform Integrated with Printable Organic Sensors for Indoor Environmental Monitoring

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