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      An Active Self-Driven Piezoelectric Sensor Enabling Real-Time Respiration Monitoring

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          Abstract

          In this work, we report an active respiration monitoring sensor based on a piezoelectric-transducer-gated thin-film transistor (PTGTFT) aiming to measure respiration-induced dynamic force in real time with high sensitivity and robustness. It differs from passive piezoelectric sensors in that the piezoelectric transducer signal is rectified and amplified by the PTGTFT. Thus, a detailed and easy-to-analyze respiration rhythm waveform can be collected with a sufficient time resolution. The respiration rate, three phases of respiration cycle, as well as phase patterns can be further extracted for prognosis and caution of potential apnea and other respiratory abnormalities, making the PTGTFT a great promise for application in long-term real-time respiration monitoring.

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          A stretchable carbon nanotube strain sensor for human-motion detection.

          Yuki Yamamoto, Yoshiki Yomogida, Yuki Yamamoto … (2011)
          Devices made from stretchable electronic materials could be incorporated into clothing or attached directly to the body. Such materials have typically been prepared by engineering conventional rigid materials such as silicon, rather than by developing new materials. Here, we report a class of wearable and stretchable devices fabricated from thin films of aligned single-walled carbon nanotubes. When stretched, the nanotube films fracture into gaps and islands, and bundles bridging the gaps. This mechanism allows the films to act as strain sensors capable of measuring strains up to 280% (50 times more than conventional metal strain gauges), with high durability, fast response and low creep. We assembled the carbon-nanotube sensors on stockings, bandages and gloves to fabricate devices that can detect different types of human motion, including movement, typing, breathing and speech.
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            Stretchable, Skin-Mountable, and Wearable Strain Sensors and Their Potential Applications: A Review

            Morteza Amjadi, Ki-Uk Kyung, Inkyu Park … (2016)
            Article 0 comments Cited 746 times – based on 0 reviews     Review now
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              Flexible suspended gate organic thin-film transistors for ultra-sensitive pressure detection

              Yaping Zang, Fengjiao Zhang, Dazhen Huang … (2015)
              The utilization of organic devices as pressure-sensing elements in artificial intelligence and healthcare applications represents a fascinating opportunity for the next-generation electronic products. To satisfy the critical requirements of these promising applications, the low-cost construction of large-area ultra-sensitive organic pressure devices with outstanding flexibility is highly desired. Here we present flexible suspended gate organic thin-film transistors (SGOTFTs) as a model platform that enables ultra-sensitive pressure detection. More importantly, the unique device geometry of SGOTFTs allows the fine-tuning of their sensitivity by the suspended gate. An unprecedented sensitivity of 192 kPa−1, a low limit-of-detection pressure of <0.5 Pa and a short response time of 10 ms were successfully realized, allowing the real-time detection of acoustic waves. These excellent sensing properties of SGOTFTs, together with their advantages of facile large-area fabrication and versatility in detecting various pressure signals, make SGOTFTs a powerful strategy for spatial pressure mapping in practical applications.
              Article 0 comments Cited 166 times – based on 0 reviews     Review now
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                Author and article information

                Journal
                Journal ID (nlm-ta): Sensors (Basel)
                Journal ID (iso-abbrev): Sensors (Basel)
                Journal ID (publisher-id): sensors
                Title: Sensors (Basel, Switzerland)
                Publisher: MDPI
                ISSN (Electronic): 1424-8220
                Publication date (Electronic): 23 July 2019
                Publication date Collection: July 2019
                Volume: 19
                Issue: 14
                Electronic Location Identifier: 3241
                Affiliations
                [1 ]Guangdong Province Key Laboratory of Display Material and Technology, State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Sun Yat-sen University, No. 132 East Waihuan Road, Guangzhou 510006, China
                [2 ]Sun Yat-sen University Shunde Research Institute, No. 9 Eastern Nanguo Road, Shunde District, Foshan 523800, China
                Author notes
                Author information
                https://orcid.org/0000-0003-0154-0175
                https://orcid.org/0000-0003-2006-5760
                Article
                Publisher ID: sensors-19-03241
                DOI: 10.3390/s19143241
                PMC ID: 6679499
                PubMed ID: 31340564
                SO-VID: 77345194-8b88-4f8f-b9b5-10625f372b69
                Copyright © © 2019 by the authors.
                License:

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                Date received : 13 June 2019
                Date accepted : 18 July 2019
                Categories
                Subject: Article

                ScienceOpen disciplines: Biomedical engineering
                Keywords: thin-film transistor,piezoelectric transducer,active sensor,self-driven sensor,respiration monitoring
                Data availability:
                ScienceOpen disciplines: Biomedical engineering
                Keywords: thin-film transistor, piezoelectric transducer, active sensor, self-driven sensor, respiration monitoring

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