High-Sensitivity Wearable and Flexible Humidity Sensor Based on Graphene Oxide/Non-Woven Fabric for Respiration Monitoring

Wang, Yamei; Zhang, Liwen; Zhang, Zhenwei; Sun, Peng; Chen, Huawei

doi:10.1021/acs.langmuir.0c01315

Cited by 127 publications

(95 citation statements)

References 36 publications

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“…(c) Silver nanoparticles inkjet printed on paper to fabricate a flexible temperature sensor, reprinted with permission from [14]. (d) Graphene Oxide deposited on fabric for humidity sensing, reprinted with permission from [15]. [12].…”

Section: Figurementioning

confidence: 99%

Review of Materials and Fabrication Methods for Flexible Nano and Micro-Scale Physical and Chemical Property Sensors

et al. 2021

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The use of flexible sensors has tripled over the last decade due to the increased demand in various fields including health monitoring, food packaging, electronic skins and soft robotics. Flexible sensors have the ability to be bent and stretched during use and can still maintain their electrical and mechanical properties. This gives them an advantage over rigid sensors that lose their sensitivity when subject to bending. Advancements in 3D printing have enabled the development of tailored flexible sensors. Various additive manufacturing methods are being used to develop these sensors including inkjet printing, aerosol jet printing, fused deposition modelling, direct ink writing, selective laser melting and others. Hydrogels have gained much attention in the literature due to their self-healing and shape transforming. Self-healing enables the sensor to recover from damages such as cracks and cuts incurred during use, and this enables the sensor to have a longer operating life and stability. Various polymers are used as substrates on which the sensing material is placed. Polymers including polydimethylsiloxane, Poly(N-isopropylacrylamide) and polyvinyl acetate are extensively used in flexible sensors. The most widely used nanomaterials in flexible sensors are carbon and silver due to their excellent electrical properties. This review gives an overview of various types of flexible sensors (including temperature, pressure and chemical sensors), paying particular attention to the application areas and the corresponding characteristics/properties of interest required for such. Current advances/trends in the field including 3D printing, novel nanomaterials and responsive polymers, and self-healable sensors and wearables will also be discussed in more detail.

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Section: Figurementioning

confidence: 99%

Review of Materials and Fabrication Methods for Flexible Nano and Micro-Scale Physical and Chemical Property Sensors

et al. 2021

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“…These flexible sensors were bent 8000 times and remained operable, demonstrating their excellent flexibility and reliability for industrial applications. Another humidity sensor based on non-woven fabric and graphene oxide was developed in 2020 for respiration monitoring to support healthcare delivery in response to the COVID19 pandemic [10]. The researchers claim that the non-woven material ranks above polymer materials when fabricating flexible sensors due to the poor hygroscopicity and breathability of polymers which limits their comfortability and sensitivity.…”

Section: Humidity Sensorsmentioning

confidence: 99%

Review of Materials and Fabrication Methods for Flexible Nano and Micro-Scale Physical Property Sensors

Nyabadza¹,

Vázquez²,

Coyle³

et al. 2021

Preprint

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The use of flexible sensors has tripled over the last decade due to the increased demand in various fields including health monitoring, food packaging, electronic skins and soft robotics. Flexible sensors have the ability to be bent and stretched during use and can still maintain their electrical and mechanical properties. This gives them an advantage over rigid sensors that lose their sensitivity when subject to bending. Advancements in 3D printing have enabled the development of tailored flexible sensors. Various additive manufacturing methods are being used to develop these sensors including inkjet printing, aerosol jet printing, fused deposition modelling, direct ink writing, selective laser melting and others. Hydrogels have gained much attention in the literature due to their self-healing and shape transforming. Self-healing enables the sensor to recover from damages such as cracks and cuts incurred during use and this enables the sensor to have a longer operating life and stability. Various polymers are used as substrates on which the sensing conductive material is placed. Polymers including polydimethylsiloxane (PDMS), polyvinyl acetate (PVA), and Kapton are extensively used in flexible sensors. The most widely used nanomaterials in flexible sensors are carbon and silver, however, other nanomaterials such as iron, copper, manganese dioxide and gold are also used to provide controlled levels of conductivity or other functional properties.

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“…Among these 2D materials, graphene was given great attention due to its excellent properties of high conductivity, the large specific surface area of 2600 m 2 g −1 , being optically transparent and having high chemical stability. Therefore, graphene and its derivative composites were widely investigated for the application of sensing change in humidity like SnO 2 /reduced graphene oxide (RGO) [33], methyl red/graphene flakes [34], black phosphorous (BP)/graphene [35], lignosulfonate/RGO [36], BP/graphene oxide (GO) [37], non-woven fabric/GO [38], orange die/graphene [39], graphene/polyvinyl alcohol (PVA)/SiO 2 [40], chitosan/graphene quantum dots [41], etc. Studies have shown that the structure of graphene has a huge impact on the properties of the humidity sensor; therefore, graphene has been used in different forms with ZnO to enhance the humidity sensing behavior of ZnO.…”

Section: Introductionmentioning

confidence: 99%

High-Performance Humidity Sensor Based on the Graphene Flower/Zinc Oxide Composite

et al. 2021

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Performance of an electronic device relies heavily on the availability of a suitable functional material. One of the simple, easy, and cost-effective ways to obtain novel functional materials with improved properties for desired applications is to make composites of selected materials. In this work, a novel composite of transparent n-type zinc oxide (ZnO) with a wide bandgap and a unique structure of graphene in the form of a graphene flower (GrF) is synthesized and used as the functional layer of a humidity sensor. The (GrF/ZnO) composite was synthesized by a simple sol–gel method. Morphological, elemental, and structural characterizations of GrF/ZnO composite were performed by a field emission scanning electron microscope (FESEM), energy-dispersive spectroscopy (EDS), and an x-ray diffractometer (XRD), respectively, to fully understand the properties of this newly synthesized functional material. The proposed humidity sensor was tested in the relative humidity (RH) range of 15% RH% to 86% RH%. The demonstrated sensor illustrated a highly sensitive response to humidity with an average current change of 7.77 μA/RH%. Other prominent characteristics shown by this device include but were not limited to high stability, repeatable results, fast response, and quick recovery time. The proposed humidity sensor was highly sensitive to human breathing, thus making it a promising candidate for various applications related to health monitoring.

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High-Sensitivity Wearable and Flexible Humidity Sensor Based on Graphene Oxide/Non-Woven Fabric for Respiration Monitoring

Cited by 127 publications

References 36 publications

Review of Materials and Fabrication Methods for Flexible Nano and Micro-Scale Physical and Chemical Property Sensors

Review of Materials and Fabrication Methods for Flexible Nano and Micro-Scale Physical and Chemical Property Sensors

Review of Materials and Fabrication Methods for Flexible Nano and Micro-Scale Physical Property Sensors

High-Performance Humidity Sensor Based on the Graphene Flower/Zinc Oxide Composite

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