A novel flexible humidity switch material based on multi-walled carbon nanotube/polyvinyl alcohol composite yarn

Li, Wei; Xu, Fujun; Sun, Lei; Liu, Wei; Qiu, Yiping

doi:10.1016/j.snb.2016.02.108

Cited by 63 publications

(52 citation statements)

References 32 publications

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“…Figure 8 a shows the sensors’ response for several dynamic cycles of absorption/desorption at humidity levels varying from 0 to 70%. It is important to mention that low relative humidity levels were detected with designed miniaturized sensors, introducing a significant improvement in comparison to the other flexible humidity sensors found in the literature [ 40 , 41 , 42 , 43 ]. This can be attributed to the highly porous surface of the printed TiO 2 film, which results in a large surface area providing more surface active sites and paths for water molecule adsorption and diffusion [ 39 ].…”

Section: Resultsmentioning

confidence: 99%

Fabrication and Characterization of Flexible and Miniaturized Humidity Sensors Using Screen-Printed TiO2 Nanoparticles as Sensitive Layer

Dubourg

Segkos

Katona

et al. 2017

Sensors

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This paper describes the fabrication and the characterization of an original example of a miniaturized resistive-type humidity sensor, printed on flexible substrate in a large-scale manner. The fabrication process involves laser ablation for the design of interdigitated electrodes on PET (Poly-Ethylene Terephthalate) substrate and a screen-printing process for the deposition of the sensitive material, which is based on TiO2 nanoparticles. The laser ablation process was carefully optimized to obtain micro-scale and well-resolved electrodes on PET substrate. A functional paste based on cellulose was prepared in order to allow the precise screen-printing of the TiO2 nanoparticles as sensing material on the top of the electrodes. The current against voltage (I–V) characteristic of the sensor showed good linearity and potential for low-power operation. The results of a humidity-sensing investigation and mechanical testing showed that the fabricated miniaturized sensors have excellent mechanical stability, sensing characteristics, good repeatability, and relatively fast response/recovery times operating at room temperature.

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Section: Resultsmentioning

confidence: 99%

Fabrication and Characterization of Flexible and Miniaturized Humidity Sensors Using Screen-Printed TiO2 Nanoparticles as Sensitive Layer

Dubourg

Segkos

Katona

et al. 2017

Sensors

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“…The sensing responses of the humidity sensors were measured using saturated salt solutions. The solutions were prepared by dissolving LiBr (RH 6%), LiCl (RH 11%), C 2 H 3 KO 2 (RH 23%), MgCl 2 (RH 33%), K 2 CO 3 (RH 43%), NaBr (RH 59%), KI (RH 69%), NaCl (RH 75%), KCl (RH 85%), and K 2 SO 4 (RH 97%) into deionized water in test bottle at 25 °C . The commercial hygrometer was applied in this test bottle to calibrate the relative humidity and temperature.…”

Section: Methodsmentioning

confidence: 99%

“…Although those approaches represent significant progress toward fabricating textile‐based humidity sensors, there are major challenges yet to overcome. For instance, the effects of the strip‐shaped humidity sensor, the durability of the sensor performance prepared by coating method, etc …”

Section: Introductionmentioning

confidence: 99%

Full‐Textile Wireless Flexible Humidity Sensor for Human Physiological Monitoring

Patil

et al. 2019

Adv Funct Materials

226

172

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Textile-based electronic techniques that can in real-time and noncontact detect the respiration rate and respiratory arrest are highly desired for human health monitoring. Yarn-shaped humidity sensor is fabricated based on a sensitive fiber with relatively high specific surface area and abnormal cross-section. The response and recovery time of the yarnshaped humidity sensor is only 3.5 and 4 s, respectively, with little hysteresis, because of the hydrophobic property of these functional fibers and the grooves on the surface of the fibers, which is much faster than those of the commercial polyimide materials. Moreover, a batteryfree LC wireless testing system combined with the yarn-shaped sensor is fabricated, which is further successfully imbedded into the intelligent mask to detect human breath. Based on the detection of LC wireless testing system, the frequency of 50.25 MHz under the exhaled condition shifts to 50.86 MHz under the inhaled situation of humidity sensor. In essence, the functional yarns with proper structure, would be an excellent candidature to the yarn-shaped humidity sensor, in which there are good performance and wide application possibilities, eventually offering a facile method for the wireless detection of human physiological signals in the field of electronic fabrics.

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“…Additionally, polymeric materials are the only solution in sensors fabrication when flexibility is required. Polymers such as polypyrrole (PPy), polythiophene (PT), and polyaniline (PANI) have been used in the fabrication of humidity sensors . Among them, polypyrrole has received great attention because it has relatively notable environmental stability, it can be tailored in properties by changing the dopant species and it is easily synthesized.…”

Section: Introductionmentioning

confidence: 99%

UV‐Printable and Flexible Humidity Sensors Based on Conducting/Insulating Semi‐Interpenetrated Polymer Networks

Razza

Blanchet

Lamberti

et al. 2017

Macro Materials & Eng

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Humidity sensors are of great interest in many fields because humidity plays a crucial role in several processes. Nevertheless, their application is often limited by the expensive fabrication and the stiffness of the substrates usually employed. In this work, novel UV‐curable and flexible humidity sensors based on semi‐interpenetrated polymer networks are fabricated. They can be prepared either as self‐standing sensors or applied on different bendable substrates. The fabrication consists of a simultaneous UV‐curing of an insulating network (acrylic or epoxy) and photopolymerization of conducting polypyrrole (PPy). The detection mechanism involves proton transfer on the PPy chains that can be macroscopically observed by electrical impedance variations. These devices show promising humidity‐sensing properties from 20 to 97% of relative humidity with a maximum response of about 180%. The dynamic sensing investigation proves that the recovery process can be tailored playing on the glass transition temperature and wettability of the films. The remarkable sensing capabilities of these sensors make them a valid alternative in many applications where printability and flexibility are required along with simple fabrication method consisting of one‐step synthesis.

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A novel flexible humidity switch material based on multi-walled carbon nanotube/polyvinyl alcohol composite yarn

Cited by 63 publications

References 32 publications

Fabrication and Characterization of Flexible and Miniaturized Humidity Sensors Using Screen-Printed TiO2 Nanoparticles as Sensitive Layer

Fabrication and Characterization of Flexible and Miniaturized Humidity Sensors Using Screen-Printed TiO2 Nanoparticles as Sensitive Layer

Full‐Textile Wireless Flexible Humidity Sensor for Human Physiological Monitoring

UV‐Printable and Flexible Humidity Sensors Based on Conducting/Insulating Semi‐Interpenetrated Polymer Networks

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