A free-standing humidity sensor with high sensing reliability for environmental and wearable detection

Yi, Yangpeiqi; Yu, Chuang; Zhai, Heng; Cheng, Dongxu; Lu, Yong; Chen, Zhongda; Xu, Lulu; Li, Jiashen; Song, Qinwen; Yue, Pengfei; Li, Yi; Li, Yang

doi:10.1016/j.nanoen.2022.107780

Cited by 21 publications

(26 citation statements)

References 27 publications

(32 reference statements)

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“…The oxygen-containing functional groups provided sufficient adsorption sites for the water molecules. Continuous water molecules connected by hydrogen bonds underwent proton jumps, causing changes in the resistance of the oxidated carbonized fabric (OCF), which could reflect the corresponding changes in humidity ( Figure 1 b) [ 33 ].…”

Section: Flexible Sensors For Sensing Humiditymentioning

confidence: 99%

“…Furthermore, the humidity sensor also showed potential for application in a human–computer interface. Yi et al fabricated a freestanding humidity sensor from oxidated carbonized fabric (OCF) and integrated it into control interfaces, such as elevator buttons and combination locks [ 33 ]. The sensor allowed people to use fingertip humidity to transmit commands and perform operations ( Figure 3 f).…”

Section: Flexible Sensors For Sensing Humiditymentioning

confidence: 99%

“… Example of the Grotthuss mechanism: ( a ) illustration of the humidity-sensing mechanism of the PIL (reproduced with permission from [ 32 ]); ( b ) principle of the OCF sensor (reproduced with permission from [ 33 ]). …”

Section: Figurementioning

confidence: 99%

“… Applications of flexible humidity sensors: ( a ) the current signal profiles of human nose breathing and mouth breathing (reproduced with permission from [ 65 ]); ( b ) image of the application of the humidity sensor for monitoring human breath (reproduced with permission from [ 66 ]); ( c ) photos of a SAS diagnosing–treating system with an integrated CEH sensor (reproduced with permission from [ 67 ]); ( d ) a TiO 2 /CNC humidity sensor used in a moisturization experiment, in which a commercial skin moisture detector was used as a reference (marked as “C”) (reproduced with permission from [ 68 ]); ( e ) schematic illustration of MPHS for detecting exhaled air during speaking (reproduced with permission from [ 69 ]); ( f ) proof-of-concept of non-contact fingertip interfaces (reproduced with permission from [ 33 ]). …”

Section: Figurementioning

confidence: 99%

See 3 more Smart Citations

An Overview of Flexible Sensors: Development, Application, and Challenges

Liu

Zhang

et al. 2023

Sensors

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The emergence and advancement of flexible electronics have great potential to lead development trends in many fields, such as “smart electronic skin” and wearable electronics. By acting as intermediates to detect a variety of external stimuli or physiological parameters, flexible sensors are regarded as a core component of flexible electronic systems and have been extensively studied. Unlike conventional rigid sensors requiring costly instruments and complicated fabrication processes, flexible sensors can be manufactured by simple procedures with excellent production efficiency, reliable output performance, and superior adaptability to the irregular surface of the surroundings where they are applied. Here, recent studies on flexible sensors for sensing humidity and strain/pressure are outlined, emphasizing their sensory materials, working mechanisms, structures, fabrication methods, and particular applications. Furthermore, a conclusion, including future perspectives and a short overview of the market share in this field, is given for further advancing this field of research.

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Section: Flexible Sensors For Sensing Humiditymentioning

confidence: 99%

Section: Flexible Sensors For Sensing Humiditymentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Section: Figurementioning

confidence: 99%

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An Overview of Flexible Sensors: Development, Application, and Challenges

Liu

Zhang

et al. 2023

Sensors

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show abstract

“…With the rapid increase in the requirements by humans for environmental safety, many nondestructive and real-time sensors have been widely concerned in contaminant detection. − To obtain more efficient and fast information on pollutants in an complex environment, researchers have constructed various sensors, such as electrochemical sensors and optical sensors. − Electrochemical sensors can usually only detect a single species at a time, , which has natural limitations in the field of environmental detection. In comparison to electrochemical sensors, optical sensors (mass spectrometry, fluorescent spectrometry, and spectrophotometry) make it easy to achieve sensitive detection of a wide range of contaminants.…”

mentioning

confidence: 99%

Flexible Cascaded Wire-in-Cavity-in-Bowl Structure for High-Performance and Polydirectional Sensing of Contaminants in Microdroplets

Pei

et al. 2023

J. Phys. Chem. Lett.

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To improve the drawback of surface-enhanced Raman scattering (SERS) sensors that are sensitive to excitation angles and realize the monitoring of contaminants in complex environments, we have proposed and prepared a cascaded wire-in-cavity-in-bowl (WICIB) structure on flexible polydimethysiloxane, with feasibility for plasmonic coupling. We demonstrated that the WICIB structure can serve as a highly sensitive, homogeneous, and stable SERS substrate for conventional detection. The plasmonic coupling and distribution of the enhanced electromagnetic field were evidently proven by finite element simulations, and the strong electromagnetic field was regulated around the wire and inside the cavity, which is very beneficial for the polydirectional and in situ detection. By virtue of the triple synergistic enhancement effect and unique optical properties, we successfully achieved the in situ detection of the residual pollutant molecules, ziram and 2-naphthalenethiol, in microdroplets of apple juice and lake water. Accordingly, such a flexible SERS sensor exhibits great potential in on-site environmental monitoring.

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Environmental Stability Stretchable Organic Hydrogel Humidity Sensor for Respiratory Monitoring with Ultrahigh Sensitivity

Ni,

Zang,

Yang

et al. 2024

Adv Funct Materials

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Real‐time monitoring of respiration plays a very important role in human health assessment, especially in monitoring and analyzing respiration during exercise and sleep. However, traditional humidity sensors still have problems in flexibility, sensitivity, and durability, so there is an urgent need to develop humidity sensors with high sensitivity, stretchability, and environmental resistance as respiratory monitoring applications. Here, based on the double network hydrogel structure of polyvinyl alcohol and polyacrylamide, a highly sensitive, highly stretchable, and environmentally stable organic hydrogel humidity sensor has been manufactured by using the synergistic effect of lithium chloride and MXene. The hydrogel humidity sensor shows rapid response in the humidity range of 40–85% RH, and has a high sensitivity of −103.4%/% RH. In addition, it exhibits more than 3000% mechanical strain and excellent environmental resistance, which is attributed to the chemical cross‐linking in the hydrogel network and the synergistic effect of multiple hydroxyl groups in glycerol forming rich hydrogen bonds with water and polymer chains. The hydrogel humidity sensor is used for real‐time monitoring of breathing and sleep processes. This work provides a new strategy for preparing high‐performance, extensibility, and environmental stability hydrogel‐based sensors for respiratory monitoring.

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A free-standing humidity sensor with high sensing reliability for environmental and wearable detection

Cited by 21 publications

References 27 publications

An Overview of Flexible Sensors: Development, Application, and Challenges

An Overview of Flexible Sensors: Development, Application, and Challenges

Flexible Cascaded Wire-in-Cavity-in-Bowl Structure for High-Performance and Polydirectional Sensing of Contaminants in Microdroplets

Environmental Stability Stretchable Organic Hydrogel Humidity Sensor for Respiratory Monitoring with Ultrahigh Sensitivity

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