High sensitive and fast response humidity sensor based on polymer composite nanofibers for breath monitoring and non-contact sensing

Li, Xifang; Zhuang, Zhuang; Qi, Duo; Zhao, Chengji

doi:10.1016/j.snb.2020.129239

Cited by 118 publications

(73 citation statements)

References 47 publications

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“…The proposed model can be applied to not only temperature sensors but also humidity monitoring, air quality sensing, GPS surveillance, landslide detection [22,23,[36][37][38][39], and other sensors. The ultimate goal of the model is to reduce deployment costs; the contribution of this study would be substantial for deployments with high sensing expenditures for other extreme or critical applications.…”

Section: Other Applicationsmentioning

confidence: 99%

Optimization-Based Approaches for Minimizing Deployment Costs for Wireless Sensor Networks with Bounded Estimation Errors

Hsiao

Lin

Yang

et al. 2021

Sensors

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As wireless sensor networks have become more prevalent, data from sensors in daily life are constantly being recorded. Due to cost or energy consumption considerations, optimization-based approaches are proposed to reduce deployed sensors and yield results within the error tolerance. The correlation-aware method is also designed in a mathematical model that combines theoretical and practical perspectives. The sensor deployment strategies, including XGBoost, Pearson correlation, and Lagrangian Relaxation (LR), are determined to minimize deployment costs while maintaining estimation errors below a given threshold. Moreover, the results significantly ensure the accuracy of the gathered information while minimizing the cost of deployment and maximizing the lifetime of the WSN. Furthermore, the proposed solution can be readily applied to sensor distribution problems in various fields.

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Section: Other Applicationsmentioning

confidence: 99%

Optimization-Based Approaches for Minimizing Deployment Costs for Wireless Sensor Networks with Bounded Estimation Errors

Hsiao

Lin

Yang

et al. 2021

Sensors

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“…The choice of the right functional material for humidity sensors with the desirable properties of high sensitivity, stability, low cost, quick response time, wide range, and low power consumption is, therefore, currently a major research area. Humidity-sensing properties of various functional materials, such as polymers [ 12 ], inorganic semiconductors [ 13 ], and their composites [ 14 ], have already been evaluated to great effect but due to certain drawbacks of these synthesized materials, researchers have begun to explore the sensing behavior of natural materials or biomaterials. Biomaterials offer a green solution for the increasing problems caused by non-environmentally friendly materials that are synthesized in chemical laboratories [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient and Wide Range Humidity Response of Biocompatible Egg White Thin Film

Rehman

Saqib

et al. 2021

Nanomaterials

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Biopolymers are a solution to solve the increasing problems caused by the advances and revolution in the electronic industry owing to the use of hazardous chemicals. In this work, we have used egg white (EW) as the low-cost functional layer of a biocompatible humidity sensor and deposited it on gold (Au) interdigitated electrodes (IDEs) patterned through the state-of-the-art fabrication technology of thermal vacuum evaporation. The presence of hydrophilic proteins inside the thin film of EW makes it an attractive candidate for sensing humidity. Usually, the dependence of the percentage of relative humidity (%RH) on the reliability of measurement setup is overlooked for impedimetric humidity sensors but we have used a modified experimental setup to enhance the uniformity of the obtained results. The characteristics of our device include almost linear response with a quick response time (1.2 s) and fast recovery time (1.7 s). High sensitivity of 50 kΩ/%RH was achieved in the desirable detection range of 10–85%RH. The device size was intentionally kept small for its potential integration in a marketable chip. Results for the response of our fabricated sensor for dry and wet fingertips, along with determining the rate of breathing through the mouth, are part of this study, making it a potential device for health monitoring.

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“…Humidity plays an important role in our daily life, such as in climate forecasting, having strong effects on our human comfort and health, in the form of moisture control in building construction and the proper running of industrial devices (electrical machines and semiconductor electronic device), etc. Humidity measurements also play a vital role in human breath monitoring system technologies [11][12][13][14] and automated manufacturing processes too [15]. Xifang et al, fabricated a humidity sensor from SPEEK/PVB composite nanofibers for breath monitoring and for non-contact sensing applications [13].…”

Section: Introduction 1literature Reviewmentioning

confidence: 99%

“…Humidity measurements also play a vital role in human breath monitoring system technologies [11][12][13][14] and automated manufacturing processes too [15]. Xifang et al, fabricated a humidity sensor from SPEEK/PVB composite nanofibers for breath monitoring and for non-contact sensing applications [13]. Their findings show that the addition of polyvinyl butyral (PVB) considerably improved the sensor properties such as stability, and response and recovery time.…”

Section: Introduction 1literature Reviewmentioning

confidence: 99%

Design and Fabrication of a Fast Response Resistive-Type Humidity Sensor Using Polypyrrole (Ppy) Polymer Thin Film Structures

et al. 2021

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In this research article, an organic polymer based polypyrrole (Ppy) composite material has been synthesized and analyzed for the design and fabrication purposes of a fast-responsive, highly sensitive, and an economical resistive-type novel humidity detection sensor. This humidity sensor most suitably serves the purpose for industrial humidity (i.e., values ranging from low to high) detection applications. First, a polypyrrole composite material (a mixture of polypyrrole, polypyrrole-NiO, polypyrrole-CeO2, and polypyrrole-Nb2O5) has been synthesized by chemical oxidative polymerization method, and then is treated at various temperatures, i.e., 100, 150 and 200 °C, respectively. After this treatment, the synthesized samples were then characterized by using FTIR, SEM, and DTA/TGA techniques for analyzing humidity sensing properties. The polypyrrole samples with the best morphological structure and properties were then incorporated on interdigitated electrodes. For the fabrication purposes of this thin film structure, at first a few drops of polyvinyl alcohol (PVA) were placed over interdigitated electrodes (IDE) and then the synthesized polypyrrole composite was uniformly deposited in the form of a thin film over it. The plots show that this is a good resistive-type humidity detection device for the relative humidity range of 30% to 90%. The response and recovery times of this newly fabricated humidity sensor were reported to be the same as 128 s at room temperature. Additionally, the stability and the repeatability response behavior of this Ppy sensor were verified up to five cycles of multiple repetitions. This presents an excellent stability and repeatability performance of the sensor. Furthermore, the capacitances versus humidity response and recovery properties of the designed sensor were studied too. This illustrates an excellent capacitive verses humidity response and shows a linear and an active behavior. Lastly, the experimental result proves that polypyrrole composite thin film shows a reasonable best performance up to a temperature of 100 °C.

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High sensitive and fast response humidity sensor based on polymer composite nanofibers for breath monitoring and non-contact sensing

Cited by 118 publications

References 47 publications

Optimization-Based Approaches for Minimizing Deployment Costs for Wireless Sensor Networks with Bounded Estimation Errors

Optimization-Based Approaches for Minimizing Deployment Costs for Wireless Sensor Networks with Bounded Estimation Errors

Highly Efficient and Wide Range Humidity Response of Biocompatible Egg White Thin Film

Design and Fabrication of a Fast Response Resistive-Type Humidity Sensor Using Polypyrrole (Ppy) Polymer Thin Film Structures

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