High-performance humidity sensor based on graphitic carbon nitride/polyethylene oxide and construction of sensor array for non-contact humidity detection

Zhou, Lanjuan; Wang, Mengyu; Liu, Zihao; Guan, Jingrun; Li, Tingting; Zhang, Dongzhi

doi:10.1016/j.snb.2021.130219

Cited by 45 publications

(29 citation statements)

References 55 publications

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“…Therefore, the demand for humidity sensors to be used in respiration monitoring is growing at a tremendous rate 4 , 5 . However, applications of conventional humidity sensors are generally limited by their large size, low sensitivity, nonnegligible temperature drift and slow responses 6 , 7 . Following the development of microelectromechanical systems (MEMSs) in recent decades, miniaturized humidity sensors designed using several different principles, including capacitive, resistive, resonant and optical sensors, have been developed 8 – 13 .…”

Section: Introductionmentioning

confidence: 99%

A nanoforest-based humidity sensor for respiration monitoring

Chen

Guan²,

Shi

et al. 2022

Microsyst Nanoeng

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Traditional humidity sensors for respiration monitoring applications have faced technical challenges, including low sensitivity, long recovery times, high parasitic capacitance and uncalibrated temperature drift. To overcome these problems, we present a triple-layer humidity sensor that comprises a nanoforest-based sensing capacitor, a thermistor, a microheater and a reference capacitor. When compared with traditional polyimide-based humidity sensors, this novel device has a sensitivity that is improved significantly by 8 times within a relative humidity range of 40–90%. Additionally, the integration of the microheater into the sensor can help to reduce its recovery time to 5 s. The use of the reference capacitor helps to eliminate parasitic capacitance, and the thermistor helps the sensor obtain a higher accuracy. These unique design aspects cause the sensor to have an excellent humidity sensing performance in respiration monitoring applications. Furthermore, through the adoption of machine learning algorithms, the sensor can distinguish different respiration states with an accuracy of 94%. Therefore, this humidity sensor design is expected to be used widely in both consumer electronics and intelligent medical instrument applications.

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Section: Introductionmentioning

confidence: 99%

A nanoforest-based humidity sensor for respiration monitoring

Chen

Guan²,

Shi

et al. 2022

Microsyst Nanoeng

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“…Among all kinds of external stimuli, humidity is a convenient, fast, and safe stimulus since human breath is rich in humid air that can trigger a large humidity change. Scientists have developed various materials to sense and visualize the humidity change. − Compared to other humidity-sensing materials, humidity-responsive photonic crystals (HPCs) show a readable color change and require neither reading equipment nor energy supply. Based on these properties, HPCs are an ideal material for anticounterfeiting application and deserve further investment.…”

Section: Introductionmentioning

confidence: 99%

Scalable and Sensitive Humidity-Responsive Polymer Photonic Crystal Films for Anticounterfeiting Application

Shen

et al. 2022

ACS Appl. Mater. Interfaces

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In this study, we fabricate a new kind of ultrasensitive humidity-responsive photonic crystal (HPC) films based on emulsion polymerization and the open mill and bending-induced ordering technique (OM-BIOT) method, which is simple and scalable. The HPC film senses relative humidity (RH) from 9 to 98% for the polymer matrix swells up in high RH and shrinks in low RH, leading to a large reflectance shift (81 nm) and distinct color change. Based on the double-peak reflective spectra of the HPC film, we confirm the gradient swelling hypothesis and find that the thickness is another important factor for controlling the sensitivity and response rate of the HPC film. Except for static humidity, the HPC film can also respond to the dynamic humid flow of blowing and polar solvents, which broadens its application potential. This kind of HPC film shows a vivid structural color, and the humidityresponsive behavior is quick, distinct, energy-free, and reversible, having a great prospect for anticounterfeiting application.

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“…The stipulation for monitoring/controlling the ambient environment (temperature, atmospheric pressure and humidity) for balancing the microclimate surroundings in museums, organic farming, paper industry, sophisticated instruments, pharmaceuticals, electronics manufacturing, packaging, research laboratories, the medical industry, and standard/calibration labs has led to the development of novel and advanced sensing techniques. [1][2][3][4] Humidity is a widespread measured quantity that plays a very signicant role in diverse elds of applications from small-scale domestic applications to large-scale industrial processing. [5][6][7] It is a physical quantity which quanties the content of water vapour in the air or any other gases and is generally measured in terms of absolute humidity, dew point, and relative humidity.…”

Section: Introductionmentioning

confidence: 99%