Highly Sensitive Interdigitated Capacitive Humidity Sensors Based on Sponge-Like Nanoporous PVDF/LiCl Composite for Real-Time Monitoring

Ganbold, Enkhzaya; Kim, Eun Seong; Li, Yang; Yin, Feifei; Sharma, Parshant Kumar; Jeon, Jwa-Bin; Oh, Jong Min; Lee, Do Nam; Kim, Nam Young

doi:10.1021/acsami.2c20499

Cited by 30 publications

(24 citation statements)

References 51 publications

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“…To further explore the potential use of CuO in capacitive humidity sensors, it is crucial to consider the response and recovery times, which are key parameters of humidity sensing materials 29 . The response time is the period required for the sensor to reach 90% of the total change during moisture adsorption, while the recovery time is the duration needed to achieve 90% of the total change during moisture desorption.…”

Section: Resultsmentioning

confidence: 99%

“…These materials are renowned for their exceptional dielectric properties, which are significantly influenced by environmental humidity. This sensitivity to moisture makes them ideal candidates for use in humidity sensors, a critical component in various industrial, environmental, and biomedical applications 29 , 30 . The growing interest in these giant dielectric oxides for capacitive humidity sensing is driven by their potential to offer more sensitive, reliable, and durable sensors compared to their temperature and chemical stability.…”

Section: Introductionmentioning

confidence: 99%

“…One of the key parameters for employing giant dielectric oxides in humidity sensors is the hysteresis error (γ H ) 22 , 23 , 26 , 27 , 29 . This error arises from the difference between the forward and backward changes in the ε′ or capacitance (C p ) during the absorption and desorption of H 2 O molecules by giant dielectric oxides.…”

Section: Introductionmentioning

confidence: 99%

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Advanced humidity sensing properties of CuO ceramics

Sreejivungsa,

Thanamoon,

Phromviyo

et al. 2024

Sci Rep

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This research explores the capacitive humidity sensing properties of CuO ceramic, selected for its simplicity as an oxide and ease of fabrication, in addition to its remarkable dielectric properties. The CuO sample was fabricated by sintering at 980 °C for 5 h. A microstructure with a relative density of 88.9% was obtained. X-ray diffraction confirmed the formation of a pure CuO phase. Broadband dielectric spectroscopy revealed that the observed giant dielectric properties at room temperature (RT) were attributed to extrinsic effects, including the internal barrier layer capacitor and sample-electrode contact effects. A key focus of this study was to examine the giant dielectric properties of CuO ceramic as a function of relative humidity (RH) at RT and frequencies of 102 and 103 Hz. It was observed that the capacitance of CuO continuously increased with rising RH levels, ranging from 30 to 95%. Notably, the maximum hysteresis errors were constrained to 2.3 and 3.3% at 102 and 103 Hz, respectively. Additionally, the CuO ceramic demonstrated very fast response and recovery times, approximately 2.8 and 0.95 min, respectively. The repeatability of the humidity response of the capacitance was also established. Overall, this research highlights the high potential of CuO as a giant dielectric material for application in humidity sensors.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Advanced humidity sensing properties of CuO ceramics

Sreejivungsa,

Thanamoon,

Phromviyo

et al. 2024

Sci Rep

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show abstract

“…Meanwhile, the contact area between the water molecules and the micropores decreases. As a result, the actual contact surface of water molecules decreases and the capacitance value of the humidity sensitive layer increases [ 60 , 61 ] (Figure S13a , Supporting Information). The relationship between the humidity sensor output and the contact pressure can be fitted as C = 72.60 F + 2309.45.…”

Section: Resultsmentioning

confidence: 99%

Integrated Multifunctional Electronic Skins with Low‐Coupling for Complicated and Accurate Human–Robot Collaboration

et al. 2023

Advanced Science

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Multifunctional capability and low coupling electronic skin (e-skin) is of great significance in advanced robot systems interacting with the human body or the external environment directly. Herein, a multifunctional e-skin system via vertical integrated different sensing materials and structures is presented. The multifunctional e-skin has capacity sensing the proximity, pressure, temperature, and relative humidity simultaneously, with scope of 100-0 mm, 0-30 N, 20-120 °C and 20-70%, respectively. The sensitivity of the four kinds of sensors can be achieved to 0.72 mm −1 , 16.34 N −1 , 0.0032 °C−1 , and 15.2 pF/%RH, respectively. The cross-coupling errors are less than 1.96%, 1.08%, 2.65%, and 1.64%, respectively, after temperature compensation. To be state-of-the-art, a commercial robot is accurately controlled via the multifunctional e-skin system in the complicated environment. The following and safety controlling exhibit both accuracy and high dynamic features. To improve the sensing performance to the insulating objects, machine learning is employed to classify the conductivity during the object approaching, leading to set the threshold in dynamic. The accuracy for isolating the insulator increases from 18% to 88%. Looking forward, the multifunctional e-skin system has broader applications in human-machine collaboration and industrial safety production technology.

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“…Resistive and capacitive sensors are used to acquire data during plant growth [ 4 , 5 , 6 ]. Compared with resistive sensors, capacitive sensors have the advantages of fast corresponding speed, high sensitivity, and easy operation [ 7 , 8 ]. Moreover, in many cases, the resistance of plants varies weakly, which is not conducive to reflecting the change in the signal to be measured, thus limiting the application and expansion of resistance sensors in the field of plant monitoring.…”

Section: Introductionmentioning

confidence: 99%

In Situ Fabricated Liquid Metal Capacitors for Plant Sensing

et al. 2023

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Capacitive sensors are essential to promoting modernization and intelligence in agriculture. With the continuous advancement of this sensor technology, the demand for materials with high conductivity and flexibility is rapidly increasing. Herein, we introduce liquid metal as a solution for the in-site fabrication of high-performance capacitive sensors for plant sensing. As a comparison, three pathways have been proposed for the preparation of flexible capacitors inside plants, as well as on their surfaces. Specifically, concealed capacitors can be constructed by directly injecting liquid metal into the plant cavity. Printable capacitors are prepared via printing Cu-doped liquid metal with better adhesion on plant surfaces. A composite liquid metal-based capacitive sensor is achieved by printing liquid metal on the plant surface and injecting it into the interior of the plant. While each method has limitations, the composite liquid metal-based capacitive sensor provides an optimal trade-off between signal capture capability and operability. As a result, this composite capacitor is chosen as a sensor for monitoring water changes within plants and demonstrates the desired sensing performance, making it a promising technology for monitoring plant physiology.

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Highly Sensitive Interdigitated Capacitive Humidity Sensors Based on Sponge-Like Nanoporous PVDF/LiCl Composite for Real-Time Monitoring

Cited by 30 publications

References 51 publications

Advanced humidity sensing properties of CuO ceramics

Advanced humidity sensing properties of CuO ceramics

Integrated Multifunctional Electronic Skins with Low‐Coupling for Complicated and Accurate Human–Robot Collaboration

In Situ Fabricated Liquid Metal Capacitors for Plant Sensing

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