An ultrafast QCM humidity sensor for respiratory monitoring outside a mask

Zhao, Xuan; Chen, Xiangdong; Liu, Fang; Ding, Xing; Yu, Xiang; Tang, Kun; Li, Guoping

doi:10.1016/j.snb.2022.132396

Cited by 21 publications

(8 citation statements)

References 25 publications

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“…There are many types of humidity sensors, mainly including capacitive, 5,6 impedance, 7 current, 8 microwave, 9,10 quartz crystal microbalance (QCM), 11,12 surface acoustic wave (SAW), 13 and optical. 14−16 Among them, optical sensors are very attractive due to strong antielectromagnetic interference, fast response time, simple preparation process, and low price.…”

Section: Introductionmentioning

confidence: 99%

“…There are many types of humidity sensors, mainly including capacitive, , impedance, current, microwave, , quartz crystal microbalance (QCM), , surface acoustic wave (SAW), and optical. − Among them, optical sensors are very attractive due to strong antielectromagnetic interference, fast response time, simple preparation process, and low price. The Fabry–Pérot (F–P) cavity is an interference-type optical structure, which is widely used in the field of sensing due to its ability to reflect multiple times and limit the electromagnetic field to a small volume. , The humidity sensing performance of the F–P cavity mainly relies on the moisture sensing material constructed of the cavity.…”

Section: Introductionmentioning

confidence: 99%

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Fabry–Pérot Cavity Based on Metal–Organic Framework/Graphene Oxide Heterostructure Membranes for Humidity Sensing

Zhang,

Chen,

Tian

et al. 2024

ACS Appl. Nano Mater.

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This paper reports a Fabry−Peŕot (F−P) cavity constructed of heterostructure membranes by metal−organic framework 801 (MOF-801) and graphene oxide (GO) that can achieve highperformance relative humidity (RH) sensing. The reflectance spectrum of the cavity is tuned by adjusting the concentration of MOF-801, spin coating period, and spin coating speed to achieve the optimal reflection waveform. The humidity sensing performance of the MOF-801 membrane and MOF-801/GO heterostructure membrane F−P cavities were investigated systematically. MOF-801/GO heterostructure membranes show higher humidity sensitivity (0.32 nm/% RH) and lower detection limit (0.31% RH) comparing with MOF-801 membranes because the multifunctional reactive groups of GO can interact with H 2 O, which enhances adsorption of H 2 O. The MOF-801/GO heterostructure membrane F−P cavity shows a fast optical response (400 ms), with a maximum response value of 27.9 nm (Δλ) at 90% RH. Moreover, the MOF-801/GO heterostructure membrane cavity exhibits excellent selectivity for H 2 O vapor among four interfering gases of CO 2 , N 2 , He, and Ar. Meanwhile, the cavity keeps exceptional repeatability and reliability at different RH values. The sensitivity of the MOF-801/GO heterostructure membrane F−P cavity under mouth breathing is excellent, indicating the cavity is a promising candidate for human respiratory monitoring. The F−P cavity based on MOF-801/GO heterostructure membranes provides a path to fabricate high-performance real-time monitoring of humidity sensors.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fabry–Pérot Cavity Based on Metal–Organic Framework/Graphene Oxide Heterostructure Membranes for Humidity Sensing

Zhang,

Chen,

Tian

et al. 2024

ACS Appl. Nano Mater.

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“…Layer modification by adding active ingredients to the QCM surface was conducted to improve the sensitivity and selectivity of QCM. Several active layer QCM-based sensor devices include TiO2/Ag composites as humidity sensors [1,2], phthalocyanine as benzene, toluene, and xylene (BTX) sensors [3], PANI/NiO as gelatine detectors [4], and graphene as gas sensors [5]. Due to the characteristics of quartz crystals, microbalance has received increasing attention in this field.…”

Section: Introductionmentioning

confidence: 99%

Implications of the Electrodeposition Scan Rate on the Morphology of Polyaniline Layer and the Impedance of a QCM Sensor

et al. 2023

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This work aims to determine how the scan rate affects PANI layers' morphology and resonance parameters deposited on quartz crystal microbalance (QCM). The PANI layer was produced using the electrodeposition method with a scan rate variation of 10 to 50 mV/s. The PANI layer deposited at a scan rate of 10 mV/s has an aggregate morphology, whereas the morphology becomes more scattered at a higher scan rate. On the other hand, the homogeneity of the distribution of PANI particles increases due to the increase in the scan rate. The QCM impedance profile also changes with PANI layer deposition at different scan rates. The QCM impedance profile with the PANI layer that is most similar to the uncoated QCM impedance profile is at a scan rate of 10, 40 and 50 mV/s. The resonance parameters, which represent the inertial mass and the dissipative characteristics of the PANI layer, were investigated. The PANI layer with the smallest resonance parameter has a scan rate of 10 and 40 mV/s. Therefore, the 2 scan rates are the best candidates to be applied further. HIGHLIGHTS The electrodeposition scan rate influences the morphology of the PANI layer deposited above QCM The amount of carbon distributed across the QCM surface represents how effective the PANI deposition was The resulting morphology will impact the PANI layer's impedance characteristic and resonance parameter values GRAPHICAL ABSTRACT

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“…In recent years, MOF−based humidity sensors have received more and more attention [ 44 ]. The main mechanism of MOF gas sensors is based on the interaction between MOFs and the target gas [ 45 ], while the main point of humidity sensors is the adsorption of water molecules [ 46 , 47 ]. There are many reviews on MOF−based gas sensors [ 48 , 49 ], although none of them focus on the application of MOFs in humidity sensors.…”

Section: Introductionmentioning

confidence: 99%

Humidity Sensors Based on Metal–Organic Frameworks

Teng

Zhang

2022

Nanomaterials

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Humidity sensors are important in industrial fields and human activities. Metal−organic frameworks (MOFs) and their derivatives are a class of promising humidity−sensing materials with the characteristics of a large specific surface area, high porosity, modifiable frameworks, and high stability. The drawbacks of MOFs, such as poor film formation, low electrical conductivity, and limited hydrophilicity, have been gradually overcome with the development of material science. Currently, it is moving towards a critical development stage of MOF−based humidity sensors from usability to ease of use, of which great challenges remain unsolved. In order to better understand the related challenges and point out the direction for the future development of MOF−based humidity sensors, we reviewed the development of such sensors based on related published work, focusing on six primary types (impedance, capacitive, resistive, fluorescent, quartz crystal microbalance (QCM), and others) and analyzed the sensing mechanism, material design, and sensing performance involved, and presented our thoughts on the possible future research directions.

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An ultrafast QCM humidity sensor for respiratory monitoring outside a mask

Cited by 21 publications

References 25 publications

Fabry–Pérot Cavity Based on Metal–Organic Framework/Graphene Oxide Heterostructure Membranes for Humidity Sensing

Fabry–Pérot Cavity Based on Metal–Organic Framework/Graphene Oxide Heterostructure Membranes for Humidity Sensing

Implications of the Electrodeposition Scan Rate on the Morphology of Polyaniline Layer and the Impedance of a QCM Sensor

Humidity Sensors Based on Metal–Organic Frameworks

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