A fast-response and highly linear humidity sensor based on quartz crystal microbalance

Zheng, Xinyu; Fan, Rongrong; Li, Chunru; Yang, Xingyue; Li, Huizi; Lin, Jian-Di; Zhou, Xuechou; Lv, Rixin

doi:10.1016/j.snb.2018.12.081

Cited by 43 publications

(15 citation statements)

References 25 publications

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“…This result is similar to most of previous QCM-based humidity sensors. 29 , 48 , 56 Brunauer–Emmett–Teller (BET) adsorption theory is usually used to explain this phenomenon. The adsorption of water molecules to the surface of the BiOCl film is multi-molecular layer adsorption.…”

Section: Resultsmentioning

confidence: 99%

Humidity-Sensing Properties of a BiOCl-Coated Quartz Crystal Microbalance

et al. 2020

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The performance of a bismuth oxychloride (BiOCl)-based quartz crystal microbalance (QCM) humidity sensor was studied using an oscillating circuit method. The BiOCl powder was prepared by a hydrolysis method. Scanning electron microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy were used to characterize the BiOCl sample. Its humidity-sensing property was analyzed by combining it with a QCM at room temperature (25 °C). Experimental results indicated that the BiOCl-based QCM sensor showed good humidity characteristics from 11.3 to 97.3%, such as good logarithmic frequency response to humidity levels ( R 2 = 0.994), fast response time (5.2 s)/recovery time (4.5 s), good reversibility, stability, repeatability, and low humidity hysteresis. In addition, the response to human nose breaths showed excellent practicability. Finally, the humidity sensing mechanism of the BiOCl-based QCM humidity sensor was discussed in detail. This work demonstrates that BiOCl is a promising candidate material for humidity detection.

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Section: Resultsmentioning

confidence: 99%

Humidity-Sensing Properties of a BiOCl-Coated Quartz Crystal Microbalance

et al. 2020

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“…Next to Cu-CeO2, Ni-CeO2(111) is another suitable catalyst, as the ceria support can modify the electronic properties of nickel by increasing its oxidation state [117,118]. It has also been reported for water-assisted methane activation by Lustemberg et al [119], who co-fed methane, O2, and water to obtain stable catalyst activity, as shown in Figure 11.…”

Section: From Methane Activation To Methanol Selectivitymentioning

confidence: 95%

“…Furthermore, ceria as support modifies the electronic properties of nickel by increasing its oxidation state. This modification can be typically important for applications such as electrical sensors, wherein no change in oxidation was reported with effect of temperature, aging, offset, and drift [117,118]. Strong metal-support interactions therefore play a crucial role in O-H and C-H bond dissociation.…”

Section: From Methane Activation To Methanol Selectivitymentioning

confidence: 99%

Approaches for Selective Oxidation of Methane to Methanol

et al. 2020

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Methane activation chemistry, despite being widely reported in literature, remains to date a subject of debate. The challenges in this reaction are not limited to methane activation but extend to stabilization of the intermediate species. The low C-H dissociation energy of intermediates vs. reactants leads to CO2 formation. For selective oxidation, nature presents methane monooxygenase as a benchmark. This enzyme selectively consumes methane by breaking it down into methanol. To assemble an active site similar to monooxygenase, the literature reports Cu-ZSM-5, Fe-ZSM-5, and Cu-MOR, using zeolites and systems like CeO2/Cu2O/Cu. However, the trade-off between methane activation and methanol selectivity remains a challenge. Density functional theory (DFT) calculations and spectroscopic studies indicate catalyst reducibility, oxygen mobility, and water as co-feed as primary factors that can assist in enabling higher selectivity. The use of chemical looping can further improve selectivity. However, in all systems, improvements in productivity per cycle are required in order to meet the economical/industrial standards.

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“…There are a lot of humidity sensors based on various physical principles (resistive [ 1 , 2 ], conductive [ 3 ], acoustic [ 4 , 5 ], capacitive [ 6 , 7 ], etc.). As for acoustic humidity sensors, there exists a large amount of papers, suggesting the use of film bulk acoustic resonators (FBARs) [ 8 , 9 ], various types of surface acoustic waves [ 4 , 5 , 8 , 9 , 10 , 11 ], quartz crystal microbalances (QCM) [ 8 , 12 ], and plate acoustic waves [ 13 ]. Most of the acoustic humidity sensors are based on the use of specific films deposited on the surface of acoustic waveguides [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

“…These, in turn, affect the acoustic wave phase velocity and/or attenuation or resonant frequency. Both organic and inorganic materials have been used as sensitive films [ 4 , 5 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 ]. One of the opportunities that is poorly studied is the use of films of the mycelia from higher fungi.…”

Section: Introductionmentioning

confidence: 99%

Influence of Humidity on the Acoustic Properties of Mushroom Mycelium Films Used as Sensitive Layers for Acoustic Humidity Sensors

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Krasnopolskaya

et al. 2020

Sensors

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The influence of humidity on the density, shear elastic module, viscosity, and thickness of the mushroom Pleurotus eryngii and Ganoderma lucidum mycelium films was studied. These data were obtained by comparing the theoretical and experimental frequency dependencies of the complex electrical impedance of bulk acoustic wave (BAW) resonator loaded by mycelium film using the least-squares method. This procedure was performed for the BAW resonator with pointed films for the relative humidity range of 17%–56% at the room temperature. As a result, the changes of the density, shear elastic module, viscosity, and thickness of the films under study, due to the water vapor adsorption, were determined. It has been established that the properties of mycelium films are restored after removing from the water vapor. So, these results show the possibility of using investigated mycelium films as sensitive layers for acoustic humidity sensors.

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A fast-response and highly linear humidity sensor based on quartz crystal microbalance

Cited by 43 publications

References 25 publications

Humidity-Sensing Properties of a BiOCl-Coated Quartz Crystal Microbalance

Humidity-Sensing Properties of a BiOCl-Coated Quartz Crystal Microbalance

Approaches for Selective Oxidation of Methane to Methanol

Influence of Humidity on the Acoustic Properties of Mushroom Mycelium Films Used as Sensitive Layers for Acoustic Humidity Sensors

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