Recent advances in humidity sensors for human body related humidity detection

Duan, Zaihua; Jiang, Yadong; Tai, Huiling

doi:10.1039/d1tc04180k

Cited by 186 publications

(99 citation statements)

References 143 publications

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“…Various materials, such as two-dimensional (2D) materials [11,12], polyelectrolytes [13] and metal oxides [14], have been researched. Among them, 2D GO materials have attracted much attention because of their many features, such as a high specific surface area, a high mechanical modulus, easy stacking, easy functionalization and luxuriant oxygen-containing functional groups [15][16][17][18]. However, previous studies [19] found that the interlayer spacing of GOMs is 12.8 ± 0.2 Å, even when completely immersed in water.…”

Section: Introductionmentioning

confidence: 99%

Quartz Crystal Microbalance Humidity Sensors Based on Structured Graphene Oxide Membranes with Magnesium Ions: Design, Mechanism and Performance

Peng

Zhao

et al. 2022

Membranes

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The application of graphene oxide (GO)-based membranes combined with a quartz crystal microbalance (QCM) as a humidity sensor has attracted great interest over the past few years. Understanding the influence of the structure of the GO membrane (GOM) on the adsorption/desorption of water molecules and the transport mechanism of water molecules in the membrane is crucial for development of applications using GOM-based humidity sensors. In this paper, by investigating the effects of oxygen-containing groups, flake size and interlayer spacing on the performance of humidity sensing, it was found that humidity-sensing performance could be improved by rational membrane-structure design and the introduction of magnesium ions, which can expand the interlayer spacing. Therefore, a novel HGO&GO&Mg2+ structure prepared by uniformly doping magnesium ions into GO&HGO thin composite membranes was designed for humidity sensing from 11.3% RH to 97.3% RH. The corresponding sensor exhibits a greatly improved humidity sensitivity (~34.3 Hz/%RH) compared with the original pure GO-based QCM sensor (~4.0 Hz/%RH). In addition, the sensor exhibits rapid response/recovery times (7 s/6 s), low hysteresis (~3.2%), excellent repeatability and good stability. This research is conducive to understanding the mechanism of GOM-based humidity sensors. Owing to its good humidity-sensing properties, the HGO&GO&Mg2+ membrane-based QCM humidity sensor is a good candidate for humidity sensing.

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Section: Introductionmentioning

confidence: 99%

Quartz Crystal Microbalance Humidity Sensors Based on Structured Graphene Oxide Membranes with Magnesium Ions: Design, Mechanism and Performance

Peng

Zhao

et al. 2022

Membranes

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“…In addition to monitoring human respiration, fast-response humidity sensors can be used to monitor human physiological behaviors, as shown in this section [ 164 ]. Duan et al summarized recent advancements in humidity sensors for human-body-related observations [ 17 ]. The recognition of verbal words has been reported from breath air [ 54 , 104 , 111 , 135 , 165 ].…”

Section: Other Application For Physiological Monitoringmentioning

confidence: 99%

“…Humidity is also a valuable observable for contact-based health monitoring. Humidity sensors with ultrafast response and recovery times have been recently proposed in the field of materials science [ 16 , 17 ]. Functional nanomaterials play an important role in speeding up the response and recovery rates of the sensors.…”

Section: Introductionmentioning

confidence: 99%

“…As the human breath has a high humidity content, ultrafast humidity sensors have the potential to follow respiration patterns in real time and provide vital health information. Various demonstrations of respiratory monitoring in subjects using humidity have been reported [ 17 ]. In this review, we overview recent developments on ultrafast humidity sensors using functional nanomaterials for respiratory monitoring.…”

Section: Introductionmentioning

confidence: 99%

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Respiratory Monitoring by Ultrafast Humidity Sensors with Nanomaterials: A Review

Kano

Jarulertwathana

Mohd-Noor

et al. 2022

Sensors

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Respiratory monitoring is a fundamental method to understand the physiological and psychological relationships between respiration and the human body. In this review, we overview recent developments on ultrafast humidity sensors with functional nanomaterials for monitoring human respiration. Key advances in design and materials have resulted in humidity sensors with response and recovery times reaching 8 ms. In addition, these sensors are particularly beneficial for respiratory monitoring by being portable and noninvasive. We systematically classify the reported sensors according to four types of output signals: impedance, light, frequency, and voltage. Design strategies for preparing ultrafast humidity sensors using nanomaterials are discussed with regard to physical parameters such as the nanomaterial film thickness, porosity, and hydrophilicity. We also summarize other applications that require ultrafast humidity sensors for physiological studies. This review provides key guidelines and directions for preparing and applying such sensors in practical applications.

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“…Therefore, it is necessary to summarize the research results emerged in the past decade to follow the rapid development of hierarchical metal oxide-based sensing materials, and find the rules to design and synthesize metal oxides with higher sensing performance. In addition, several excellent reviews on gas sensing mechanism, [32] the detection of various gases, [33][34][35] the sensing materials with different dimensions, [36][37][38] gas sensors based on heterojunction, [39,40] semiconductors metal oxides based gas sensors, [41][42][43] and the applications of gas sensors [44][45][46] may further help to understand the present state of metal oxide-based gas sensors from different perspective. However, few of them focus on the diversity of the application environment of the gas sensors.…”

mentioning

confidence: 99%

Recent Development of Hierarchical Metal Oxides Based Gas Sensors: From Gas Sensing Performance to Applications

Hou

Guo

Zhang

et al. 2022

Advanced Sustainable Systems

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applied in various fields including mining, aviation, medical diagnostics, food safety, automobile industry, indoor air quality monitoring, and environmental pollution control, etc. [1][2][3][4][5][6][7] Among them, due to the close relationship with human health, the applications of gas sensors in indoor air quality monitoring, breath analysis, and food safety have received wide attentions. [8][9][10] Conventionally, several

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Recent advances in humidity sensors for human body related humidity detection

Abstract: For a long time, humidity sensors have been mainly used in detecting humidity of ambient conditions, such as, industry, agriculture, and smart home. With the development of wearable electronic systems,...

Cited by 186 publications

References 143 publications

Quartz Crystal Microbalance Humidity Sensors Based on Structured Graphene Oxide Membranes with Magnesium Ions: Design, Mechanism and Performance

Quartz Crystal Microbalance Humidity Sensors Based on Structured Graphene Oxide Membranes with Magnesium Ions: Design, Mechanism and Performance

Respiratory Monitoring by Ultrafast Humidity Sensors with Nanomaterials: A Review

Recent Development of Hierarchical Metal Oxides Based Gas Sensors: From Gas Sensing Performance to Applications

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