Highly stable Pd/HNb<sub>3</sub>O<sub>8</sub>-based flexible humidity sensor for perdurable wireless wearable applications

Lu, Yiji; Xu, Kaichen; Yang, Min‐Quan; Tang, Shin-Yi; Yang, Tzu‐Yi; Fujita, Yusuke; Honda, Satoko; Arie, Takayuki; Akita, Seiji; Chueh, Yu‐Lun; Takei, Kuniharu

doi:10.1039/d0nh00594k

Cited by 46 publications

(40 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Nowadays, flexible, wearable electronic devices with superior sensing properties that can monitor the human body’s physical health, walking movement, state changes, etc., play a significant role in the field of smart products in our daily lives [ 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 ]. Additionally, it is important to prepare flexible composites with both excellent EMI shielding and sensing properties.…”

Section: Introductionmentioning

confidence: 99%

Constructing a Segregated Magnetic Graphene Network in Rubber Composites for Integrating Electromagnetic Interference Shielding Stability and Multi-Sensing Performance

et al. 2021

View full text Add to dashboard Cite

A flexible, wearable electronic device composed of magnetic iron oxide (Fe3O4)/reduced graphene oxide/natural rubber (MGNR) composites with a segregated network was prepared by electrostatic self-assembly, latex mixing, and in situ reduction. The segregated network offers the composites higher electrical conductivity and more reliable sensing properties. Moreover, the addi-tion of Fe3O4 provides the composites with better electromagnetic interference shielding effectiveness (EMI SE). The EMI shielding property of MGNR composites is more stable under tensile deformation and long-term cycling conditions and has a higher sensitivity to stretch strain compared with the same structure made from reduced graphene oxide/natural rubber (GNR) composites. The EMI SE value of MGNR composites reduces by no more than 2.9% under different tensile permanent deformation, cyclic stretching, and cyclic bending conditions, while that of GNR composites reduces by approximately 16% in the worst case. Additionally, the MGNR composites have a better sensing performance and can maintain stable signals, even in the case of cyclic stretching with a very small strain (0.05%). Furthermore, they can steadily monitor the changes in resistance signals in various human motions such as finger bending, wrist bending, speaking, smiling, and blinking, indicating that the MGNR composites can be used in future wearable electronic flexibility devices.

show abstract

Section: Introductionmentioning

confidence: 99%

Constructing a Segregated Magnetic Graphene Network in Rubber Composites for Integrating Electromagnetic Interference Shielding Stability and Multi-Sensing Performance

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The real‐time study on finger‐skin moisture at different physical states was conducted by attaching the proposed integrated flexible sensor system, which included temperature and humidity sensors, on the fingers or in wearable gloves ( Figure a,b). [ 27,28 ] Skin, which is endowed with complex sensory systems, not only acts as the first line of defense from external factors but also plays a major role in mechanical contact, somatic perception, and nutrient exchange with the external environment (Figure 1c). [ 2 ]…”

Section: Resultsmentioning

confidence: 99%

Wireless and Flexible Skin Moisture and Temperature Sensor Sheets toward the Study of Thermoregulator Center

Fujita

Honda

et al. 2021

Adv Healthcare Materials

Self Cite

View full text Add to dashboard Cite

A disorder in the thermoregulator center in a human body leads to some potential diseases such as fever and hyperthyroidism. To predict these diseases early, monitoring the health condition of the human body due to the influence of thermoregulation disorders is important. Although extensive works are performed on sweat‐rate detection by constructing microfluidic channels, skin‐moisture evaporation before sweating remains unknown. This work proposes a wireless and flexible sensor sheet to investigate the thermoregulatory responses of different people under cold stimulation and exercise by measuring the temperature and moisture variations on the finger skin. An integrated flexible sensor system consists of a ZnIn2S4 nanosheet‐based humidity sensor and carbon nanotube/SnO2 temperature sensor. The results exhibit distinct thermoregulation abilities of five volunteers. Interestingly, the sudden increase in finger moisture that results from the excitation by the sympathetic nerve is observed during the cold‐stimulus test. Although further studies are required to predict the potential diseases resulted from thermoregulation disorders in human body, this study provides a possibility of continuous and real‐time monitoring of thermoregulatory activities via skin moisture and temperature detection using a flexible sensor sheet.

show abstract

“…As well as sweat secreted from sweat glands, water vaporization through the skin is a major source of water loss (transepidermal water loss (TEWL)) [ 166 ]. Several groups have recently demonstrated the detection of water vapor from the fingertip without contact [ 52 , 57 , 58 , 96 , 101 , 165 , 168 , 169 , 170 ]. The intensity of the sensor output is dependent on the height of the fingertip from the sensor surface.…”

Section: Other Application For Physiological Monitoringmentioning

confidence: 99%

Respiratory Monitoring by Ultrafast Humidity Sensors with Nanomaterials: A Review

Kano

Jarulertwathana

Mohd-Noor

et al. 2022

Sensors

View full text Add to dashboard Cite

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.

show abstract

Highly stable Pd/HNb₃O₈-based flexible humidity sensor for perdurable wireless wearable applications

Abstract: A Pd/HNb3O8 flexible humidity sensor is developed with long-term stability at a high humidity level (∼90% RH). Using the sensor, wireless monitoring of human respirations and finger moisture variation under exercise is successfully demonstrated.

Cited by 46 publications

References 48 publications

Constructing a Segregated Magnetic Graphene Network in Rubber Composites for Integrating Electromagnetic Interference Shielding Stability and Multi-Sensing Performance

Constructing a Segregated Magnetic Graphene Network in Rubber Composites for Integrating Electromagnetic Interference Shielding Stability and Multi-Sensing Performance

Wireless and Flexible Skin Moisture and Temperature Sensor Sheets toward the Study of Thermoregulator Center

Respiratory Monitoring by Ultrafast Humidity Sensors with Nanomaterials: A Review

Contact Info

Product

Resources

About

Highly stable Pd/HNb3O8-based flexible humidity sensor for perdurable wireless wearable applications

Abstract: A Pd/HNb3O8 flexible humidity sensor is developed with long-term stability at a high humidity level (∼90% RH). Using the sensor, wireless monitoring of human respirations and finger moisture variation under exercise is successfully demonstrated.

Cited by 46 publications

References 48 publications

Constructing a Segregated Magnetic Graphene Network in Rubber Composites for Integrating Electromagnetic Interference Shielding Stability and Multi-Sensing Performance

Constructing a Segregated Magnetic Graphene Network in Rubber Composites for Integrating Electromagnetic Interference Shielding Stability and Multi-Sensing Performance

Wireless and Flexible Skin Moisture and Temperature Sensor Sheets toward the Study of Thermoregulator Center

Respiratory Monitoring by Ultrafast Humidity Sensors with Nanomaterials: A Review

Contact Info

Product

Resources

About

Highly stable Pd/HNb₃O₈-based flexible humidity sensor for perdurable wireless wearable applications