All-cellulose-derived humidity sensor prepared <i>via</i> direct laser writing of conductive and moisture-stable electrodes on TEMPO-oxidized cellulose paper

Zhu, Luting; Li, Xiang; Kasuga, Takaaki; Uetani, Koji; Nogi, Masaya; Koga, Hirotaka

doi:10.1039/d1tc05339f

Cited by 26 publications

(25 citation statements)

References 38 publications

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“…The overall performance of the hydrogel film-based humidity sensor is superior to that of existing flexible humidity sensor based on other transducing materials, such as rGO/GO/rGO, SWCNT/PVA and PDMS-CaCl 2 (Table 1 , Fig. 6 i) [ 30 – 34 , 65 , 66 ]. Among them, the range of RH variation used for the calculation of response/recovery time is different in different articles.…”

Section: Resultsmentioning

confidence: 97%

Humidity Sensing of Stretchable and Transparent Hydrogel Films for Wireless Respiration Monitoring

et al. 2022

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Respiratory monitoring plays a pivotal role in health assessment and provides an important application prospect for flexible humidity sensors. However, traditional humidity sensors suffer from a trade-off between deformability, sensitivity, and transparency, and thus the development of high-performance, stretchable, and low-cost humidity sensors is urgently needed as wearable electronics. Here, ultrasensitive, highly deformable, and transparent humidity sensors are fabricated based on cost-effective polyacrylamide-based double network hydrogels. Concomitantly, a general method for preparing hydrogel films with controllable thickness is proposed to boost the sensitivity of hydrogel-based sensors due to the extensively increased specific surface area, which can be applied to different polymer networks and facilitate the development of flexible integrated electronics. In addition, sustainable tapioca rich in hydrophilic polar groups is introduced for the first time as a second cross-linked network, exhibiting excellent water adsorption capacity. Through the synergistic optimization of structure and composition, the obtained hydrogel film exhibits an ultrahigh sensitivity of 13,462.1%/%RH, which is unprecedented. Moreover, the hydrogel film-based sensor exhibits excellent repeatability and the ability to work normally under stretching with even enhanced sensitivity. As a proof of concept, we integrate the stretchable sensor with a specially designed wireless circuit and mask to fabricate a wireless respiratory interruption detection system with Bluetooth transmission, enabling real-time monitoring of human health status. This work provides a general strategy to construct high-performance, stretchable, and miniaturized hydrogel-based sensors as next-generation wearable devices for real-time monitoring of various physiological signals.

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Section: Resultsmentioning

confidence: 97%

Humidity Sensing of Stretchable and Transparent Hydrogel Films for Wireless Respiration Monitoring

et al. 2022

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“…Devices from two distinct sensing rections, wearables and disposables, however, have led to material advances that c help meet the requirements of wound sensors. Some of these are highlighted in Tab and typically fall within the polymeric (PET, PI, PDMS) and cellulosic paper domain A common design approach is to deposit a pair of interdigitated electrodes on target substrate through either printing silver (screen or inkjet), evaporation of Ti/Au ers [41,42] or through the laser scribing of carbon tracks directly within the material A common design approach is to deposit a pair of interdigitated electrodes on the target substrate through either printing silver (screen or inkjet), evaporation of Ti/Au layers [41,42] or through the laser scribing of carbon tracks directly within the material [43][44][45], as indicated in Figure 2A. In some instances, the base substrate can facilitate ionic conduction between the electrodes upon interaction/adsorption of water and may be sufficient to enable the acquisition of a quantifiable signal and is common in the case of those employing cellulosic fibres [41][42][43][44].…”

Section: Design Requirements and Sensing Methodologiesmentioning

confidence: 99%

“…The adsorption of moisture can also markedly change the dielectric properties of the sensing layer, with the resulting change in capacitance facilitating another detection option. employing cellulosic fibres [41][42][43][44]. The more common approach relies upon the deposition of a second, moisture-sensitive layer via drop casting, spraying, etc.…”

Section: Design Requirements and Sensing Methodologiesmentioning

confidence: 99%

Developing Wound Moisture Sensors: Opportunities and Challenges for Laser-Induced Graphene-Based Materials

et al. 2022

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Recent advances in polymer composites have led to new, multifunctional wound dressings that can greatly improve healing processes, but assessing the moisture status of the underlying wound site still requires frequent visual inspection. Moisture is a key mediator in tissue regeneration and it has long been recognised that there is an opportunity for smart systems to provide quantitative information such that dressing selection can be optimised and nursing time prioritised. Composite technologies have a rich history in the development of moisture/humidity sensors but the challenges presented within the clinical context have been considerable. This review aims to train a spotlight on existing barriers and highlight how laser-induced graphene could lead to emerging material design strategies that could allow clinically acceptable systems to emerge.

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“…Owing to the intrinsic hydrophilic property, a variety of natural biomaterials, such as cellulose and proteins, are found with excellent humidity performance including high humidity response, outstanding flexibility and remarkable noncontact sensation [ 40 , 54 , 124 , 125 ]. A promising path to achieving highly responsive humidity sensors is to utilize or mimic the natural products.…”

Section: Various Functional Materials For Flexible Humidity Sensorsmentioning

confidence: 99%

Multifunctional Flexible Humidity Sensor Systems Towards Noncontact Wearable Electronics

et al. 2022

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In the past decade, the global industry and research attentions on intelligent skin-like electronics have boosted their applications in diverse fields including human healthcare, Internet of Things, human–machine interfaces, artificial intelligence and soft robotics. Among them, flexible humidity sensors play a vital role in noncontact measurements relying on the unique property of rapid response to humidity change. This work presents an overview of recent advances in flexible humidity sensors using various active functional materials for contactless monitoring. Four categories of humidity sensors are highlighted based on resistive, capacitive, impedance-type and voltage-type working mechanisms. Furthermore, typical strategies including chemical doping, structural design and Joule heating are introduced to enhance the performance of humidity sensors. Drawing on the noncontact perception capability, human/plant healthcare management, human–machine interactions as well as integrated humidity sensor-based feedback systems are presented. The burgeoning innovations in this research field will benefit human society, especially during the COVID-19 epidemic, where cross-infection should be averted and contactless sensation is highly desired.

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All-cellulose-derived humidity sensor prepared via direct laser writing of conductive and moisture-stable electrodes on TEMPO-oxidized cellulose paper

Abstract: Abundant and renewable all-cellulose-derived humidity sensors are fabricated via direct laser writing of patterned electrodes onto TEMPO-oxidized cellulose fiber paper, offering versatile applicability for the “trillion sensor” era.

Cited by 26 publications

References 38 publications

Humidity Sensing of Stretchable and Transparent Hydrogel Films for Wireless Respiration Monitoring

Humidity Sensing of Stretchable and Transparent Hydrogel Films for Wireless Respiration Monitoring

Developing Wound Moisture Sensors: Opportunities and Challenges for Laser-Induced Graphene-Based Materials

Multifunctional Flexible Humidity Sensor Systems Towards Noncontact Wearable Electronics

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