Hydrophobic ionic liquid-in-polymer composites for ultrafast, linear response and highly sensitive humidity sensing

Zhao, Xuanliang; Zhou, Kanglin; Zhong, Yanqiang; Liu, Peng; Li, Zechen; Pan, Jianwen; Long, Yu; Huang, Mei‐Rong; Brakat, Abdelrahman; Zhu, Hongwei

doi:10.1007/s12274-020-3172-3

Cited by 27 publications

(35 citation statements)

References 42 publications

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“…Moreover, a 1.5 times increase in tensile strength was observed with the polymer blend when compared to neat chitin. Zhao et al reported the design and development of a flexible humidity sensor employing the hydrophobic ionic liquid and hydrophobic polymer for applications in human respiratory monitoring and noncontact switches [27]. In this study, the humidity-sensitive polymer composite made up of poly (vinylidene fluoride-co-hexafluoropropylene) and (1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide, which exhibited linear response with good sensitivity.…”

Section: Ionic Liquid Assisted Approachmentioning

confidence: 95%

“…The design of the fibrous membrane-based humidity sensor displayed fast response and detected up to a 120 Hz humidity change because of its high surface area. Recently, the design of stronger chitin fibers as a polymer composite by blending chitin fibers and poly (lactic acid) using a wet-jet spinning method, in the presence of ionic liquid 1-ethyl-3-methylimidazolium acetate as a solvent, was developed [27]. Maximum plasticity and Young's modulus of the polymer blends was about 8.8% and ~6 GPa respectively.…”

Section: Ionic Liquid Assisted Approachmentioning

confidence: 99%

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Green Chemistry Approach for Fabrication of Polymer Composites

Joseph

Krishnan

Kavil

et al. 2021

Sustainable Chemistry

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Solvents are an inevitable part of industries. They are widely used in manufacturing and processing industries. Despite the numerous controlling measures taken, solvents contaminate our environment to a vast extent. Green and sustainable solvents have been a matter of growing interest within the research community over the past few years due to the increasing environmental concerns. Solvents are categorized as “green” based on their nonvolatility, nonflammability, availability, biodegradability and so on. The use of ionic liquids, super critical carbon dioxide and aqueous solvents for the fabrication of polymer composites is discussed in this review. The progress of utilizing solvent-free approaches for polymer composite preparation and efforts to produce new biobased solvents are also summarized.

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Section: Ionic Liquid Assisted Approachmentioning

confidence: 95%

Section: Ionic Liquid Assisted Approachmentioning

confidence: 99%

Green Chemistry Approach for Fabrication of Polymer Composites

Joseph

Krishnan

Kavil

et al. 2021

Sustainable Chemistry

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“…Generally, polymer composites consisting of liquid electrolytes are conceived as typical ionic conductors. The common liquid electrolytes mainly include aqueous electrolytes (such as KCl, KOH, and CoCl 2 ) and ionic liquids (such as 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([Emim][TFSI]) and 1-butyl-3-methylimidazolium tetrachloroferrate ([Bmim][FeCl 4 ]) [ 142 – 145 ]. As a kind of green solvent, ionic liquids show good solubility and miscibility with various organic and inorganic materials [ 146 ].…”

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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“…As there is a no standardized method to evaluate the response and recovery times of humidity sensors, measurements have been carried out using separate protocols for changing the humidity. For example, intermittent humid gas [ 54 , 65 , 70 , 110 , 132 ], humid gas controlled by a humidifier [ 133 , 134 , 135 ], or saturated salt solutions [ 52 , 136 , 137 ] have been used to supply variable humidity to the sensors. Changes between lower humidity levels influence response and recovery times because the amount of adsorbed water molecules may affect the time for adsorption and desorption.…”

Section: Response and Recovery Of Reported Fast-response Humidity Sen...mentioning

confidence: 99%

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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Hydrophobic ionic liquid-in-polymer composites for ultrafast, linear response and highly sensitive humidity sensing

Cited by 27 publications

References 42 publications

Green Chemistry Approach for Fabrication of Polymer Composites

Green Chemistry Approach for Fabrication of Polymer Composites

Multifunctional Flexible Humidity Sensor Systems Towards Noncontact Wearable Electronics

Respiratory Monitoring by Ultrafast Humidity Sensors with Nanomaterials: A Review

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