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Self-Healing,Self-Adhesive and Stable organohydrogel-Based Stretchable Oxygen Sensor with High Performance at Room Temperature

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Nano-Micro Letters 2022年第3期14卷 257-275页

作者： Yuning Liang Zixuan Wu Yaoming Wei Qiongling Ding Meital Zilberman Kai Tao Xi Xie Jin Wu State Key Laboratory of Optoelectronic Materials and Technologies and the Guangdong Province Key Laboratory of Display Material and Technology School of Electronics and Information TechnologySun Yat-Sen UniversityGuangzhou 510275People’s Republic of China Department of Biomedical Engineering Faculty of EngineeringTel Aviv University69978 Tel AvivIsrael Ministry of Education Key Laboratory of Micro and Nano Systems for Aerospace Northwestern Polytechnical UniversityXi’an 710072People’s Republic of China

With the advent of the 5G era and the rise of the Internet of Things,various sensors have received unprecedented attention,especially wearable and stretchable sensors in the healthcare field.Here,a stretchable,self-healable,self-adhesive,and room-temperature oxygen sensor with excellent repeatability,a full concentration detection range(0-100%),low theoretical limit of detection(5.7 ppm),high sensitivity(0.2%/ppm),good linearity,excellent temperature,and humidity tolerances is fabricated by using polyacrylamide-chitosan(PAM-CS)double network(DN)organohydrogel as a novel transducing material.The PAM-CS DN organohydrogel is transformed from the PAM-CS composite hydrogel using a facile soaking and solvent replacement strategy.Compared with the pristine hydrogel,the DN organohydrogel displays greatly enhanced mechanical strength,moisture retention,freezing resistance,and sensitivity to oxygen.Notably,applying the tensile strain improves both the sensitivity and response speed of the organohydrogel-based oxygen sensor.Furthermore,the response to the same concentration of oxygen before and after self-healing is basically the same.Importantly,we propose an electrochemical reaction mechanism to explain the positive current shift of the oxygen sensor and corroborate this sensing mechanism through rationally designed experiments.The organohydrogel oxygen sensor is used to monitor human respiration in real-time,verifying the feasibility of its practical application.This work provides ideas for fabricating more stretchable,self-healable,self-adhesive,and high-performance gas sensors using ion-conducting organohydrogels.

关键词： Stretchable oxygen sensors organohydrogel Self-healing Self-adhesive Electrochemical reaction

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A flexible organohydrogel-based humidity sensor for noncontact artificial sensation

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Science China(Technological Sciences) 2022年第1期65卷 191-200页

作者： ZHANG Yu LI Chen YANG Han ZHAO Rui CHEN XinJian NIE BaoQing HU Liang Medical Image Processing Analysis and Visualization(MIPAV)School of Electronic and Information EngineeringSoochow UniversitySuzhou 215000China State Key Laboratory of Radiation Medicine and Protection School for Radiological and Interdisciplinary Sciences(RAD-X)and Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education InstitutionsSoochow UniversitySuzhou 215000China

In this paper,we propose a simple organohydrogel based capacitive humidity sensor for noncontact artificial sensation applications.The sensor is simple in design and consists of a transparent polyacrylamide organohydrogel thin film attached on a flexible inter-digit electrode layer.The process of water absorption and desorption is reversible,thus the dielectric of the organohydrogel film as well as the overall capacitance is dependent on environmental humidity.The water absorption capacity and structural reliability of the device have been largely improved by adding glycerol in the organohydrogel network.By optimizing both the glycerol concentration and organohydrogel film thickness,the sensor can respond to cyclic humidity changes in a period of 300 ms.In addition,this sensor achieves a high relative capacitance increase(by 20 folds)in a wide relative humidity range(12%-95%).The sensor also exhibits high stability under different bending curvatures(up to 6.81 mm),wide temperature changes(20℃-40℃)and external pressures(0-8 N).To demonstrate the applications in wearable electronics,we found that the sensor was successful in detecting respiration intensity and rate as well as the difference in moisture content in various objects,i.e.,human skin and leaf surface.This sensor is highly sensitive and can be useful in the detection of the widerange of humidity changes.

关键词： humidity sensor organohydrogel wearable electronics

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Wide temperature range-and damage-tolerant microsupercapacitors from salt-tolerant, anti-freezing and self-healing organohydrogel via dynamic bonds modulation

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Journal of Energy Chemistry 2023年第3期78卷 283-293,I0009页

作者： Cheng Tang Manni Li Yaling Wang Yan Zhang Yinzhuo Yao Guolong Wang Jiamei Liu Lei Li State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049ShaanxiChina State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong UniversityXi’an 710049ShaanxiChina Instrument Analysis Center of Xi’an Jiaotong University Xi’an Jiaotong UniversityXi’an 710049ShaanxiChina

The advance of microelectronics requires the micropower of microsupercapacitors(MSCs) to possess wide temperature-and damage-tolerance beyond high areal energy density.The properties of electrolyte are crucial for MSCs to meet the above requirements.Here,an organohydrogel electrolyte,featured with high salt tolerance,ultralow freezing point,and strong self-healing ability,is experimentally realized via modulating its inner dynamic bonds.Spectroscopic and theoretical analysis reveal that dimethyl sulfoxide has the ability to reconstruct Li^(+)solvation structure,and interact with free water and polyvinyl alcohol chains via forming hydrogen bonds.The organohydrogel electrolyte is employed to build MSCs,which show a boosted energy density,promising wide temperature range-and damage-tolerant ability.These attractive features make the designed organohydrogel electrolyte have great potential to advance MSCs.

关键词： Microsupercapacitor organohydrogel Salt tolerance Anti-freezing Self-healing

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Oil-polluted water purification via the carbon-nanotubes-doped organohydrogel platform

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Nano Research 2022年第6期15卷 5653-5662页

作者： Xuetao Xu Xizi Wan Haonan Li Yikai Zhang Wen He Shuli Wang Miao Wang Xu Hou Shutao Wang CAS Key Laboratory of Bio-inspired Materials and Interfacial Science Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China College of Chemistry and Chemical Engineering Xiamen UniversityXiamen 361005China College of Materials Xiamen UniversityXiamen 361005China College of Physical Science and Technology Xiamen UniversityXiamen 361005China University of Chinese Academy of Sciences Beijing 100049China

Solar-driven evaporators are promising for tackling freshwater scarcity but still challenged in simultaneously realizing comprehensive performances at one platform for sustainable and efficient application in real-world environments,such as stablefloating,scalability,salt-resistance,efficient vaporization,and anti-oil-fouling property.Herein,we design a hybrid organohydrogel evaporator to achieve the enduring oil contamination repulsion with maintaining accelerated evaporation process,and integrate capacities of ultra-stable floating,hindered salt-crystallization,large-scale fabrication for practical purification of seawater and polluted solutions.The raised water surface surrounding evaporators,induced by low density of organogel-phase,results in oil contamination resistance through the lateral capillary repulsion effect.Meanwhile,the organogel-phase containing photo-thermal carbon-nanotubes with low thermal capacity and conduction can form locally confined hot dots under solar irradiation and reduce heat dissipation on heating excessive water.Therefore,based on this approach,accelerated long-term practical purification of oilcontaminated solutions without any extra disposal is realized.Considering other properties of ultra-stable floating,large-scale fabrication,and anti-salt crystallization,these innovative organohydrogel evaporators open pathways for purifying oil-slickpolluted water via interfacial evaporation and are anticipated accelerating industrialization of efficient and sustainable solar-driven water purification.

关键词： solar-driven evaporation organohydrogel anti-oil-fouling thermal management ultra-stable floating

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An injectable curcumin-releasing organohydrogel with non-drying property and high mechanical stability at low-temperature for expe dite d skin wound care

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Journal of Materials Science & Technology 2023年第2期133卷 123-134页

作者： Kang Wu Qiang Yang Lin Zhang Pengcheng Xu Xiexing Wu Huilin Yang Huan Zhou Xiao Lin Lei Yang College of Chemistry Chemical Engineering and Materials ScienceOrthopaedic InstituteDepartment of Orthopaedic SurgeryThe First Affiliated HospitalSoochow UniversitySuzhou 215031China Center for Health Sciences and Engineering(CHSE) School of Health Sciences and Biomedical EngineeringHebei University of TechnologyTianjin 300130China Department of Minimally Invasive Spine Surgery Tianjin HospitalTianjin 300211China

Although hydrogels have demonstrated great potential as new wound dressing materials,their instability in shape and/or mechanical characteristics due to water loss or freezing remains a shortcoming for wound care application.Herein,a novel injectable organohydrogel(IOH)of physically crosslinked polyvinyl alco-hol/glycerol that possesses non-drying capability and high stability at low temperature was developed for wound care.IOH has a skin-like stiffness(G’,∼280 Pa),high injectability,self-healing capability,high water-vapor transmission rate,and bacterial inhibitory effect.IOH exhibits high shape and mechanical stabilities after curing at 37°C and 50%relative humidity for 7 days or after curing at-20°C for 1 day.In addition,glycerol in IOH enabled an efficient loading and release of water-insoluble curcumin,a well-known anti-bacterial and anti-inflammation drug.The curcumin-releasing IOH(Cur-IOH)demonstrated significantly enhanced anti-bacterial performance compared to IOH or curcumin-loading polyvinyl alco-hol hydrogel.More importantly,Cur-IOH could accelerate wound healing in a murine full-thickness skin defect wound model,revealing improved wound contraction,collagen deposition,angiogenesis,and epi-dermis formation.This study demonstrates the great potential of organohydrogel for the reparation of severe wounds and Cur-IOH as a new type of injectable wound healing material.

关键词： Wound dressing organohydrogel Non-drying Stability Curcumin

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MXene-enhanced environmentally stable organohydrogel ionic diode toward harvesting ultralow-frequency mechanical energy and moisture energy

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SusMat 2023年第6期3卷 859-876页

作者： Jianyu Yin Nishuang Liu Peixue Jia Ziqi Ren Qixiang Zhang Wenzhong Lu Qianqian Yao Mingfang Deng Yihua Gao School of Physics&Wuhan National Laboratory for Optoelectronics(WNLO) Huazhong University of Science and Technology(HUST)WuhanChina

With the accelerating advancement of distributed sensors and portable electronic devices in the era of big data,harvesting energy from the surrounding environment to power electrical devices has become increasingly attractive.However,most mechanical energy harvesters often require high operating frequencies to function properly.Moreover,for practical applications,the survivability of devices in harsh operating environments is a vital issuewhich must be addressed.Besides,the single-stimulus responsiveness limits their further applications in complex external environments.Here,a pressure and moisture dual-responsive ionic diode consisting of two organohydrogels with opposite charges as an energy harvester is proposed.The organohydrogel ionic diode utilizes the migration of cations and anions to form the depletion zone and followed by an enhancement of the built-in potential along the depletion zone as a result of mechanical stress or humidity,converting ultralow-frequency mechanical energy or moisture energy into electrical energy.Meanwhile,this mechanism is further confirmed by the finite element analysis.With the increased rectification ratio due to the introduction of MXene,the ionic diode exhibits a relatively large output current(∼10.10μA cm^(−2))and power density(∼0.10μW cm^(−2))at a mechanical pressure of 0.01 Hz,outperforming most currently available mechanical energy harvesters.More impressively,the incorporation of ethylene glycol provides the hydrogel ionic diode with excellent temperature tolerance and long-term environmental stability.The organohydrogel ionic diode can also be applied as a moisture-driven power generator and self-powered humidity sensor.This study presents promising prospects for the efficient collection of renewable and sustainable energy and the practical application of hydrogel-based energy harvesters in extreme environments.

关键词： energy harvesting environmentally stable ionic diode organohydrogel ultralow frequency

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