A skin-like stretchable colorimetric temperature sensor

Chen, Yingzhi; Yin, Xia; Li, Wenhao; Long, Yi; Li, Jingyuan; Wang, Luning; Zhang, Shun

doi:10.1007/s40843-018-9266-8

Cited by 24 publications

(15 citation statements)

References 57 publications

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“…On the other hand, taking advantage of the conductivity of liquid metals has shown promise in the area of skin electronics, [ 150 ] flexible robots, [ 151,152 ] and flexible detection sensors, [ 108,153,154 ] owing to flexible and appropriate elastic modulus of polymer substrates. To improve printing accuracy and simplicity, the preparation process of liquid metal printing ranges from manual writing, [ 1,155 ] mask deposition manufacturing, [ 156 ] to 3D printing, [ 154,157,158 ] as shown in Figure .…”

Section: Interfacial Engineering Of Liquid Metal/solid Substratementioning

confidence: 99%

Interfacial Engineering of Room Temperature Liquid Metals

Liu

Cui

et al. 2021

Adv Materials Inter

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and formed spontaneously and instantaneously upon exposure to atmospheric oxygen. [1-3] The thin film or "protective skin" covering the surface of RTLMs, generally dominated the physical properties and applications of the materials. This thin film is composed of a majority fraction of gallium oxides with a much smaller amount of indium and tin oxides. [4] When immersed in acidic or alkaline electrolytes, the oxidic films of RTLMs will be dissolved. [5-8] Due to the disorder of internal structure, the surface of the spherical liquid metal droplet is smooth and removable under the function of surface tension. [9,10] According to the size and structure of the solid substrate, the contact areas between the liquid metal and the solid substrate shows various wetting phenomena and corresponding application scenarios. [11-14] Surface chemical composition plays the primary role in dominating various phenomena and practical applications of RTLMs, which possessed the technologically important and scientifically interesting parameter. Gallium-based liquid metal is similar in structure to conventional solid metal, except for some covalent bonds inside, and the physicochemical properties have the commonality of both metallic solid and fluid properties. [15] The composition of gallium-based alloys can be assumed as made up of several atomic groups, within which the permutation of the solid remains, the binding energy between the liquid atoms remains strong, but the binding force between the groups was broken. The interface refers to the contact area between the different phases, which is the transition layer from one phase to another. The binding force of electrons that are relatively far away from the inner core is related to their energy, causing the interface behavior between different phases to be incompletely consistent. The surface is a type of interface, which specifically refers to the gas phase substance in interfacial behavior. In the processes of thermodynamics, [16,17] surface absorption, [18,19] controllable wetting, [6,13,20] material catalysis, [21,22] redox, and other physical and chemical reactions, [23,24] RTLMs inevitably contact with other substances with different phase states. Even the pure liquid metal would contact with oxygen in the air to yield a thin protective film. [17,25,26] Therefore, the investigation of interfacial behaviors between RTLMs and different surrounding mediums is helpful to renovate and broaden the understanding and applications of liquid metal. So far, there gradually appeared literature on phenomena and mechanism of the interfacial effect of RTLMs, such as synthesis of low-dimensional materials in the gas atmosphere, [27,28] Room temperature liquid metals (RTLMs), especially those made of galliumbased alloys belong to an emerging versatile material with fascinating characteristics derived from its simultaneous metallic and inherent fluidic natures. The interfacial effects of liquid metal involved in diverse surfaces thus play critical roles in explaining many fundamental phenomena....

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Section: Interfacial Engineering Of Liquid Metal/solid Substratementioning

confidence: 99%

Interfacial Engineering of Room Temperature Liquid Metals

Liu

Cui

et al. 2021

Adv Materials Inter

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“…163 The thermoresistive effect, in which the resistivity of a material exhibits a temperature dependency, arises from the thermally induced change of the number of charge carriers, their mobility, and the scattering effect of lattice vibrations. 163 The pyroelectric effect (e.g., ZnO NWs), 164 thermoelectric effect (e.g., Si nanostructures), 81 and thermochromic effect (e.g., polydiacetylenes) 165 have also been used as the technical bases for stretchable temperature sensors.…”

Section: B Temperature Sensorsmentioning

confidence: 99%

Stretchable sensors for environmental monitoring

Yang

Deng

2019

Applied Physics Reviews

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The development of flexible and stretchable sensors has been receiving increasing attention in recent years. In particular, stretchable, skin-like, wearable sensors are desirable for a variety of potential applications such as personalized health monitoring, human-machine interfaces, and environmental sensing. In this paper, we review recent advancements in the development of mechanically flexible and stretchable sensors and systems that can be used to quantitatively assess environmental parameters including light, temperature, humidity, gas, and pH. We discuss innovations in the device structure, material selection, and fabrication methods which explain the stretchability characteristics of these environmental sensors and provide a detailed and comparative study of their sensing mechanisms, sensor characteristics, mechanical performance, and limitations. Finally, we provide a summary of current challenges and an outlook on opportunities for possible future research directions for this emerging field.

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“…Specifically, thermo-responsive and pH-sensitive hydrogels have been employed for targeted delivery and sustained release of biological compounds [ 5 , 6 , 7 ]. These hydrogels generally require different environmental stimulators, such as magnetic and electric fields [ 8 , 9 ], biomolecule concentration [ 10 , 11 ], and temperature [ 12 , 13 ] to control their swelling properties. Meanwhile, extensive efforts have been put to prepare unique hydrogels with improved physical, mechanical, and biomedical properties for a wide range of applications [ 14 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

Developing Novel Fabrication and Optimisation Strategies on Aggregation-Induced Emission Nanoprobe/Polyvinyl Alcohol Hydrogels for Bio-Applications

et al. 2022

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The current study describes a new technology, effective for readily preparing a fluorescent (FL) nanoprobe-based on hyperbranched polymer (HB) and aggregation-induced emission (AIE) fluorogen with high brightness to ultimately develop FL hydrogels. We prepared the AIE nanoprobe using a microfluidic platform to mix hyperbranched polymers (HB, generations 2, 3, and 4) with AIE (TPE-2BA) under shear stress and different rotation speeds (0–5 K RPM) and explored the FL properties of the AIE nanoprobe. Our results reveal that the use of HB generation 4 exhibits 30-times higher FL intensity compared to the AIE alone and is significantly brighter and more stable compared to those that are prepared using HB generations 3 and 2. In contrast to traditional methods, which are expensive and time-consuming and involve polymerization and post-functionalization to develop FL hyperbranched molecules, our proposed method offers a one-step method to prepare an AIE-HB nanoprobe with excellent FL characteristics. We employed the nanoprobe to fabricate fluorescent injectable bioadhesive gel and a hydrogel microchip based on polyvinyl alcohol (PVA). The addition of borax (50 mM) to the PVA + AIE nanoprobe results in the development of an injectable bioadhesive fluorescent gel with the ability to control AIEgen release for 300 min. When borax concentration increases two times (100 mM), the adhesion stress is more than two times bigger (7.1 mN/mm2) compared to that of gel alone (3.4 mN/mm2). Excellent dimensional stability and cell viability of the fluorescent microchip, along with its enhanced mechanical properties, proposes its potential applications in mechanobiology and understanding the impact of microstructure in cell studies.

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A skin-like stretchable colorimetric temperature sensor

Cited by 24 publications

References 57 publications

Interfacial Engineering of Room Temperature Liquid Metals

Interfacial Engineering of Room Temperature Liquid Metals

Stretchable sensors for environmental monitoring

Developing Novel Fabrication and Optimisation Strategies on Aggregation-Induced Emission Nanoprobe/Polyvinyl Alcohol Hydrogels for Bio-Applications

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