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https://www.readbyqxmd.com/read/28636322/spirally-structured-conductive-composites-for-highly-stretchable-robust-conductors-and-sensors
#1
Xiaodong Wu, Yangyang Han, Xinxing Zhang, Canhui Lu
Flexible and stretchable electronics are highly desirable for next generation devices. However, stretchability and conductivity are fundamentally difficult to combine for conventional conductive composites, which restricts their widespread applications especially as stretchable electronics. Here, we innovatively develop a new class of highly stretchable and robust conductive composites via a simple and scalable structural approach. Briefly, carbon nanotubes are spray-coated onto a self-adhesive rubber film, followed by rolling up the film completely to create a spirally layered structure within the composites...
June 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28631401/a-polyacrylamide-hydrogel-electrolyte-enabled-intrinsically-1000-stretchable-and-50-compressible-supercapacitor
#2
Yan Huang, Ming Zhong, Fukuan Shi, Xiaoying Liu, Zijie Tang, Yukun Wang, Yang Huang, Haoqing Hou, Xuming Xie, Chunyi Zhi
Stretchability and compressibility of supercapacitors constitute essential elements of modern electronics such as flexible and wearable devices. Widely-used polyvinyl alcohol-based electrolytes are neither very stretchable nor compressible, which fundamentally limit the realization of high stretchability and compressibility of supercapacitors. We present a new electrolyte that is intrinsically super-stretchable and compressible. Vinyl hybrid silica nanoparticle cross-linkers are introduced into polyacrylamide hydrogel backbones to promote dynamic crosslinking of the polymer networks...
June 19, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28630897/flexible-and-stretchable-power-sources-for-wearable-electronics
#3
Alla M Zamarayeva, Aminy E Ostfeld, Michael Wang, Jerica K Duey, Igal Deckman, Balthazar P Lechêne, Greg Davies, Daniel A Steingart, Ana Claudia Arias
Flexible and stretchable power sources represent a key technology for the realization of wearable electronics. Developing flexible and stretchable batteries with mechanical endurance that is on par with commercial standards and offer compliance while retaining safety remains a significant challenge. We present a unique approach that demonstrates mechanically robust, intrinsically safe silver-zinc batteries. This approach uses current collectors with enhanced mechanical design, such as helical springs and serpentines, as a structural support and backbone for all battery components...
June 2017: Science Advances
https://www.readbyqxmd.com/read/28628325/tuning-optical-signatures-of-single-and-few-layer-mos2-by-blown-bubble-bulge-straining-up-to-fracture
#4
Rui Yang, Jaesung Lee, Souvik Ghosh, Hao Tang, R Mohan Sankaran, Christian A Zorman, Philip X-L Feng
Emerging atomic layer semiconducting crystals such as molybdenum disulfide (MoS2) are promising candidates for flexible electronics and strain-tunable devices due to their ultrahigh strain limits (up to ~20-30%) and strain-tunable bandgaps. However, high strain levels, controllable isotropic and anisotropic biaxial strains in single- and few-layer MoS2 on device-oriented flexible substrates permitting convenient and fast strain tuning, remain unexplored. Here, we demonstrate a blown-bubble bulge technique for efficiently applying large biaxial strains to atomic layer MoS2 devices on flexible substrate...
June 19, 2017: Nano Letters
https://www.readbyqxmd.com/read/28621041/extraordinarily-stretchable-all-carbon-collaborative-nanoarchitectures-for-epidermal-sensors
#5
Yichen Cai, Jie Shen, Ziyang Dai, Xiaoxian Zang, Qiuchun Dong, Guofeng Guan, Lain-Jong Li, Wei Huang, Xiaochen Dong
Multifunctional microelectronic components featuring large stretchability, high sensitivity, high signal-to-noise ratio (SNR), and broad sensing range have attracted a huge surge of interest with the fast developing epidermal electronic systems. Here, the epidermal sensors based on all-carbon collaborative percolation network are demonstrated, which consist 3D graphene foam and carbon nanotubes (CNTs) obtained by two-step chemical vapor deposition processes. The nanoscaled CNT networks largely enhance the stretchability and SNR of the 3D microarchitectural graphene foams, endowing the strain sensor with a gauge factor as high as 35, a wide reliable sensing range up to 85%, and excellent cyclic stability (>5000 cycles)...
June 16, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28580999/3d-printable-composite-dough-for-stretchable-ultrasensitive-and-body-patchable-strain-sensors
#6
Ju Young Kim, Seulgi Ji, Sungmook Jung, Beyong-Hwan Ryu, Hyun-Suk Kim, Sun Sook Lee, Youngmin Choi, Sunho Jeong
The recent development of strain sensor devices which can actively monitor human body motion has attracted tremendous attention, for application in various wearable electronics and human-machine interfaces. In this study, as materials for strain sensor devices, we exploit the low-cost, carbon-based, 3-dimensional (3D) printable composite dough. The dough is prepared via a chemical method based on the formation of electrostatic assemblies between 1-dimensional, amine-functionalized, multi-walled carbon nanotubes and 2-dimensional graphene oxides...
June 5, 2017: Nanoscale
https://www.readbyqxmd.com/read/28580425/ultrastretchable-transparent-triboelectric-nanogenerator-as-electronic-skin-for-biomechanical-energy-harvesting-and-tactile-sensing
#7
Xiong Pu, Mengmeng Liu, Xiangyu Chen, Jiangman Sun, Chunhua Du, Yang Zhang, Junyi Zhai, Weiguo Hu, Zhong Lin Wang
Rapid advancements in stretchable and multifunctional electronics impose the challenge on corresponding power devices that they should have comparable stretchability and functionality. We report a soft skin-like triboelectric nanogenerator (STENG) that enables both biomechanical energy harvesting and tactile sensing by hybridizing elastomer and ionic hydrogel as the electrification layer and electrode, respectively. For the first time, ultrahigh stretchability (uniaxial strain, 1160%) and transparency (average transmittance, 96...
May 2017: Science Advances
https://www.readbyqxmd.com/read/28561953/binary-synergistic-sensitivity-strengthening-of-bioinspired-hierarchical-architectures-based-on-fragmentized-reduced-graphene-oxide-sponge-and-silver-nanoparticles-for-strain-sensors-and-beyond
#8
Songfang Zhao, Lingzhi Guo, Jinhui Li, Ning Li, Guoping Zhang, Yongju Gao, Jia Li, Duxia Cao, Wei Wang, Yufeng Jin, Rong Sun, Ching-Ping Wong
Recently, stretchable electronics have been highly desirable in the Internet of Things and electronic skins. Herein, an innovative and cost-efficient strategy is demonstrated to fabricate highly sensitive, stretchable, and conductive strain-sensing platforms inspired by the geometries of a spiders slit organ and a lobsters shell. The electrically conductive composites are fabricated via embedding the 3D percolation networks of fragmentized graphene sponges (FGS) in poly(styrene-block-butadiene-block-styrene) (SBS) matrix, followed by an iterative process of silver precursor absorption and reduction...
May 31, 2017: Small
https://www.readbyqxmd.com/read/28547895/review-of-flexible-temperature-sensing-networks-for-wearable-physiological-monitoring
#9
REVIEW
Qiao Li, Li-Na Zhang, Xiao-Ming Tao, Xin Ding
Physiological temperature varies temporally and spatially. Accurate and real-time detection of localized temperature changes in biological tissues regardless of large deformation is crucial to understand thermal principle of homeostasis, to assess sophisticated health conditions, and further to offer possibilities of building a smart healthcare and medical system. Additionally, continuous temperature mapping in flexible and stretchable formats opens up many other potential areas, such as artificially electronic skins and reflection of emotional changes...
June 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28547847/stretchable-platinum-network-based-transparent-electrodes-for-highly-sensitive-wearable-electronics
#10
Yuting Wang, Jing Cheng, Yan Xing, Muhammad Shahid, Hiroki Nishijima, Wei Pan
A platinum network-based transparent electrode has been fabricated by electrospinning. The unique nanobelt structured electrode demonstrates low sheet resistance (about 16 Ω sq(-1) ) and high transparency of 80% and excellent flexibility. One of the most interesting demonstrations of this Pt nanobelt electrode is its excellent reversibly resilient characteristic. The electric conductivity of the flexible Pt electrode can recover to its initial value after 160% extending and this performance is repeatable and stable...
May 26, 2017: Small
https://www.readbyqxmd.com/read/28535341/fully-stretchable-optoelectronic-sensors-based-on-colloidal-quantum-dots-for-sensing-photoplethysmographic-signals
#11
Tae-Ho Kim, Chang-Seok Lee, Sangwon Kim, Jaehyun Hur, Sangmin Lee, Keun Wook Shin, Young-Zoon Yoon, Moon Kee Choi, Jiwoong Yang, Dae-Hyeong Kim, Taeghwan Hyeon, Seongjun Park, Sungwoo Hwang
Flexible and stretchable optoelectronic devices can be potentially applied in displays, biosensors, biomedicine, robotics, and energy generation. The use of nanomaterials with superior optical properties such as quantum dots (QDs) is important in the realization of wearable displays and biomedical devices, but specific structural design as well as selection of materials should preferentially accompany this technology to realize stretchable forms of these devices. Here, we report stretchable optoelectronic sensors manufactured using colloidal QDs and integrated with elastomeric substrates, whose optoelectronic properties are stable under various deformations...
May 26, 2017: ACS Nano
https://www.readbyqxmd.com/read/28496101/stretchable-twisted-conductive-microtubules-for-wearable-computing-robotics-electronics-and-healthcare
#12
Thanh Nho Do, Yon Visell
Stretchable and flexible multifunctional electronic components, including sensors and actuators, have received increasing attention in robotics, electronics, wearable, and healthcare applications. Despite advances, it has remained challenging to design analogs of many electronic components to be highly stretchable, to be efficient to fabricate, and to provide control over electronic performance. Here, we describe highly elastic sensors and interconnects formed from thin, twisted conductive microtubules. These devices consist of twisted assemblies of thin, highly stretchable (>400%) elastomer tubules filled with liquid conductor (eutectic gallium indium, EGaIn), and fabricated using a simple roller coating process...
May 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28489294/a-transparent-highly-stretchable-autonomous-self-healing-poly-dimethyl-siloxane-elastomer
#13
Baolin Zhang, Ping Zhang, Hanzhi Zhang, Casey Yan, Zijian Zheng, Biao Wu, You Yu
An innovative self-healing polydimethylsiloxane (PDMS) elastomer, namely, PDMS-TFB, is reported by incorporating the reversibly dynamic imine bond as the self-healing points into the PDMS networks. The PDMS-TFB elastomer features good optical transmittance (80%) in full visible light region, high stretchability (≈700%), and excellent autonomous self-healing ability at room temperature. Surprisingly, the self-healing behavior can take place in water and even at a temperature as low as -20 °C in air, showing a promising outlook for broader applications...
May 10, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28485567/stretchable-transparent-and-stretch-unresponsive-capacitive-touch-sensor-array-with-selectively-patterned-silver-nanowires-reduced-graphene-oxide-electrodes
#14
Tae Young Choi, Byeong-Ung Hwang, Bo-Yeong Kim, Tran Quang Trung, Yun Hyoung Nam, Do-Nyun Kim, Kilho Eom, Nae-Eung Lee
Stretchable and transparent touch sensors are essential input devices for future stretchable transparent electronics. Capacitive touch sensors with a simple structure of only two electrodes and one dielectric are an established technology in current rigid electronics. However, the development of stretchable and transparent capacitive touch sensors has been limited due to changes in capacitance resulting from dimensional changes in elastomeric dielectrics and difficulty in obtaining stretchable transparent electrodes that are stable under large strains...
May 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28482149/ultrathin-epitaxial-cu-au-core-shell-nanowires-for-stable-transparent-conductors
#15
Zhiqiang Niu, Fan Cui, Yi Yu, Nigel Becknell, Yuchun Sun, Garo Khanarian, Dohyung Kim, Letian Dou, Ahmad Dehestani, Kerstin Schierle-Arndt, Peidong Yang
Copper nanowire networks are considered a promising alternative to indium tin oxide as transparent conductors. The fast degradation of copper in ambient conditions, however, largely overshadows their practical applications. Here, we develop the synthesis of ultrathin Cu@Au core-shell nanowires using trioctylphosphine as a strong binding ligand to prevent galvanic replacement reactions. The epitaxial overgrowth of a gold shell with a few atomic layers on the surface of copper nanowires can greatly enhance their resistance to heat (80 °C), humidity (80%) and air for at least 700 h, while their optical and electrical performance remained similar to the original high-performance copper (e...
May 18, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28474793/3d-printed-stretchable-tactile-sensors
#16
Shuang-Zhuang Guo, Kaiyan Qiu, Fanben Meng, Sung Hyun Park, Michael C McAlpine
The development of methods for the 3D printing of multifunctional devices could impact areas ranging from wearable electronics and energy harvesting devices to smart prosthetics and human-machine interfaces. Recently, the development of stretchable electronic devices has accelerated, concomitant with advances in functional materials and fabrication processes. In particular, novel strategies have been developed to enable the intimate biointegration of wearable electronic devices with human skin in ways that bypass the mechanical and thermal restrictions of traditional microfabrication technologies...
May 5, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28470286/design-and-application-of-j-shaped-stress-strain-behavior-in-stretchable-electronics-a-review
#17
REVIEW
Yinji Ma, Xue Feng, John A Rogers, Yonggang Huang, Yihui Zhang
A variety of natural biological tissues (e.g., skin, ligaments, spider silk, blood vessel) exhibit 'J-shaped' stress-strain behavior, thereby combining soft, compliant mechanics and large levels of stretchability, with a natural 'strain-limiting' mechanism to prevent damage from excessive strain. Synthetic materials with similar stress-strain behaviors have potential utility in many promising applications, such as tissue engineering (to reproduce the nonlinear mechanical properties of real biological tissues) and biomedical devices (to enable natural, comfortable integration of stretchable electronics with biological tissues/organs)...
May 16, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28466937/transparent-flexible-and-stretchable-ws2-based-humidity-sensors-for-electronic-skin
#18
Huayang Guo, Changyong Lan, Zhifei Zhou, Peihua Sun, Dapeng Wei, Chun Li
Skin-mountable chemical sensors using flexible chemically sensitive nanomaterials are of great interest for electronic skin (e-skin) application. To build these sensors, the emerging atomically thin two-dimensional (2D) layered semiconductors could be a good material candidate. Herein, we show that a large-area WS2 film synthesized by sulfurization of a tungsten film exhibits high humidity sensing performance both in natural flat and high mechanical flexible states (bending curvature down to 5 mm). The conductivity of as-synthesized WS2 increases sensitively over a wide relative humidity range (up to 90%) with fast response and recovery times in a few seconds...
May 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28453282/stretchable-thermoelectric-generators-metallized-with-liquid-alloy
#19
Seung Hee Jeong, Francisco Javier Cruz, Si Chen, Laurent Gravier, Johan Liu, Zhigang Wu, Klas Hjort, Shi-Li Zhang, Zhi-Bin Zhang
Conventional thermoelectric generators (TEGs) are normally hard, rigid, and flat. However, most objects have curvy surfaces, which require soft and even stretchable TEGs for maximizing efficiency of thermal energy harvesting. Here, soft and stretchable TEGs using conventional rigid Bi2Te3 pellets metallized with a liquid alloy is reported. The fabrication is implemented by means of a tailored layer-by-layer fabrication process. The STEGs exhibit an output power density of 40.6 μW/cm(2) at room temperature...
April 28, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28446020/direct-writing-of-microfluidic-footpaths-by-pyro-ehd-printing
#20
Sara Coppola, Giuseppe Nasti, Michele Todino, Federico Olivieri, Veronica Vespini, Pietro Ferraro
In this study, we report a direct writing method for the fabrication of microfluidic footpaths by pyro-electrohydrodynamic (EHD) jet printing. Here, we propose the use of a nozzle-free three-dimensional printing technique for the fabrication of printed structures that can be embedded in a variety of soft, transparent, flexible, and biocompatible polymers and thus easily integrated into lab-on-chip devices. We prove the advantage of the high resolution and flexibility of pyro-EHD printing for the realization of microfluidic channels well below the standard limit in dimension of conventional ink-jet printing technique and simply adaptable to the end-user desires in terms of geometry and materials...
May 5, 2017: ACS Applied Materials & Interfaces
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