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https://www.readbyqxmd.com/read/28535341/fully-stretchable-optoelectronic-sensors-based-on-colloidal-quantum-dots-for-sensing-photoplethysmographic-signals
#1
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 23, 2017: ACS Nano
https://www.readbyqxmd.com/read/28496101/stretchable-twisted-conductive-microtubules-for-wearable-computing-robotics-electronics-and-healthcare
#2
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
#3
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
#4
Taeyoung 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 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28482149/ultrathin-epitaxial-cu-au-core-shell-nanowires-for-stable-transparent-conductors
#5
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 oC), humidity (80%) and air for at least 700 hours, while their optical and electrical performance remained similar to the original high-performance copper (e...
May 8, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28474793/3d-printed-stretchable-tactile-sensors
#6
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
#7
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
#8
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
#9
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
#10
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
https://www.readbyqxmd.com/read/28439415/stretchable-biofuel-cells-as-wearable-textile-based-self-powered-sensors
#11
Itthipon Jeerapan, Juliane R Sempionatto, Adriana Pavinatto, Jung-Min You, Joseph Wang
Highly stretchable textile-based biofuel cells (BFCs), acting as effective self-powered sensors, have been fabricated using screen-printing of customized stress-enduring inks. Due to synergistic effects of nanomaterial-based engineered inks and the serpentine designs, these printable bioelectronic devices endure severe mechanical deformations, e.g., stretching, indentation, or torsional twisting. Glucose and lactate BFCs with the single enzyme and membrane-free configurations generated the maximum power density of 160 and 250 µW cm(-2) with the open circuit voltages of 0...
December 21, 2016: Journal of Materials Chemistry. A, Materials for Energy and Sustainability
https://www.readbyqxmd.com/read/28436600/high-performance-integrated-self-package-flexible-li-o2-battery-based-on-stable-composite-anode-and-flexible-gas-diffusion-layer
#12
Xiao-Yang Yang, Ji-Jing Xu, Di Bao, Zhi-Wen Chang, Da-Peng Liu, Yu Zhang, Xin-Bo Zhang
With the rising development of flexible and wearable electronics, corresponding flexible energy storage devices with high energy density are required to provide a sustainable energy supply. Theoretically, rechargeable flexible Li-O2 batteries can provide high specific energy density; however, there are only a few reports on the construction of flexible Li-O2 batteries. Conventional flexible Li-O2 batteries possess a loose battery structure, which prevents flexibility and stability. The low mechanical strength of the gas diffusion layer and anode also lead to a flexible Li-O2 battery with poor mechanical properties...
April 24, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28436426/stretchable-ag-electrodes-with-mechanically-tunable-optical-transmittance-on-wavy-patterned-pdms-substrates
#13
Eun-Hye Ko, Hyo-Joong Kim, Sang-Mok Lee, Tae-Woong Kim, Han-Ki Kim
We report on semi-transparent stretchable Ag films coated on a wavy-patterned polydimethylsiloxane (PDMS) substrate for use as stretchable electrodes for stretchable and transparent electronics. To improve the mechanical stretchability of the Ag films, we optimized the wavy-pattern of the PDMS substrate as a function of UV-ozone treatment time and pre-strain of the PDMS substrate. In addition, we investigated the effect of the Ag thickness on the mechanical stretchability of the Ag electrode formed on the wavy-patterned PDMS substrate...
April 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28417536/stretchable-and-soft-electronics-using-liquid-metals
#14
REVIEW
Michael D Dickey
The use of liquid metals based on gallium for soft and stretchable electronics is discussed. This emerging class of electronics is motivated, in part, by the new opportunities that arise from devices that have mechanical properties similar to those encountered in the human experience, such as skin, tissue, textiles, and clothing. These types of electronics (e.g., wearable or implantable electronics, sensors for soft robotics, e-skin) must operate during deformation. Liquid metals are compelling materials for these applications because, in principle, they are infinitely deformable while retaining metallic conductivity...
April 18, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28415424/development-of-strong-biodegradable-and-highly-elastomeric-polycitrate-gelatin-hybrid-polymer-with-enhanced-cellular-biocompatibility
#15
Caiting Feng, Yuzhang Du, Yannan Li, Bo Lei
Native human tissues possess incomparable biological performance due to their strong and viscoelastic mechanical properties, and biocompatible compositions. Herein, by a thermal polymerization and solvent hybridization method, we develop biomimetic polycitrate-gelatin hybrid polymers (PC-GT) with strong mechanical properties and tailored elastomeric behavior for tissue regeneration applications. The incorporation of gelatin significantly enhanced the mechanical properties and cellular biocompatibility of PC...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28413376/ferromagnetic-folded-electrode-composite-as-a-soft-interface-to-the-skin-for-long-term-electrophysiological-recording
#16
Kyung-In Jang, Han Na Jung, Jung Woo Lee, Sheng Xu, Yu Hao Liu, Yinji Ma, Jae-Woong Jeong, Young Min Song, Jeonghyun Kim, Bong Hun Kim, Anthony Banks, Jean Won Kwak, Yiyuan Yang, Dawei Shi, Zijun Wei, Xue Feng, Ungyu Paik, Yonggang Huang, Roozbeh Ghaffari, John A Rogers
This paper introduces a class of ferromagnetic, folded, soft composite material for skin-interfaced electrodes with releasable interfaces to stretchable, wireless electronic measurement systems. These electrodes establish intimate, adhesive contacts to the skin, in dimensionally stable formats compatible with multiple days of continuous operation, with several key advantages over conventional hydrogel based alternatives. The reported studies focus on aspects ranging from ferromagnetic and mechanical behavior of the materials systems, to electrical properties associated with their skin interface, to system-level integration for advanced electrophysiological monitoring applications...
October 25, 2016: Advanced Functional Materials
https://www.readbyqxmd.com/read/28398032/novel-electrically-conductive-porous-pdms-carbon-nanofiber-composites-for-deformable-strain-sensors-and-conductors
#17
Shuying Wu, Jin Zhang, Raj B Ladani, Anil R Ravindran, Adrian P Mouritz, Anthony J Kinloch, Chun H Wang
Highly flexible and deformable electrically conductive materials are vital for the emerging field of wearable electronics. To address the challenge of flexible materials with a relatively high electrical conductivity and a high elastic limit, we report a new and facile method to prepare porous polydimethylsiloxane/carbon nanofiber composites (denoted by p-PDMS/CNF). This method involves using sugar particles coated with carbon nanofibers (CNFs) as the templates. The resulting three-dimensional porous nanocomposites, with the CNFs embedded in the PDMS pore walls, exhibit a greatly increased failure strain (up to ∼94%) compared to that of the solid, neat PDMS (∼48%)...
April 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28387470/a-free-standing-and-self-healable-2d-supramolecular-material-based-on-hydrogen-bonding-a-nanowire-array-with-sub-2-nm-resolution
#18
Ming Li, Mengyao Song, Guitai Wu, Zhenyu Tang, Yunfeng Sun, Yunbin He, Jinhua Li, Lei Li, Haoshuang Gu, Xiong Liu, Chuang Ma, Zefei Peng, Zhaoquan Ai, David J Lewis
In many 2D materials reported thus far, the forces confining atoms in a 2D plane are often strong interactions, such as covalent bonding. Herein, the first demonstration that hydrogen (H)-bonding can be utilized to assemble polydiacetylene (a conductive polymer) toward a 2D material, which is stable enough to be free-standing, is shown. The 2D material is well characterized by a large number of techniques (mainly different microscopy techniques). The H-bonding allows splitting of the material into ribbons, which can reassemble, similar to a zipper, leading to the first example of a healable 2D material...
April 7, 2017: Small
https://www.readbyqxmd.com/read/28387425/an-all-stretchable-component-sodium-ion-full-battery
#19
Hongsen Li, Yu Ding, Heonjoo Ha, Ye Shi, Lele Peng, Xiaogang Zhang, Christopher J Ellison, Guihua Yu
Stretchable energy-storage devices receive considerable attention due to their promising applications in future wearable technologies. However, they currently suffer from many problems, including low utility of active materials, limited multidirectional stretchability, and poor stability under stretched conditions. In addition, most proposed designs use one or more rigid components that fail to meet the stretchability requirement for the entire device. Here, an all-stretchable-component sodium-ion full battery based on graphene-modified poly(dimethylsiloxane) sponge electrodes and an elastic gel membrane is developed for the first time...
April 7, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28379278/directly-embroidered-microtubes-for-fluid-transport-in-wearable-applications
#20
Rahim Rahimi, Wuyang Yu, Manuel Ochoa, Babak Ziaie
We demonstrate, for the first time, a facile and low-cost approach for integrating highly flexible and stretchable microfluidic channels into textile-based substrates. The integration of the microfluidics is accomplished by means of directly embroidering surface-functionalized micro-tubing in a zigzag/meander pattern and subsequently coating it with an elastomer for irreversible bonding. We show the utility of the embroidered micro-tubing by developing robust and stretchable drug-delivery and electronic devices...
May 2, 2017: Lab on a Chip
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