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https://www.readbyqxmd.com/read/29148212/flexible-stretchable-and-transparent-planar-microsupercapacitors-based-on-3d-porous-laser-induced-graphene
#1
Weixing Song, Jianxiong Zhu, Baoheng Gan, Shuyu Zhao, Hui Wang, Congju Li, Jie Wang
The graphene with 3D porous network structure is directly laser-induced on polyimide sheets at room temperature in ambient environment by an inexpensive and one-step method, then transferred to silicon rubber substrate to obtain highly stretchable, transparent, and flexible electrode of the all-solid-state planar microsupercapacitors. The electrochemical capacitance properties of the graphene electrodes are further enhanced by nitrogen doping and with conductive poly(3,4-ethylenedioxythiophene) coating. With excellent flexibility, stretchability, and capacitance properties, the planar microsupercapacitors present a great potential in fashionable and comfortable designs for wearable electronics...
November 17, 2017: Small
https://www.readbyqxmd.com/read/29134702/editable-supercapacitors-with-customizable-stretchability-based-on-mechanically-strengthened-ultralong-mno2-nanowire-composite
#2
Zhisheng Lv, Yifei Luo, Yuxin Tang, Jiaqi Wei, Zhiqiang Zhu, Xinran Zhou, Wenlong Li, Yi Zeng, Wei Zhang, Yanyan Zhang, Dianpeng Qi, Shaowu Pan, Xian Jun Loh, Xiaodong Chen
Although some progress has been made on stretchable supercapacitors, traditional stretchable supercapacitors fabricated by predesigning structured electrodes for device assembling still lack the device-level editability and programmability. To adapt to wearable electronics with arbitrary configurations, it is highly desirable to develop editable supercapacitors that can be directly transferred into desirable shapes and stretchability. In this work, editable supercapacitors for customizable shapes and stretchability using electrodes based on mechanically strengthened ultralong MnO2 nanowire composites are developed...
November 14, 2017: Advanced Materials
https://www.readbyqxmd.com/read/29128591/hemicellulose-isolated-from-waste-liquor-of-viscose-fiber-mill-for-preparation-of-polyacrylamide-hemicellulose-hybrid-films
#3
Jian Du, Chao Li, Yadong Zhao, Haisong Wang
Huge amount of waste hemicellulose liquor annually produced in China was burned or discharged into surrounding environment without further sufficient utilization, causing severely environmental issues. In order to solve this problem, this study aimed to find a way to effectively use aqueous waste hemicellulose solution from viscose fiber mills for bio-based materials development. Hereby, Polyacrylamide-Hemicellulose hybrid films were synthesized through the copolymerization of acrylamide (AM) monomers and hemicellulose initiated by potassium persulfate/N,N,N',N'-tetramethylethylenediamine (KPS/TMEDA) redox initiator system with cross-linker N,N-Methylene-bis(acrylamide) (MBA)...
November 8, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29111642/a-stretchable-and-transparent-nanocomposite-nanogenerator-for-self-powered-physiological-monitoring
#4
Xiaoliang Chen, Kaushik Parida, Jiangxin Wang, Jiaqing Xiong, Meng-Fang Lin, Jinyou Shao, Pooi-See Lee
Smart sensing electronic device with good transparency, high stretchability and self-powered sensing characteristics are essential in wearable health monitoring systems. This paper innovatively proposes a stretchable nanocomposite nanogenerator with good transparency that can be conformally attached on human body to harvest biomechanical energy and monitor physiological signals. The work reports an innovative device that uses sprayed silver nanowires as transparent electrodes and sandwiches a nanocomposite of piezoelectric BaTiO3 and PDMS as the sensing layer, which exhibits good transparency and mechanical transformability with stretchable, foldable, and twistable properties...
November 7, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29096360/detection-of-vapor-phase-organophosphate-threats-using-wearable-conformable-integrated-epidermal-and-textile-wireless-biosensor-systems
#5
Rupesh K Mishra, Aida Martín, Tatsuo Nakagawa, Abbas Barfidokht, Xialong Lu, Juliane R Sempionatto, Kay Mengjia Lyu, Aleksandar Karajic, Mustafa M Musameh, Ilias L Kyratzis, Joseph Wang
Flexible epidermal tattoo and textile-based electrochemical biosensors have been developed for vapor-phase detection of organophosphorus (OP) nerve agents. These new wearable sensors, based on stretchable organophosphorus hydrolase (OPH) enzyme electrodes, are coupled with a fully integrated conformal flexible electronic interface that offers rapid and selective square-wave voltammetric detection of OP vapor threats and wireless data transmission to a mobile device. The epidermal tattoo and textile sensors display a good reproducibility (with RSD of 2...
October 20, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29089627/brush-paintable-and-highly-stretchable-ag-nanowire-and-pedot-pss-hybrid-electrodes
#6
Ji-Eun Lim, Sang-Mok Lee, Seok-Soon Kim, Tae-Woong Kim, Hyun-Woo Koo, Han-Ki Kim
Highly transparent and stretchable Ag nanowire (NW)/poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) hybrid electrodes were prepared on stretchable polyurethane substrates by using simple and cost-effective brush painting technique. The optimized Ag NW/PEDOT:PSS hybrid electrode showed a sheet resistance of 19.7 Ohm/square and a high optical transmittance of 88.64% comparable to conventional ITO electrode. It was found that shear stress of the paintbrush led to an effective lateral alignment of the Ag NWs into the PEDOT:PSS matrix during brush painting process...
October 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29083118/self-healing-sensors-based-on-dual-noncovalent-network-elastomer-for-human-motion-monitoring
#7
Jie Cao, Xu Zhang, Canhui Lu, Yongyue Luo, Xinxing Zhang
Nowadays, it is still a challenge to prepare flexible sensors with great mechanical strength, stretchability, high sensitivities, and excellent self-healing (SH) abilities. Herein, a nanostructured supramolecular elastomer is reported with a dual noncovalent network of hydrogen bonding interactions and metal-ligand coordination. The resultant flexible sensor presents ultrafast (30 s), autonomous, and repeatable SH ability with high healing efficiency (80% after the 3rd healing process), as well as enhanced mechanical properties...
October 30, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/29064823/graphene-vertically-aligned-carbon-nanotube-hybrid-on-pdms-as-stretchable-electrodes
#8
Junjun Ding, Shichen Fu, Runzhi Zhang, Eric Boon, Woo Lee, Frank T Fisher, Eui-Hyeok Yang
Stretchable electrodes are a critical component for flexible electronics such as displays, energy devices, and wearable sensors. Carbon nanotubes (CNTs) and graphene have been considered for flexible electrode applications, due to their mechanical strength, high carrier mobility, and excellent thermal conductivity. Vertically aligned carbon nanotubes (VACNTs) provide the possibility to serve as interconnects to graphene sheets as stretchable electrodes that could maintain high electrical conductivity under large tensile strain...
October 24, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29062483/a-highly-stretchable-and-robust-non-fluorinated-superhydrophobic-surface
#9
Jie Ju, Xi Yao, Xu Hou, Qihan Liu, Yu Shrike Zhang, Ali Khademhosseini
Superhydrophobic surface simultaneously possessing exceptional stretchability, robustness, and non-fluorination is highly desirable in applications ranging from wearable devices to artificial skins. While conventional superhydrophobic surfaces typically feature stretchability, robustness, or non-fluorination individually, co-existence of all these features still remains a great challenge. Here we report a multi-performance superhydrophobic surface achieved through incorporating hydrophilic micro-sized particles with pre-stretched silicone elastomer...
August 21, 2017: Journal of Materials Chemistry. A, Materials for Energy and Sustainability
https://www.readbyqxmd.com/read/29058800/on-skin-triboelectric-nanogenerator-and-self-powered-sensor-with-ultrathin-thickness-and-high-stretchability
#10
Xiangyu Chen, Yali Wu, Jiajia Shao, Tao Jiang, Aifang Yu, Liang Xu, Zhong Lin Wang
Researchers have devoted a lot of efforts on pursuing light weight and high flexibility for the wearable electronics, which also requires the related energy harvesting devices to have ultrathin thickness and high stretchability. Hence, an elastic triboelectric nanogenerator (TENG) is proposed that can serve as the second skin on human body. The total thickness of this TENG is about 102 µm and the device can work durably under a strain of 100%. The carbon grease is painted on the surface of elastomer film to work as stretchable electrode and thus the fine geometry control of the electrode can be achieved...
October 23, 2017: Small
https://www.readbyqxmd.com/read/29051943/thermal-and-electronic-transport-characteristics-of-highly-stretchable-graphene-kirigami
#11
Bohayra Mortazavi, Aurélien Lherbier, Zheyong Fan, Ari Harju, Timon Rabczuk, Jean-Christophe Charlier
For centuries, cutting and folding papers with special patterns have been used to build beautiful, flexible and complex three-dimensional structures. Inspired by the old idea of kirigami (paper cutting), and the outstanding properties of graphene, recently graphene kirigami structures were fabricated to enhance the stretchability of graphene. However, the possibility of further tuning the electronic and thermal transport along the 2D kirigami structures has remained original to investigate. We therefore performed extensive atomistic simulations to explore the electronic, heat and load transfer along various graphene kirigami structures...
November 2, 2017: Nanoscale
https://www.readbyqxmd.com/read/29046624/designing-thin-ultrastretchable-electronics-with-stacked-circuits-and-elastomeric-encapsulation-materials
#12
Renxiao Xu, Jung Woo Lee, Taisong Pan, Siyi Ma, Jiayi Wang, June Hyun Han, Yinji Ma, John A Rogers, Yonggang Huang
Many recently developed soft, skin-like electronics with high performance circuits and low modulus encapsulation materials can accommodate large bending, stretching, and twisting deformations. Their compliant mechanics also allows for intimate, nonintrusive integration to the curvilinear surfaces of soft biological tissues. By introducing a stacked circuit construct, the functional density of these systems can be greatly improved, yet their desirable mechanics may be compromised due to the increased overall thickness...
January 26, 2017: Advanced Functional Materials
https://www.readbyqxmd.com/read/29023365/soft-smart-garments-for-lower-limb-joint-position-analysis
#13
Massimo Totaro, Tommaso Poliero, Alessio Mondini, Chiara Lucarotti, Giovanni Cairoli, Jesùs Ortiz, Lucia Beccai
Revealing human movement requires lightweight, flexible systems capable of detecting mechanical parameters (like strain and pressure) while being worn comfortably by the user, and not interfering with his/her activity. In this work we address such multifaceted challenge with the development of smart garments for lower limb motion detection, like a textile kneepad and anklet in which soft sensors and readout electronics are embedded for retrieving movement of the specific joint. Stretchable capacitive sensors with a three-electrode configuration are built combining conductive textiles and elastomeric layers, and distributed around knee and ankle...
October 12, 2017: Sensors
https://www.readbyqxmd.com/read/28989338/chemical-sensing-systems-that-utilize-soft-electronics-on-thin-elastomeric-substrates-with-open-cellular-designs
#14
Yoon Kyeung Lee, Kyung-In Jang, Yinji Ma, Ahyeon Koh, Hang Chen, Han Na Jung, Yerim Kim, Jean Won Kwak, Liang Wang, Yeguang Xue, Yiyuan Yang, Wenlong Tian, Yu Jiang, Yihui Zhang, Xue Feng, Yonggang Huang, John A Rogers
A collection of materials and device architectures are introduced for thin, stretchable arrays of ion sensors that mount on open cellular substrates to facilitate solution exchange for use in biointegrated electronics. The results include integration strategies and studies of fundamental characteristics in chemical sensing and mechanical response. The latter involves experimental measurements and theoretical simulations that establish important considerations in the design of low modulus, stretchable properties in cellular substrates, and in the realization of advanced capabilities in spatiotemporal mapping of chemicals' gradients...
March 3, 2017: Advanced Functional Materials
https://www.readbyqxmd.com/read/28983544/temperature-dependent-evolution-of-wrinkled-single-crystal-silicon-ribbons-on-shape-memory-polymers
#15
Yu Wang, Kai Yu, H Jerry Qi, Jianliang Xiao
Shape memory polymers (SMPs) can remember two or more distinct shapes, and thus can have a lot of potential applications. This paper presents combined experimental and theoretical studies on the wrinkling of single-crystal Si ribbons on SMPs and the temperature dependent evolution. Using the shape memory effect of heat responsive SMPs, this study provides a method to build wavy forms of single-crystal silicon thin films on top of SMP substrates. Silicon ribbons obtained from a Si-on-insulator (SOI) wafer are released and transferred onto the surface of programmed SMPs...
October 25, 2017: Soft Matter
https://www.readbyqxmd.com/read/28977713/surface-embedded-stretchable-electrodes-by-direct-printing-and-their-uses-to-fabricate-ultrathin-vibration-sensors-and-circuits-for-3d-structures
#16
Jun Hyuk Song, Young-Tae Kim, Sunghwan Cho, Woo-Jin Song, Sungmin Moon, Chan-Gyung Park, Soojin Park, Jae Min Myoung, Unyong Jeong
Printing is one of the easy and quick ways to make a stretchable wearable electronics. Conventional printing methods deposit conductive materials "on" or "inside" a rubber substrate. The conductors made by such printing methods cannot be used as device electrodes because of the large surface topology, poor stretchability, or weak adhesion between the substrate and the conducting material. Here, a method is presented by which conductive materials are printed in the way of being surface-embedded in the rubber substrate; hence, the conductors can be widely used as device electrodes and circuits...
October 4, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28975784/dual-mode-electronic-skin-with-integrated-tactile-sensing-and-visualized-injury-warning
#17
Yanli Zhang, Yunsheng Fang, Jia Li, Qihao Zhou, Yongjun Xiao, Kui Zhang, Beibei Luo, Jun Zhou, Bin Hu
Mimicking the pressure-sensing behavior of biological skins using electronic devices has profound implications for prosthetics and medicine. The developed electronic skins based on single response mode for pressure sensing suffer from a rapid decrease in sensitivity with the increase of pressure. Their highly sensitive range covers a narrow part of tolerable pressure range of the human skin and has a weak response to the injurious high pressures. Herein, inspired by a bioluminescent jellyfish, we develop an electronic skin with dual-mode response characteristics, which is able to quantify and map the static and dynamic pressures by combining electrical and optical responses...
October 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28972941/flexible-and-stretchable-microbial-fuel-cells-with-modified-conductive-and-hydrophilic-textile
#18
Sumiao Pang, Yang Gao, Seokheun Choi
We built a flexible, stretchable microbial fuel cell (MFC) by laminating two functional components: a bioanode textile with a conductive and hydrophilic polymer coating and a solid-state cathode textile loaded with silver oxide. The textile MFC used Pseudomonas aeruginosa PAO1 as a biocatalyst to generate the maximum power and current density of 1.0µW/cm(2) and 6.3µA/cm(2), respectively, which are comparable with or even higher than other flexible MFCs such as paper-based devices (~ a few µW/cm(2)). Additionally, the textile MFC generated consistent power even with repeated 70 cycles of 50% stretching...
September 28, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28970775/engineered-elastomer-substrates-for-guided-assembly-of-complex-3d-mesostructures-by-spatially-nonuniform-compressive-buckling
#19
Kewang Nan, Haiwen Luan, Zheng Yan, Xin Ning, Yiqi Wang, Ao Wang, Juntong Wang, Mengdi Han, Matthew Chang, Kan Li, Yutong Zhang, Wen Huang, Yeguang Xue, Yonggang Huang, Yihui Zhang, John A Rogers
Approaches capable of creating three-dimensional (3D) mesostructures in advanced materials (device-grade semiconductors, electroactive polymers etc.) are of increasing interest in modern materials research. A versatile set of approaches exploits transformation of planar precursors into 3D architectures through the action of compressive forces associated with release of prestrain in a supporting elastomer substrate. Although a diverse set of 3D structures can be realized in nearly any class of material in this way, all previously reported demonstrations lack the ability to vary the degree of compression imparted to different regions of the 2D precursor, thus constraining the diversity of 3D geometries...
January 5, 2017: Advanced Functional Materials
https://www.readbyqxmd.com/read/28970501/self-heating-induced-deterioration-of-electromechanical-performance-in-polymer-supported-metal-films-for-flexible-electronics
#20
Dong-Won Jang, Jeong-Hwan Lee, Ansoon Kim, Soon-Bok Lee, Seong-Gu Hong
The retention of electrical performance under the combined conditions of mechanical strain and an electrical current is essential for flexible electronics. Here, we report that even below the critical current density required for electromigration, the electrical current can significantly deteriorate the electromechanical performance of metal film/polymer substrate systems. This leads to a loss of stretchability, and this effect becomes more severe with increasing strain as well as increasing current. The local increase of electrical resistance in the metal film caused by damage, such as localized deformations, cracks, etc...
October 2, 2017: Scientific Reports
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