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stretchable electronics

Feng Wu, Songyue Chen, Baiyi Chen, Miao Wang, Lingli Min, Jack Alvarenga, Jie Ju, Ali Khademhosseini, Yuxing Yao, Yu Shrike Zhang, Joanna Aizenberg, Xu Hou
Flexible and stretchable microscale fluidic devices have a broad range of potential applications, ranging from electronic wearable devices for convenient digital lifestyle to biomedical devices. However, simple ways to achieve stable flexible and stretchable fluidic microchannels with dynamic liquid transport have been challenging because every application for elastomeric microchannels is restricted by their complex fabrication process and limited material selection. Here, a universal strategy for building microfluidic devices that possess exceptionally stable and stretching properties is shown...
January 11, 2018: Small
Song Chen, Haizhou Liu, Shuqi Liu, Pingping Wang, Songshan Zeng, Luyi Sun, Lan Liu
Ionic liquids (ILs) are regarded as ideal components in the next generation of strain sensors because their ultralow modulus can commendably circumvent or manage the mechanical mismatch in traditional strain sensors. In addition to strain sensors, stretchable conductors with strain-insensitive conductance are also indispensable in artificial systems for connecting and transporting electrons, similar to the function of blood vessels in the human body. In this work, two types of ILs-based conductive fibers were fabricated by developing hollow fibers with specific micro-scale channels which were then filled with ILs...
January 10, 2018: ACS Applied Materials & Interfaces
Ruiyuan Liu, Xiao Kuang, Jianan Deng, Yi-Cheng Wang, Aurelia C Wang, Wenbo Ding, Ying-Chih Lai, Jun Chen, Peihong Wang, Zhiqun Lin, H Jerry Qi, Baoquan Sun, Zhong Lin Wang
Growing demand in portable electronics raises a requirement to electronic devices being stretchable, deformable, and durable, for which functional polymers are ideal choices of materials. Here, the first transformable smart energy harvester and self-powered mechanosensation sensor using shape memory polymers is demonstrated. The device is based on the mechanism of a flexible triboelectric nanogenerator using the thermally triggered shape transformation of organic materials for effectively harvesting mechanical energy...
January 10, 2018: Advanced Materials
Jay M Taylor, Karla Perez-Toralla, Ruby Aispuro, Stephen A Morin
The lamination of mechanically stiff structures to elastic materials is prevalent in biological systems and popular in many emerging synthetic systems, such as soft robotics, microfluidics, stretchable electronics, and pop-up assemblies. The disparate mechanical and chemical properties of these materials have made it challenging to develop universal synthetic procedures capable of reliably adhering to these classes of materials together. Herein, a simple and scalable procedure is described that is capable of covalently laminating a variety of commodity ("off-the-shelf") thermoplastic sheets to silicone rubber films...
January 8, 2018: Advanced Materials
Hsing-Hua Hsieh, Fang-Chi Hsu, Yang-Fang Chen
Self-powered tactile sensing is the upcoming technological orientation for developing compact, robust, and energy-saving devices in human-machine interfacing and electronic skin. Here, we report an intriguing type of sensing device composed of a Pt crack-based sensor in series with a polymer solar cell as a building block for energetically autonomous, wearable, and tactile sensor. This coplanar device enables human activity and physiological monitoring under indoor light illumination (2 mW/cm2) with acceptable and readible output signals...
January 4, 2018: ACS Sensors
Zhou Chen, Weiqiu Chen, Jizhou Song
The buckling of a stiff film on a compliant substrate has attracted much attention due to its wide applications such as thin-film metrology, surface patterning and stretchable electronics. An analytical model is established for the buckling of a stiff thin film on a semi-infinite elastic graded compliant substrate subjected to in-plane compression. The critical compressive strain and buckling wavelength for the sinusoidal mode are obtained analytically for the case with the substrate modulus decaying exponentially...
December 2017: Proceedings. Mathematical, Physical, and Engineering Sciences
Sungwoo Jang, Choelgyu Kim, Jung Jin Park, Ming Liang Jin, Seon Joon Kim, O Ok Park, Taek-Soo Kim, Hee-Tae Jung
The development of strain-insensitive stretchable transparent conductors (TCs) is essential for manufacturing stretchable electronics. Despite recent progress, achieving a high optoelectronic performance under applied strain of 50% continues to present a significant challenge in this research field. Herein, an ultratall and ultrathin high aspect ratio serpentine metal structure is described that exhibits a remarkable stretching ability (the resistance remains constant under applied strain of 100%) and simultaneously provides an excellent transparent conducting performance (with a sheet resistance of 7...
December 27, 2017: Small
Ying Lu, Jianwei Jiang, Sungho Yoon, Kyung-Shik Kim, Jae-Hyun Kim, Sanghyuk Park, Sang-Ho Kim, Longhai Piao
Highly stretchable and conductive fibers have attracted great interest as a fundamental building block for the next generation of textile-based electronics. Because of its high conductivity and high aspect ratio, Ag nanowire (AgNW) has been considered one of the most promising conducting materials for the percolation-network-based conductive films and composites. However, the poor dispersibility of AgNWs in hydrophobic polymers has hindered its applica-tion to stretchable conductive composite fibers. In this paper, we present a highly stretchable and conductive compo-site fiber from the co-spinning of elastic polyurethane (PU) and surface modified AgNWs...
December 26, 2017: ACS Applied Materials & Interfaces
Fan Xu, Michel Potier-Ferry
A basic characteristic of stiff film/soft substrate systems is their ability to experience large deformation under compressive stresses, which inevitably leads to formation of patterns on the surface. Such pattern formation is the result of loss of stability and symmetry breaking. Knowledge on how such instabilities arise and evolve is essential to describe, understand, predict, and ultimately to design complex functional materials and structures, for example the fabrication of stretchable electronic devices and micro/nano-scale surface patterning control...
December 22, 2017: Scientific Reports
Tae Gon Kim, Hye Jin Park, Kyoohee Woo, Sunho Jeong, Youngmin Choi, Su Yeon Lee
Conductive metallic nanomaterials applicable to low-cost and scalable methods have attracted great attention. Among these, Cu-based electrodes appear promising for flexible and stretchable electronic devices. However, Cu nanoparticle (NP)-based electrodes are inherently sensitive to oxygen and moisture, which hinder their practical applications. In this work, fabrication and application of highly conductive, robust, flexible, and oxidation-resistant Cu-Ni core-shell NP-based electrodes have been reported. Cu@Ni core-shell NPs with a tunable Ni shell thickness were synthesized by varying the Cu/Ni molar ratios in the precursor solution...
December 11, 2017: ACS Applied Materials & Interfaces
Hui-Ching Hsieh, Jung-Yao Chen, Wen-Ya Lee, Debaditya Bera, Wen-Chang Chen
Stretchable light-emitting polymers are important for wearable electronics; however, the development of intrinsic stretchable light-emitting materials with great performance under large applied strain is the most critical challenge. Herein, this study demonstrates the fabrication of stretchable fluorescent poly[(9,9-bis(3'-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctyl-fluorene)]/acrylonitrile butadiene rubber (PFN/NBR) blend nanofibers using the uniaxial electrospinning technique. The physical interaction of PFN with NBR and the geometrical confinement of nanofibers are employed to reduce PFN aggregation, leading to the high photoluminescence quantum yield of 35...
December 6, 2017: Macromolecular Rapid Communications
Qiang Zhang, Lihua Liu, Dong Zhao, Qianqian Duan, Jianlong Ji, Aoqun Jian, Wendong Zhang, Shengbo Sang
Due to the rapid development and superb performance of electronic skin, we propose a highly sensitive and stretchable temperature and strain sensor. Silver nanoparticles coated carbon nanowires (Ag@CNT) nanomaterials with different Ag concentrations were synthesized. After the morphology and components of the nanomaterials were demonstrated, the sensors composed of Polydimethylsiloxane (PDMS) and CNTs or Ag@CNTs were prepared via a simple template method. Then, the electronic properties and piezoresistive effects of the sensors were tested...
December 4, 2017: Nanomaterials
Jaehyun Han, Jun-Young Lee, Jihye Lee, Jong-Souk Yeo
A highly stretchable and reliable, transparent and conductive entangled graphene mesh network (EGMN) exhibits an interconnected percolation network, as usually shown in 1D nanowires, but with the electrical, mechanical, and thermal properties of 2D graphene. The unique combination of the 2D material properties and the network structure of wrinkled, waved, and crumpled graphene enables the EGMN to demonstrate excellent electrical reliability, mechanical durability, and thermal stability, even under harsh environmental and external conditions such as very high temperature, humidity, bending, and stretching...
December 4, 2017: Advanced Materials
Dong Hae Ho, Ryun Geun Song, Qijun Sun, Won-Hyeong Park, So Young Kim, Changhyun Pang, Do Hwan Kim, Sang-Youn Kim, Jinkee Lee, Jeong Ho Cho
We reported the development of a transparent stretchable crack-enhanced microfluidic capacitive sensor array for use in E-skin applications. The microfluidic sensor was fabricated through a simple lamination process involving two silver nanowire (AgNW)-embedded rubbery microfluidic channels arranged in a crisscross fashion. The sensing performance was optimized by testing a variety of sensing liquids injected into the channels. External mechanical stimuli applied to the sensor induced the liquid to penetrate the deformed micro cracks on the rubber channel surface...
December 5, 2017: ACS Applied Materials & Interfaces
Zhaoguo Xue, Mei Sun, Taige Dong, Zhiqiang Tang, Yaolong Zhao, Junzhuan Wang, Xianlong Wei, Linwei Yu, Qing Chen, Jun Xu, Yi Shi, Kunji Chen, Pere Roca I Cabarrocas
Line-shape engineering is a key strategy to endow extra flexibility and stretchability to 1D silicon nanowires (SiNWs) grown with self-assembly processes. We here demonstrate a deterministic line-shape programming of in-plane SiNWs into extremely stretchable springs or arbitrary 2D patterns, with the aid of indium droplets that absorb amorphous Si precursor thin film to produce ultra-long c-Si NWs along programmed step edges. A reliable and faithful single run growth of c-SiNWs over turning tracks with different local curvatures has been well established, while high resolution transmission electron microscopy analysis reveals a high quality mono-like crystallinity in the line-shaped engineered SiNW springs...
November 30, 2017: Nano Letters
Jinwook Jung, Habeom Lee, Inho Ha, Hyunmin Cho, Kyun Kyu Kim, Jinhyeong Kwon, Phillip Won, Sukjoon Hong, Seung Hwan Ko
Future electronics are expected to develop into wearable forms and an adequate stretchability is required for the forthcoming wearable electronics considering various motions occurring in human body. Along with stretchability, transparency can increase both the functionality and esthetic features in future wearable electronics. In this paper, we demonstrate, for the first time, a highly stretchable and transparent electromagnetic interference (EMI) shielding layer for wearable electronic applications with silver nanowire percolation network on elastic PDMS substrate...
November 30, 2017: ACS Applied Materials & Interfaces
Bing Xiong, Weibing Zhong, Qing Zhu, Ke Liu, Mufang Li, Gang Sun, Dong Wang
The development of electronics towards a more functions-integrated, flexible and stretchable direction requires mechanically flexible substrates with high thermal and dimensional stability and optical transparency. Herein, rolls of an optically transparent PVA-co-PE nanofibrous membrane/epoxy composite with synergistically enhanced thermal stability, very low CTE, and outstanding mechanical properties are reported. The nanoscale size, the unique inter-stack structure, and the strong interfacial interactions between the PVA-co-PE nanofibers and the epoxy contribute to the synergistic effects...
November 30, 2017: Nanoscale
Qiuting Zhang, Yichao Tang, Maryam Hajfathalian, Chunxu Chen, Kevin T Turner, Dmitriy A Dikin, Gaojian Lin, Jie Yin
Design of electronic materials with high stretchability is of great importance for realizing soft and conformal electronics. One strategy of realizing stretchable metals and semiconductors is to exploit the buckling of materials bonded to elastomers. However, the level of stretchability is often limited by the cracking and fragmentation of the materials that occurs when constrained buckling occurs while bonded to the substrate. Here, we exploit a failure mechanism, spontaneous buckling-driven periodic delamination, to achieve high stretchability in metal and silicon films that are deposited on pre-strained elastomer substrates...
November 28, 2017: ACS Applied Materials & Interfaces
Po-Yen Chen, Mengke Zhang, Muchun Liu, Ian Y Wong, Robert H Hurt
A wide range of technologies require barrier films to impede molecular transport between the external environment and a desired internal microclimate. Adding stretchability to barrier films would enable new applications in packaging, textiles, and flexible devices, but classical barrier materials utilized dense, ordered molecular architectures that easily fracture under small tensile strain. Here, we show that textured graphene-based coatings can serve as ultra-stretchable molecular barriers expandable to 1500% areal strain through programmed unfolding that mimics the elasticity of polymers...
November 22, 2017: ACS Nano
La Li, Zheng Lou, Di Chen, Kai Jiang, Wei Han, Guozhen Shen
The popularization of personalized wearable devices has accelerated the development of flexible/stretchable supercapacitors (SCs) that possess remarkable features of miniaturization, high security, and easy integration to build an all-in-one integrated system, and realize the functions of comfortable, noninvasive and continuous health monitoring, motion records, and information acquisition, etc. This Review presents a brief phylogeny of flexible/stretchable SCs, represented by planar micro-supercapacitors (MSCs) and 1D fibrous SCs...
November 22, 2017: Small
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