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stretchable electronics

Chunhui Wu, Jinting Jiu, Teppei Araki, Hirotaka Koga, Tsuyoshi Sekitani, Hao Wang, Katsuaki Suganuma
A biaxially wave-shaped polydimethylsiloxane (PDMS) surface was developed simply by using a taro leaf as the template. The resulting leaf-templated PDMS (L-PDMS) possesses a micro-sized curved interface structure, which is greatly beneficial for the exact embedding of a silver nanowire (AgNW) network conductive film covering the L-PDMS surface. The intrinsically curved AgNW/L-PDMS film surface, without any dangling nanowire, could prevent the fracture of AgNWs due to stretching stress even after cyclic stretching...
January 6, 2017: Nanotechnology
Ahyeon Koh, Daeshik Kang, Yeguang Xue, Seungmin Lee, Rafal M Pielak, Jeonghyun Kim, Taehwan Hwang, Seunghwan Min, Anthony Banks, Philippe Bastien, Megan C Manco, Liang Wang, Kaitlyn R Ammann, Kyung-In Jang, Phillip Won, Seungyong Han, Roozbeh Ghaffari, Ungyu Paik, Marvin J Slepian, Guive Balooch, Yonggang Huang, John A Rogers
Capabilities in health monitoring enabled by capture and quantitative chemical analysis of sweat could complement, or potentially obviate the need for, approaches based on sporadic assessment of blood samples. Established sweat monitoring technologies use simple fabric swatches and are limited to basic analysis in controlled laboratory or hospital settings. We present a collection of materials and device designs for soft, flexible, and stretchable microfluidic systems, including embodiments that integrate wireless communication electronics, which can intimately and robustly bond to the surface of the skin without chemical and mechanical irritation...
November 23, 2016: Science Translational Medicine
Ying Zhou, Reiko Azumi
Developments in the manufacturing technology of low-cost, high-quality carbon nanotubes (CNTs) are leading to increased industrial applications for this remarkable material. One of the most promising applications, CNT based transparent conductive films (TCFs), are an alternative technology in future electronics to replace traditional TCFs, which use indium tin oxide. Despite significant price competition among various TCFs, CNT-based TCFs have good potential for use in emerging flexible, stretchable and wearable optoelectronics...
2016: Science and Technology of Advanced Materials
You Jun Fan, Xian Song Meng, Hua Yang Li, Shuang Yang Kuang, Lei Zhang, Ying Wu, Zhong Lin Wang, Guang Zhu
A stretchable porous nanocomposite (PNC) is reported based on a hybrid of a multiwalled carbon nanotubes network and a polydimethylsiloxane matrix for harvesting energy from mechanical interactions. The deformation-enabled energy-generating process makes the PNC applicable to various mechanical interactions, including pressing, stretching, bending, and twisting. It can be potentially used as an energy solution for wearable electronics.
November 21, 2016: Advanced Materials
Tran Quang Trung, Nae-Eung Lee
Stretchable electronic devices with intrinsically stretchable components have significant inherent advantages, including simple fabrication processes, a high integrity of the stacked layers, and low cost in comparison with stretchable electronic devices based on non-stretchable components. The research in this field has focused on developing new intrinsically stretchable components for conductors, semiconductors, and insulators. New methodologies and fabrication processes have been developed to fabricate stretchable devices with intrinsically stretchable components...
November 14, 2016: Advanced Materials
Jin Young Oh, Simon Rondeau-Gagné, Yu-Cheng Chiu, Alex Chortos, Franziska Lissel, Ging-Ji Nathan Wang, Bob C Schroeder, Tadanori Kurosawa, Jeffrey Lopez, Toru Katsumata, Jie Xu, Chenxin Zhu, Xiaodan Gu, Won-Gyu Bae, Yeongin Kim, Lihua Jin, Jong Won Chung, Jeffrey B-H Tok, Zhenan Bao
Thin-film field-effect transistors are essential elements of stretchable electronic devices for wearable electronics. All of the materials and components of such transistors need to be stretchable and mechanically robust. Although there has been recent progress towards stretchable conductors, the realization of stretchable semiconductors has focused mainly on strain-accommodating engineering of materials, or blending of nanofibres or nanowires into elastomers. An alternative approach relies on using semiconductors that are intrinsically stretchable, so that they can be fabricated using standard processing methods...
November 16, 2016: Nature
Zhiyuan Liu, Xiaotian Wang, Dianpeng Qi, Cai Xu, Jiancan Yu, Yaqing Liu, Ying Jiang, Bo Liedberg, Xiaodong Chen
High-adhesion stretchable electrodes are fabricated by utilizing a novel nanopile interlocking strategy. Nanopiles significantly enhance adhesion and redistribute the strain in the film, achieving high stretchability. The nanopile electrodes enable simultaneous monitoring of electromyography signals and mechanical deformations. This study opens up a new perspective of achieving stretchability and high adhesion for stretchable electronics.
November 3, 2016: Advanced Materials
Da Yin, Jing Feng, Nairong Jiang, Rui Ma, Yuefeng Liu, Hong-Bo Sun
Stretchable organic light-emitting devices (SOLEDs) with two-dimensional (2D) stretchability are superior to one-dimensional (1D) SOLEDs in most practical applications such as wearable electronics and electronic skins and therefore attract a great deal of interest. However, the luminous efficiency of the 2D SOLEDs is still not practical for the purposes of commercial applications. This is due to the limitations on materials and structures from the physical and electrical damage caused by the complicated interactions of the anisotropic stress in 2D stretchable system...
October 28, 2016: ACS Applied Materials & Interfaces
Ho Young Kim, Jae-Won Lee, Hye Min Oh, Kang-Jun Baeg, Sunshin Jung, Ho-Soon Yang, Wonki Lee, Jun Yeon Hwang, Keun Soo Kim, Seung Yol Jeong, Joong Tark Han, Mun Seok Jeong, Geon-Woong Lee, Hee Jin Jeong
Despite recent progress in producing flexible and stretchable electronics based on two-dimensional (2D) nanosheets, their intrinsic properties are often degraded by the presence of polymeric residues that remain attached to the 2D nanosheet surfaces following fabrication. Further breakthroughs are therefore keenly awaited to obtain clean surfaces compatible with flexible applications. Here, we report a method that allows the 2D nanosheets to be intrinsically integrated onto flexible substrates. The method involves thermal decomposition of polymeric residues by microwave-induced ultrafast heating of the surface without affecting the underlying flexible substrate...
November 1, 2016: ACS Applied Materials & Interfaces
Huan Wang, Mayue Shi, Kai Zhu, Zongming Su, Xiaoliang Cheng, Yu Song, Xuexian Chen, Zhiqiang Liao, Min Zhang, Haixia Zhang
As the essential element of a triboelectric nanogenerator (TENG), friction layers play key roles that determine the device performance, which can be enhanced by material selection and surface modification. In this work, we have embedded aligned carbon nanotubes (CNTs) on the polydimethylsiloxane (PDMS) surface as the effective dielectric layer to donate electrons. This layer not only increases the electron generation for the output, but also shows notable stretchability. The length and the properties of the aligned CNTs can be controlled precisely...
October 25, 2016: Nanoscale
Zheng Lou, Guozhen Shen
Flexible photodetectors with excellent flexibility, high mechanical stability and good detectivity, have attracted great research interest in recent years. 1D inorganic nanostructures provide a number of opportunities and capabilities for use in flexible photodetectors as they have unique geometry, good transparency, outstanding mechanical flexibility, and excellent electronic/optoelectronic properties. This article offers a comprehensive review of several types of flexible photodetectors based on 1D nanostructures from the past ten years, including flexible ultraviolet, visible, and infrared photodetectors...
June 2016: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Hyeon Jun Sim, Changsoon Choi, Shi Hyeong Kim, Kang Min Kim, Chang Jun Lee, Youn Tae Kim, Xavier Lepró, Ray H Baughman, Seon Jeong Kim
Stretchable fiber and yarn triboelectric nanogenerator are sought for such applications as wearable sensing system such as cloth communication devices, electronic textiles, and robotic sensory skin. Unfortunately, previously reported triboelectric fiber and yarn are difficult to have stretchable property. We introduce here a new type of stretchable and weavable triboelectric fibers with microdiameter dimensions. The stretchable triboelectric fibers can be reversibly stretched up to 50% in tensile direction while generating voltage output proportional to the applied tensile strain...
October 11, 2016: Scientific Reports
S-Y Kim, K Kim, Y H Hwang, J Park, J Jang, Y Nam, Y Kang, M Kim, H J Park, Z Lee, J Choi, Y Kim, S Jeong, B-S Bae, J-U Park
As demands for high pixel densities and wearable forms of displays increase, high-resolution printing technologies to achieve high performance transistors beyond current amorphous silicon levels and to allow low-temperature solution processability for plastic substrates have been explored as key processes in emerging flexible electronics. This study describes electrohydrodynamic inkjet (e-jet) technology for direct printing of oxide semiconductor thin film transistors (TFTs) with high resolution (minimum line width: 2 μm) and superb performance, including high mobility (∼230 cm(2) V(-1) s(-1))...
October 6, 2016: Nanoscale
Sha-Sha Wang, Hui-Biao Liu, Xiao-Nan Kan, Li Wang, Yan-Huan Chen, Bin Su, Yu-Liang Li, Lei Jiang
As a new member of carbon allotropes, graphdiyne is a promising material with excellent electronic performance and high elasticity, indicating the possibility of graphdiyne to serve as the building blocks in flexible electronics. However, precise positioning/patterning of graphdiyne is still a challenge for the realization of large-area and flexible organic electronic devices and circuits. Here, the direct in situ synthesis of patterning graphdiyne stripe arrays dominated by the superlyophilic grooved templates is reported, whereas the superlyophilicity of grooved templates plays a key role in allowing continuous mass transport of raw reactants into the microscale spacing...
October 7, 2016: Small
Naveen N Jason, Stephen J Wang, Sushrut Bhanushali, Wenlong Cheng
This work demonstrates a facile "paint-on" approach to fabricate highly stretchable and highly sensitive strain sensors by combining one-dimensional copper nanowire networks with two-dimensional graphite microflakes. This paint-on approach allows for the fabrication of electronic skin (e-skin) patches which can directly replicate with high fidelity the human skin surface they are on, regardless of the topological complexity. This leads to high accuracy for detecting biometric signals for applications in personalised wearable sensors...
September 22, 2016: Nanoscale
Zhichao Fan, Yihui Zhang, Qiang Ma, Fan Zhang, Haoran Fu, Keh-Chih Hwang, Yonggang Huang
Lithographically defined interconnects with filamentary, serpentine configurations have been widely used in various forms of stretchable electronic devices, owing to the ultra-high stretchability that can be achieved and the relative simple geometry that facilitates the design and fabrication. Theoretical models of serpentine interconnects developed previously for predicting the performance of stretchability were mainly based on the theory of infinitesimal deformation. This assumption, however, does not hold for the interconnects that undergo large levels of deformations before the structural failure...
August 2016: International Journal of Solids and Structures
Cancan Xu, Yihui Huang, Gerardo Yepez, Zi Wei, Fuqiang Liu, Alejandro Bugarin, Liping Tang, Yi Hong
Conductive biodegradable materials are of great interest for various biomedical applications, such as tissue repair and bioelectronics. They generally consist of multiple components, including biodegradable polymer/non-degradable conductive polymer/dopant, biodegradable conductive polymer/dopant or biodegradable polymer/non-degradable inorganic additives. The dopants or additives induce material instability that can be complex and possibly toxic. Material softness and elasticity are also highly expected for soft tissue repair and soft electronics...
September 30, 2016: Scientific Reports
Jin-Yong Hong, Wook Kim, Dukhyun Choi, Jing Kong, Ho Seok Park
Stretchable and transparent electrodes have been developed for applications in flexible and wearable electronics. For customer-oriented practical applications, the electrical and optical properties of stretchable electrodes should be independent of the directions of the applied stress, and such electrodes are called omnidirectionally stretchable electrodes. Herein, we report a simple and cost-effective approach for the fabrication of omnidirectionally stretchable and transparent graphene electrodes with mechanical durability and performance reliability...
October 4, 2016: ACS Nano
Ying-Chih Lai, Jianan Deng, Simiao Niu, Wenbo Peng, Changsheng Wu, Ruiyuan Liu, Zhen Wen, Zhong Lin Wang
Electric eel-skin-inspired mechanically durable and super-stretchable nanogenerator is demonstrated for the first time by using triboelectric effect. This newly designed nanogenerator can produce electricity by touch or tapping despite under various extreme mechanical deformations or even after experiencing damage. This device can be used not only as deformable and wearable power source but also as fully autonomous and self-sufficient adaptive electronic skin system.
December 2016: Advanced Materials
Jie Wang, Shengming Li, Fang Yi, Yunlong Zi, Jun Lin, Xiaofeng Wang, Youlong Xu, Zhong Lin Wang
Harvesting biomechanical energy is an important route for providing electricity to sustainably drive wearable electronics, which currently still use batteries and therefore need to be charged or replaced/disposed frequently. Here we report an approach that can continuously power wearable electronics only by human motion, realized through a triboelectric nanogenerator (TENG) with optimized materials and structural design. Fabricated by elastomeric materials and a helix inner electrode sticking on a tube with the dielectric layer and outer electrode, the TENG has desirable features including flexibility, stretchability, isotropy, weavability, water-resistance and a high surface charge density of 250 μC m(-2)...
2016: Nature Communications
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