共查询到20条相似文献，搜索用时 12 毫秒
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Yuya Nishio Jun Hirotani Shigeru Kishimoto Hiromichi Kataura Yutaka Ohno 《Advanced Electronic Materials》2021,7(1):2000674
Stretchable devices, which can intimately contact dynamic free-form surfaces, show great promise for wearable and implantable devices for human beings and multifunctional electronic skins for soft robotics. Although some successful stretchable devices have been reported, there are still remaining issues; in particular, the fundamental requirements for wearable devices, including low-voltage operation, operation speed, mechanical stretchability and robustness, and easy circuit design, are needed to be satisfied simultaneously. Here, a local strain suppression layer (L-SSL) is introduced into all-carbon nanotube (CNT) stretchable thin-film transistors (TFTs) and integrated circuits (ICs) to address these issues. The L-SSL, which has a high Young's modulus, is placed on top of the active channel region to suppress the induced local strain. The resulting CNT TFTs show no drain current degradation under externally applied tensile strain of up to 35%. Furthermore, stretchable all-CNT ICs, such as inverters and ring oscillators, can operate at low supply voltage as 0.7 V, because high-k material can be used underneath the L-SSL. Biaxial stretching, an indispensable ability for wearable devices on 3D deformable surfaces such as the human body, is also achieved. The all-CNT devices, equipped with an L-SSL, demonstrate potential for strain-insensitive stretchable devices with low-voltage operation. 相似文献
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Teddy Salim Hang‐Woo Lee Lydia Helena Wong Zhenan Bao Yeng Ming Lam 《Advanced functional materials》2016,26(1):51-65
The effects of the incorporation of semiconducting single‐walled nanotubes (sc‐SWNTs) with high purity on the bulk heterojunction (BHJ) organic solar cell (OSC) based on regioregular poly(3‐hexylthiophene‐2,5‐diyl):[6,6]‐phenyl‐C61‐butyric acid methyl ester (rr‐P3HT:PCBM) are reported for the first time. The sc‐SWNTs induce the organization of the polymer phase, which is evident from the increase in crystallite size, the red‐shifted absorption characteristics and the enhanced hole mobility. By incorporating sc‐SWNTs, OSC with a power conversion efficiency (PCE) as high as 4% can be achieved, which is ≈8% higher than our best control device. A novel application of sc‐SWNTs in improving the thermal stability of BHJ OSCs is also demonstrated. After heating at 150 °C for 9 h, it is observed that the thermal stability of rr‐P3HT:PCBM devices improves by more than fivefold with inclusion of sc‐SWNTs. The thermal stability enhancement is attributed to a more suppressed phase separation, as shown by the remarkable decrease in the formation of sizeable crystals, which in turn can be the outcome of a more controlled crystallization of the blend materials on the nanotubes. 相似文献
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Hyunbum Kang Yeongjun Lee Gae Hwang Lee Jong Won Chung Young-Nam Kwon Joo-Young Kim Yasutaka Kuzumoto Sangah Gam Sung-Gyu Kang Ji Young Jung Ajeong Choi Youngjun Yun 《Advanced functional materials》2023,33(13):2212219
A skin-like photodiode (PD) that is stretchable and skin-conformable is crucial to opening the next-generation wearable electronics for optical biometric monitoring, biomedical imaging, and others. To achieve reliable PD characteristics under large deformation, stretchable PDs with high detectivity and high mechanical stretchability must be developed. Herein, intrinsically stretchable polymer-based PDs (is-PPDs) comprising all-polymeric constituent layers are demonstrated. In particular, elastomeric photoactive layers consisting of an elastomer with p-/n-type semiconducting polymers and conducting polymer-based stretchable transparent electrodes with modulated work functions improve both the mechanical stability and the detectivity (D*) of is-PPDs. Accordingly, is-PPDs show excellent D* over 1013 Jones with a suppressed dark current density of 0.1 nA cm−2 before and after 100% stretching. The proposed is-PPDs record high-quality and stable photoplethysmography signals at the wrist with outward extension. 相似文献
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Highly conductive and stretchable fibers are crucial components of wearable electronics systems. Excellent electrical conductivity, stretchability, and wearability are required from such fibers. Existing technologies still display limited performances in these design requirements. Here, achieving highly stretchable and sensitive strain sensors by using a coaxial structure, prepared via coaxial wet spinning of thermoplastic elastomer‐wrapped carbon nanotube fibers, is proposed. The sensors attain high sensitivity (with a gauge factor of 425 at 100% strain), high stretchability, and high linearity. They are also reproducible and durable. Their use as safe sensing components on deformable cable, expandable surfaces, and wearable textiles is demonstrated. 相似文献
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Jia‐Qi Huang Xin‐Yan Liu Dai‐Wei Wang Xin‐Bing Cheng Qiang Zhang 《Advanced functional materials》2014,24(39):6105-6112
The rational combination of conductive nanocarbon with sulfur leads to the formation of composite cathodes that can take full advantage of each building block; this is an effective way to construct cathode materials for lithium–sulfur (Li–S) batteries with high energy density. Generally, the areal sulfur‐loading amount is less than 2.0 mg cm?2, resulting in a low areal capacity far below the acceptable value for practical applications. In this contribution, a hierarchical free‐standing carbon nanotube (CNT)‐S paper electrode with an ultrahigh sulfur‐loading of 6.3 mg cm?2 is fabricated using a facile bottom–up strategy. In the CNT–S paper electrode, short multi‐walled CNTs are employed as the short‐range electrical conductive framework for sulfur accommodation, while the super‐long CNTs serve as both the long‐range conductive network and the intercrossed mechanical scaffold. An initial discharge capacity of 6.2 mA·h cm?2 (995 mA·h g?1), a 60% utilization of sulfur, and a slow cyclic fading rate of 0.20%/cycle within the initial 150 cycles at a low current density of 0.05 C are achieved. The areal capacity can be further increased to 15.1 mA·h cm?2 by stacking three CNT–S paper electrodes—resulting in an areal sulfur‐loading of 17.3 mg cm?2—for the cathode of a Li–S cell. The as‐obtained free‐standing paper electrode are of low cost and provide high energy density, making them promising for flexible electronic devices based on Li–S batteries. 相似文献
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Electrodes: Hierarchical Free‐Standing Carbon‐Nanotube Paper Electrodes with Ultrahigh Sulfur‐Loading for Lithium–Sulfur Batteries (Adv. Funct. Mater. 39/2014) 
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下载免费PDF全文 Zhe Yuan Hong‐Jie Peng Jia‐Qi Huang Xin‐Yan Liu Dai‐Wei Wang Xin‐Bing Cheng Qiang Zhang 《Advanced functional materials》2014,24(39):6244-6244
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Sumin Lim Donghee Son Jaemin Kim Young Bum Lee Jun‐Kyul Song Suji Choi Dong Jun Lee Ji Hoon Kim Minbaek Lee Taeghwan Hyeon Dae‐Hyeong Kim 《Advanced functional materials》2015,25(3):375-383
An interactive human‐machine interface (iHMI) enables humans to control hardware and collect feedback information. In particular, wearable iHMI systems have attracted tremendous attention owing to their potential for use in personal mobile electronics and the Internet of Things. Although significant progress has been made in the development of iHMI systems, those based on rigid electronics have constraints in terms of wearability, comfortability, signal‐to‐noise ratio (SNR), and aesthetics. Herein the fabrication of a transparent and stretchable iHMI system composed of wearable mechanical sensors and stimulators is reported. The ultrathin and lightweight design of the system allows superior wearability and high SNR. The use of conductive/piezoelectric graphene heterostructures, which consist of poly(l ‐lactic acid), single‐walled carbon nanotubes, and silver nanowires, results in high transparency, excellent performance, and low power consumption as well as mechanical deformability. The control of a robot arm for various motions and the feedback stimulation upon successful executions of commands are demonstrated using the wearable iHMI system. 相似文献
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Wearable Electronics: Transparent and Stretchable Interactive Human Machine Interface Based on Patterned Graphene Heterostructures (Adv. Funct. Mater. 3/2015) 下载免费PDF全文
下载免费PDF全文 Sumin Lim Donghee Son Jaemin Kim Young Bum Lee Jun‐Kyul Song Suji Choi Dong Jun Lee Ji Hoon Kim Minbaek Lee Taeghwan Hyeon Dae‐Hyeong Kim 《Advanced functional materials》2015,25(3):374-374
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Seungki Hong Jongsu Lee Kyungsik Do Minbaek Lee Ji Hoon Kim Sangkyu Lee Dae‐Hyeong Kim 《Advanced functional materials》2017,27(48)
Carbon nanotubes (CNTs) are a promising material for use as a flexible electrode in wearable energy devices due to their electrical conductivity, soft mechanical properties, electrochemical activity, and large surface area. However, their electrical resistance is higher than that of metals, and deformations such as stretching can lead to deterioration of electrical performances. To address these issues, here a novel stretchable electrode based on laterally combed CNT networks is presented. The increased percolation between combed CNTs provides a high electrical conductivity even under mechanical deformations. Additional nickel electroplating and serpentine electrode designs increase conductivity and deformability further. The resulting stretchable electrode exhibits an excellent sheet resistance, which is comparable to conventional metal film electrodes. The resistance change is minimal even when stretched by ≈100%. Such high conductivity and deformability in addition to intrinsic electrochemically active property of CNTs enable high performance stretchable energy harvesting (wireless charging coil and triboelectric generator) and storage (lithium ion battery and supercapacitor) devices. Monolithic integration of these devices forms a wearable energy supply system, successfully demonstrating its potential as a novel soft power supply module for wearable electronics. 相似文献
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Electronic applications that offer flexibility and stretchability have attracted increasing interest over the past few years because of their potential applications in, for example, electronic skin and bio‐inspired devices, where electronics based on current wafer‐based technology are not suitable. Metal‐oxide‐based binary and ternary systems offer the opportunity for large‐area uniform synthesis of materials with excellent electrical performance. This review mainly focuses on basic flexibility and stretchability concepts that can be integrated and applied to all inorganic‐material‐based electronic devices. Possible fabrication methods are also discussed, and oxide‐based electronic applications summarized in this context. Finally, the review is concluded with a discussion of future prospects of oxides in flexible and stretchable devices. 相似文献
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Chen Feng Kai Liu Jeah‐Sheng Wu Liang Liu Jia‐Shyong Cheng Yuying Zhang Yinghui Sun Qunqing Li Shoushan Fan Kaili Jiang 《Advanced functional materials》2010,20(6):885-891
A straightforward roll‐to‐roll process for fabricating flexible and stretchable superaligned carbon nanotube films as transparent conducting films is demonstrated. Practical touch panels assembled by using these carbon nanotube conducting films are superior in flexibility and wearability—and comparable in linearity—to touch panels based on indium tin oxide (ITO) films. After suitable laser trimming and deposition of Ni and Au metal, the carbon nanotube film possesses excellent performance with two typical values of sheet resistances and transmittances (208 Ω □?1, 90% and 24 Ω □?1, 83.4%), which are comparable to ITO films and better than the present carbon nanotube conducting films in literature. The results provide a route to produce transparent conducting films more easily, effectively, and cheaply, an important step for realizing industrial‐scale applications of carbon nanotubes for transparent conducting films. 相似文献
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Shang‐lin Gao Rong‐Chuan Zhuang Jie Zhang Jian‐Wen Liu Edith Mäder 《Advanced functional materials》2010,20(12):1885-1893
A simple approach to deposit multiwalled carbon nanotube (MWNT) networks onto glass fiber surfaces achieving semiconductive MWNT–glass fibers is reported, along with application of fiber/polymer interphases as in‐situ multifunctional sensors. This approach demonstrates for the first time that the techniques of conducting electrical resistance measurements could be applicable to glass fibers for in situ sensing of strain and damage; the techniques were previously limited to conductive and semiconductive materials. The electrical properties of the single MWNT–glass fiber and the “unidirectional” fiber/epoxy composite show linear or nonlinear stress/strain, temperature, and relative humidity dependencies, which are capable of detecting piezoresistive effects as well as the local glass transition temperature. The unidirectional composites containing MWNT–glass fibers exhibit ultrahigh anisotropic electrical properties and an ultralow electrical percolation threshold. Based on this approach, the glass fiber—the most widely used reinforcement in composites globally—along with the surface electrical conductivity of MWNTs will stimulate and realize a broad range of multifunctional applications. 相似文献
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Xinqin Liao Weitao Song Xiangyu Zhang Haoran Jin Siyu Liu Yongtian Wang Aaron Voon-Yew Thean Yuanjin Zheng 《Advanced functional materials》2021,31(24):2101107
Prostheses and robots have been affecting all aspects of life. Making them conscious and intelligent like humans is appealing and exciting, while there is a huge contrast between progress and strong demand. An alternative strategy is to develop an artificial peripheral neural system with high-performance bionic receptors. Here, a novel functional composite material that can serve as a key ingredient to simultaneously construct different artificial exteroceptive sensors (AE sensors) and artificial proprioceptive sensors (AP sensors) is demonstrated. Both AP sensors and AE sensors demonstrate outstandingly high stretchability; up to 200% stretching strain and possess the superior performance of fast response and high stability. An artificial peripheral neural system integrated with the highly stretchable AP sensor and AE sensor is constructed, which makes a significant breakthrough in the perception foundation of efficient proprioception and exteroception for intelligent prostheses and soft robots. Accurate feedback on the activities of body parts, music control, game manipulation, and wireless typing manifest the enormous superiority of the spatiotemporal resolution function of the artificial peripheral neural system, all of which powerfully contribute to promoting intelligent prostheses and soft robots into sophistication, and are expected to make lives more fascinating. 相似文献
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Xiaoqian Tong Tianyu Shan Qinqing Du Zhihang An Huiwen He Meng Ma Yanqin Shi Si Chen Xu Wang 《Advanced Electronic Materials》2019,5(8)
A stretchable, flexible electroresponsive liquid‐crystal (LC) device with extremely simple structure is reported. It exhibits excellent light‐transmission control even during successive 45% stretching, which is due to the combination of a super‐strong LC gel network (5CB/POSS‐G1‐BOC) and transparent conductive electrodes composed of silver nanowires (AgNWs) embedded in polyurethane (PU). The uniaxial tensile deformation mechanism of the gel network is also explained by the uniform distribution of stress acting on the device at the macro level and the evenly distributed fibers obtained from LC gel at the micro level. The fibers can equally dissipate energy through a series of homogeneous complicated changes from long and levorotatory nanofibers to short and rod‐like nanofibers with an increasing stretch ratio from 0% to 900%, which is dubbed the “spiral dissipate energy” model. These results demonstrate the unique stretchable properties of LC gel and LC devices for a wide range of applications, including wearable devices and artificial skins. 相似文献
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Wavy ribbons of carbon nanotubes (CNTs) are embedded in elastomeric substrates to fabricate stretchable conductors that exhibit excellent performance in terms of high stretchability and small resistance change. A CNT ribbon with a thin layer of sputtered Au/Pd film is transferred onto a prestrained poly(dimethylsiloxane) (PDMS) substrate and buckled out‐of‐plane upon release of the prestrain. Embedded in PDMS, the wavy CNT ribbon is able to accommodate large stretching (up to the prestrain) with little change in resistance. For a prestrain of 100%, the resistance increases only about 4.1% when the wavy CNT ribbon is stretched to the prestrain. A simple stretchable circuit consisting of a light‐emitting diode and two wavy ribbons is demonstrated and shows constant response on significant twisting, folding, or stretching. Fabricated with a simple buckling approach, the wavy CNT‐ribbon‐based stretchable conductors (e.g., interconnects and electrodes) could play an important role in stretchable electronics, sensors, photovoltaics, and energy storage. 相似文献