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https://www.readbyqxmd.com/read/28922544/flexible-photodetectors-based-on-novel-functional-materials
#1
REVIEW
Chao Xie, Feng Yan
Flexible photodetectors have attracted a great deal of research interest in recent years due to their great possibilities for application in a variety of emerging areas such as flexible, stretchable, implantable, portable, wearable and printed electronics and optoelectronics. Novel functional materials, including materials with zero-dimensional (0D) and one-dimensional (1D) inorganic nanostructures, two-dimensional (2D) layered materials, organic semiconductors and perovskite materials, exhibit appealing electrical and optoelectrical properties, as well as outstanding mechanical flexibility, and have been widely studied as building blocks in cost-effective flexible photodetection...
September 18, 2017: Small
https://www.readbyqxmd.com/read/28920434/ultralow-temperature-solution-processed-aluminum-oxide-dielectrics-via-local-structure-control-of-nanoclusters
#2
Jeong-Wan Jo, Yong-Hoon Kim, Joohyung Park, Jae Sang Heo, Seongpil Hwang, Won-June Lee, Myung-Han Yoon, Myung-Gil Kim, Sung Kyu Park
Oxide dielectric materials play a key role in a wide range of high-performance solid-state electronics from semiconductor devices to emerging wearable and soft bio-electronic devices. Although lots of previous advances are noteworthy, their typical processing temperature still far exceeds the thermal limitations of soft materials, impeding their wide utilization in these emerging fields. Here, we report an innovative route to form highly reliable aluminum-oxide dielectric films using an ultralow temperature (< 60 ˚C) solution process with a class of oxide nanocluster precursors...
September 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28913428/rubbery-electronics-and-sensors-from-intrinsically-stretchable-elastomeric-composites-of-semiconductors-and-conductors
#3
Hae-Jin Kim, Kyoseung Sim, Anish Thukral, Cunjiang Yu
A general strategy to impart mechanical stretchability to stretchable electronics involves engineering materials into special architectures to accommodate or eliminate the mechanical strain in nonstretchable electronic materials while stretched. We introduce an all solution-processed type of electronics and sensors that are rubbery and intrinsically stretchable as an outcome from all the elastomeric materials in percolated composite formats with P3HT-NFs [poly(3-hexylthiophene-2,5-diyl) nanofibrils] and AuNP-AgNW (Au nanoparticles with conformally coated silver nanowires) in PDMS (polydimethylsiloxane)...
September 2017: Science Advances
https://www.readbyqxmd.com/read/28913422/ultratransparent-and-stretchable-graphene-electrodes
#4
Nan Liu, Alex Chortos, Ting Lei, Lihua Jin, Taeho Roy Kim, Won-Gyu Bae, Chenxin Zhu, Sihong Wang, Raphael Pfattner, Xiyuan Chen, Robert Sinclair, Zhenan Bao
Two-dimensional materials, such as graphene, are attractive for both conventional semiconductor applications and nascent applications in flexible electronics. However, the high tensile strength of graphene results in fracturing at low strain, making it challenging to take advantage of its extraordinary electronic properties in stretchable electronics. To enable excellent strain-dependent performance of transparent graphene conductors, we created graphene nanoscrolls in between stacked graphene layers, referred to as multilayer graphene/graphene scrolls (MGGs)...
September 2017: Science Advances
https://www.readbyqxmd.com/read/28902990/high-purity-semiconducting-single-walled-carbon-nanotubes-a-key-enabling-material-in-emerging-electronics
#5
Jacques Lefebvre, Jianfu Ding, Zhao Li, Paul Finnie, Gregory Lopinski, Patrick R L Malenfant
Semiconducting single-walled carbon nanotubes (sc-SWCNTs) are emerging as a promising material for high-performance, high-density devices as well as low-cost, large-area macroelectronics produced via additive manufacturing methods such as roll-to-roll printing. Proof-of-concept demonstrations have indicated the potential of sc-SWCNTs for digital electronics, radiofrequency circuits, radiation hard memory, improved sensors, and flexible, stretchable, conformable electronics. Advances toward commercial applications bring numerous opportunities in SWCNT materials development and characterization as well as fabrication processes and printing technologies...
September 13, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28901749/a-highly-stretchable-and-washable-all-yarn-based-self-charging-knitting-power-textile-composed-of-fiber-triboelectric-nanogenerators-and-supercapacitors
#6
Kai Dong, Yi-Cheng Wang, Jianan Deng, Yejing Dai, Steven L Zhang, Haiyang Zou, Bohong Gu, Baozhong Sun, Zhong Lin Wang
Rapid advancements in stretchable and multifunctional wearable electronics impose a challenge on corresponding power devices that they should have comparable portability and stretchability. Here, we report a highly stretchable and washable all-yarn-based self-charging knitting power textile that enables both biomechanical energy harvesting and simultaneously energy storing by hybridizing triboelectrical nanogenerator (TENG) and supercapacitor (SC) into one fabric. With the weft-knitting technique, the power textile is qualified with high elasticity, flexibility, and stretchability, which can adapt to complex mechanical deformations...
September 15, 2017: ACS Nano
https://www.readbyqxmd.com/read/28901746/a-lab-on-skin-a-review-of-flexible-and-stretchable-electronics-for-wearable-health-monitoring
#7
Yuhao Liu, Matt Pharr, Giovanni Antonio Salvatore
Skin is the largest organ of the human body, and it offers a diagnostic interface rich with vital biological signals from the inner organs, blood vessels, muscles, and dermis/epidermis. Soft, flexible, and stretchable electronic devices provide a novel platform to interface with soft tissues for robotic feedback and control, regenerative medicine, and continuous health monitoring. Here, we introduce the term "lab-on-skin" to describe a set of electronic devices that have physical properties, such as thickness, thermal mass, elastic modulus, and water-vapor permeability, which resemble those of the skin...
September 13, 2017: ACS Nano
https://www.readbyqxmd.com/read/28895272/stretchable-electronic-sensors-of-nanocomposite-network-films-for-ultrasensitive-chemical-vapor-sensing
#8
Hong Yan, Mengjuan Zhong, Ze Lv, Pengbo Wan
A stretchable, transparent, and body-attachable chemical sensor is assembled from the stretchable nanocomposite network film for ultrasensitive chemical vapor sensing. The stretchable nanocomposite network film is fabricated by in situ preparation of polyaniline/MoS2 (PANI/MoS2 ) nanocomposite in MoS2 suspension and simultaneously nanocomposite deposition onto prestrain elastomeric polydimethylsiloxane substrate. The assembled stretchable electronic sensor demonstrates ultrasensitive sensing performance as low as 50 ppb, robust sensing stability, and reliable stretchability for high-performance chemical vapor sensing...
September 12, 2017: Small
https://www.readbyqxmd.com/read/28891805/graphene-vertically-aligned-carbon-nanotube-hybrid-on-pdms-as-stretchable-electrodes
#9
Junjun Ding, Shichen Fu, Runzhi Zhang, Eric Peter 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...
September 11, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28891284/a-highly-stretchable-nanofiber-based-electronic-skin-with-pressure-strain-and-flexion-sensitive-properties-for-health-and-motion-monitoring
#10
Kun Qi, Jianxin He, Hongbo Wang, Yuman Zhou, Xiaolu You, Nan Nan, Weili Shao, Lidan Wang, Bin Ding, Shizhong Cui
The development of flexible and stretchable electronic skins that can mimic the complex characteristics of natural skin is of great value for applications in human motion detection, healthcare, speech recognition, and robotics. In this work, we propose an efficient and low-cost fabrication strategy to construct a highly sensitive and stretchable electronic skin that enables the detection of dynamic and static pressure, strain, and flexion based on an elastic graphene oxide(GO) doped polyurethane (PU) nanofiber membrane with an ultrathin conductive poly(3,4-ethylenedioxythiophene) (PEDOT) coating layer...
September 11, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28887503/stretchable-conductive-elastomer-for-wireless-wearable-communication-applications
#11
Zhibo Chen, Jingtian Xi, Wei Huang, Matthew M F Yuen
Wearable devices have provided noninvasive and continuous monitoring of physiological parameters in healthcare applications. However, for the comfortable applications of wearable devices on human body, two key requirements are to replace conventional bulky devices into soft and deformable ones and to have wireless wearable communication. In this paper we present a simple, low-cost and highly efficient all-elastomeric conductor that can be used in a soft radio-frequency (RF) transmission line and antenna. We show a stretchable transmission line and two stretchable antennas fabricated with conventional screen printing...
September 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28876901/flexible-graphene-based-wearable-gas-and-chemical-sensors
#12
Eric Singh, M Meyyappan, Hari S Nalwa
Wearable electronics is expected to be one of the most active research areas in the next decade, therefore, nanomaterials possessing high carrier mobility, optical transparency, mechanical robustness and flexibility, light-weight, and environmental stability will be in immense demand. Graphene is one of the nanomaterials that fulfill all these requirements, along with other inherently unique properties and convenience to fabricate into different morphological nanostructures, from atomically thin single layers to nanoribbons...
September 6, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28868554/highly-flexible-and-transparent-dielectric-elastomer-actuators-using-silver-nanowire-and-carbon-nanotube-hybrid-electrodes
#13
Ye Rim Lee, Hyungho Kwon, Do Hoon Lee, Byung Yang Lee
We demonstrate a dielectric elastomer actuator (DEA) with a high areal strain value of 146% using hybrid electrodes of silver nanowires (AgNWs) and single-walled carbon nanotubes (SWCNTs). The addition of a very small amount of SWCNTs (∼35 ng mm(-2)) to a highly resistive AgNW network resulted in a remarkable reduction of the electrode sheet resistance by three orders, increasing the breakdown field by 183% and maximum strain, while maintaining the reduction of optical transmittance within 11%. The DEA based on our transparent and stretchable hybrid electrodes can be easily fabricated by a simple vacuum filtration and transfer process of the electrode film on a pre-strained dielectric elastomer membrane...
September 4, 2017: Soft Matter
https://www.readbyqxmd.com/read/28858356/2d-reentrant-auxetic-structures-of-graphene-cnt-networks-for-omnidirectionally-stretchable-supercapacitors
#14
Byoung Soo Kim, Kangsuk Lee, Seulki Kang, Soyeon Lee, Jun Beom Pyo, In Suk Choi, Kookheon Char, Jong Hyuk Park, Sang-Soo Lee, Jonghwi Lee, Jeong Gon Son
Stretchable energy storage systems are essential for the realization of implantable and epidermal electronics. However, high-performance stretchable supercapacitors have received less attention because currently available processing techniques and material structures are too limited to overcome the trade-off relationship among electrical conductivity, ion-accessible surface area, and stretchability of electrodes. Herein, we introduce novel 2D reentrant cellular structures of porous graphene/CNT networks for omnidirectionally stretchable supercapacitor electrodes...
September 14, 2017: Nanoscale
https://www.readbyqxmd.com/read/28853856/highly-stretchable-ultrasensitive-and-wearable-strain-sensors-based-on-facilely-prepared-reduced-graphene-oxide-woven-fabrics-in-an-ethanol-flame
#15
Biao Yin, Yanwei Wen, Tao Hong, Zhongshuai Xie, Guoliang Yuan, Qingmin Ji, Hongbing Jia
The recent booming development of wearable electronics urgently calls for high-performance flexible strain sensors. To date, it is still a challenge to manufacture flexible strain sensors with superb sensitivity and a large workable strain range simultaneously. Herein, a facile, quick, cost-effective, and scalable strategy is adopted to fabricate novel strain sensors based on reduced graphene oxide woven fabrics (GWF). By pyrolyzing commercial cotton bandages coated with graphene oxide (GO) sheets in an ethanol flame, the reduction of GO and the pyrolysis of the cotton bandage template can be synchronously completed in tens of seconds...
September 11, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28816043/electronic-muscles-and-skins-a-review-of-soft-sensors-and-actuators
#16
Dustin Chen, Qibing Pei
This article reviews several classes of compliant materials that can be utilized to fabricate electronic muscles and skins. Different classes of materials range from compliant conductors, semiconductors, to dielectrics, all of which play a vital and cohesive role in the development of next generation electronics. This paper covers recent advances in the development of new materials, as well as the engineering of well-characterized materials for the repurposing in applications of flexible and stretchable electronics...
September 13, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28806516/scalable-and-facile-preparation-of-highly-stretchable-electrospun-pedot-pss-pu-fibrous-nonwovens-toward-wearable-conductive-textile-applications
#17
Yichun Ding, Wenhui Xu, Wenyu Wang, Hao Fong, Zhengtao Zhu
Flexible and stretchable conductive textiles are highly desired for potential applications in wearable electronics. This study demonstrates a scalable and facile preparation of all-organic nonwoven that is mechanically stretchable and electrically conductive. Polyurethane (PU) fibrous nonwoven is prepared via the electrospinning technique; in the following step, the electrospun PU nonwoven is dip-coated with the conducting polymer poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS). This simple method enables convenient preparation of PEDOT:PSS@PU nonwovens with initial sheet resistance in the range of 35-240 Ω/sq (i...
August 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28805880/vacuum-filling-of-complex-microchannels-with-liquid-metal
#18
Yiliang Lin, Olivia Gordon, M Rashed Khan, Neyanel Vasquez, Jan Genzer, Michael D Dickey
This paper describes the utilization of vacuum to fill complex microchannels with liquid metal. Microchannels filled with liquid metal are useful as conductors for soft and stretchable electronics, as well as for microfluidic components such as electrodes, antennas, pumps, or heaters. Liquid metals are often injected manually into the inlet of a microchannel using a syringe. Injection can only occur if displaced air in the channels has a pathway to escape, which is usually accomplished using outlets. The positive pressure (relative to atmosphere) needed to inject fluids can also cause leaks or delamination of the channels during injection...
September 12, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28795567/buckled-thin-film-transistors-and-circuits-on-soft-elastomers-for-stretchable-electronics
#19
Giuseppe Cantarella, Christian Vogt, Raoul Hopf, Niko Münzenrieder, Panagiotis Andrianakis, Luisa Petti, Alwin Daus, Stefan Knobelspies, Lars Büthe, Gerhard Tröster, Giovanni A Salvatore
Although recent progress in the field of flexible electronics has allowed the realization of biocompatible and conformable electronics, systematic approaches which combine high bendability (<3 mm bending radius), high stretchability (>3-4%), and low complexity in the fabrication process are still missing. Here, we show a technique to induce randomly oriented and customized wrinkles on the surface of a biocompatible elastomeric substrate, where Thin-Film Transistors (TFTs) and circuits (inverter and logic NAND gates) based on amorphous-IGZO are fabricated...
August 30, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28790374/cross-buckled-structures-for-stretchable-and-compressible-thin-film-silicon-solar-cells
#20
Jiyoon Nam, Bowook Seo, Youngjoo Lee, Dong-Ho Kim, Sungjin Jo
Increasing interests in stretchable electronic devices have resulted in vigorous research activities, most of which are focused on structural configurations. Diverse structural configurations are available for stretchability, including stiff-island, serpentine, and buckled structures. With easily deformable shapes and simple fabrication processes, buckled structures have the potential to realize stretchability. However, conventional buckled structures exhibit stretchability only in a single-axis direction. In the present study, a new type of cross-buckled structure, which can overcome the limitations of conventional buckled structures is developed...
August 8, 2017: Scientific Reports
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