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Wearable electronics

Xin Li, Haijun Wu, Cao Guan, Abdelnaby M Elshahawy, Yangtao Dong, Stephen J Pennycook, John Wang
Supercapacitors (SCs) have been widely studied as a class of promising energy-storage systems for powering next-generation E-vehicles and wearable electronics. Fabricating hybrid-types of electrode materials and designing smart nanoarchitectures are effective approaches to developing high-performance SCs. Herein, first, a Ni-Co selenide material (Ni,Co)Se2 with special cactus-like structure as the core, to scaffold the NiCo-layered double hydroxides (LDHs) shell, is designed and fabricated. The cactus-like structural (Ni,Co)Se2 core, as a highly conductive and robust support, promotes the electron transport as well as hinders the agglomeration of LDHs...
December 17, 2018: Small
Shisheng Lin, Yanghua Lu, Sirui Feng, Zhenzhen Hao, Yanfei Yan
Traditionally, Schottky diodes are used statically in the electronic information industry while dynamic or moving Schottky diode-based applications are rarely explored. Herein, a novel Schottky diode named "moving Schottky diode generator" is designed, which can convert mechanical energy into electrical energy by means of lateral movement between the graphene/metal film and semiconductor. The mechanism is based on the built-in electric field separation of the diffusing carriers in moving Schottky diode...
December 17, 2018: Advanced Materials
Kukjoo Kim, Young-Geun Park, Byung Gwan Hyun, Minjae Choi, Jang-Ung Park
Advances in materials science and the desire for next-generation electronics have driven the development of stretchable and transparent electronics in the past decade. Novel applications, such as smart contact lenses and wearable sensors, have been introduced with stretchable and transparent form factors, requiring a deeper and wider exploration of materials and fabrication processes. In this regard, many research efforts have been dedicated to the development of mechanically stretchable, optically transparent materials and devices...
December 17, 2018: Advanced Materials
Mariachiara Ricci, Monica Terribili, Franco Giannini, Vito Errico, Antonio Pallotti, Cinzia Galasso, Laura Tomasello, Silvia Sias, Giovanni Saggio
Developmental coordination disorder (DCD) and attention-deficit hyperactivity disorder (ADHD) are neuro-developmental disorders, starting in childhood, which can affect the planning of movements and the coordination. We investigated how and in which measure a system based on wearable inertial measurement units (IMUs) can provide an objective support to the diagnosis of motor impairments in school-aged children. The IMUs measured linear and rotational movements of 37 schoolchildren, 7-10yo, 17 patients and 20 control subjects, during the execution of motor exercises, performed under medical and psychiatric supervision, to assess different aspects of the motor coordination...
December 8, 2018: Journal of Biomechanics
Yucheng Liu, Yunxia Zhang, Zhou Yang, Haochen Ye, Jiangshan Feng, Zhuo Xu, Xu Zhang, Rahim Munir, Jia Liu, Ping Zuo, Qingxian Li, Mingxin Hu, Lina Meng, Kang Wang, Detlef-M Smilgies, Guangtao Zhao, Hua Xu, Zupei Yang, Aram Amassian, Jiawei Li, Kui Zhao, Shengzhong Frank Liu
Single crystalline perovskites exhibit high optical absorption, long carrier lifetime, large carrier mobility, low trap-state-density and high defect tolerance. Unfortunately, all single crystalline perovskites attained so far are limited to bulk single crystals and small area wafers. As such, it is impossible to design highly demanded flexible single-crystalline electronics and wearable devices including displays, touch sensing devices, transistors, etc. Herein we report a method of induced peripheral crystallization to prepare large area flexible single-crystalline membrane (SCM) of phenylethylamine lead iodide (C6 H5 C2 H4 NH3 )2 PbI4 with area exceeding 2500 mm2 and thinness as little as 0...
December 13, 2018: Nature Communications
Zuqing Yuan, Xinyu Du, Huidan Niu, Nianwu Li, Guozhen Shen, Congju Li, Zhong Lin Wang
The development of flexible electronics has extended the limit of the intelligent devices, which are highly sensitive, soft and capable of sustaining arbitrary deformation. Here, we report a liquid-polymer tubular triboelectric nanogenerator (L-P TENG) that is filled with liquid for a shape-adaptive sensor in various working modes. The L-P TENG is based on liquid-solid contact electrification with the use of displacement current and excited by the shape change of the tubular structure. The high softness of the device makes it possible to be twisted to any curve and bear extreme strain...
December 13, 2018: Nanoscale
Sukjae Jang, Seonghoon Jang, Eun-Hye Lee, Minji Kang, Gunuk Wang, Tae-Wook Kim
Ultrathin Conformable artificial synapse platforms that can be used as on-body or wearable chips suggest a path to build next-generation, wearable, intelligent electronic systems that can mimic the synaptic operations of the human brain. So far, an artificial synapse architecture with ultimate mechanical flexibility in a free-standing form while maintaining its functionalities with high stability and accuracy on any conformable substrate has not been demonstrated yet. Here, we demonstrate the first ultrathin artificial synapse (~ 500 nm total thickness) that features free-standing ferroelectric organic neuromorphic transistors (FONTs), which can stand alone without a substrate or an encapsulation layer...
December 10, 2018: ACS Applied Materials & Interfaces
Insic Hong, Seunggon Lee, Dongkwan Kim, Hyunmin Cho, Yeonwook Roh, Hyeongi An, Sukjoon Hong, Seungyong Han, Seung Hwan Ko
Copper nanowires (Cu NWs) are suitable material as an electrode for flexible, stretchable and wearable devices due to their excellent mechanical properties, high transparency, good conductivity, and low cost, but oxidation problem limits their practical use and application. In order to use Cu NWs as an electrode for advanced flexible, stretchable and wearable devices attached directly to the skin, the influence of the body temperature on the oxidation of Cu NWs needs to be investigated. In this paper, the oxidation behavior of Cu NWs at high temperature (more than 80 °C) as well as body temperature is studied which has been remained largely questionable to date, and an effective encapsulation method is proposed to prevent the oxidation of Cu NWs electrode in the range of body temperatures...
November 23, 2018: Nanotechnology
Jing Liu, Yanhua Jia, Qinglin Jiang, Fengxing Jiang, Changcun Li, Xiaodong Wang, Peng Liu, Peipei Liu, Fei Hu, Yukou Du, Jingkun Xu
The requirement of a portable electron is functioning as a driving force for a wearable energy instrument. Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), as one of the most promising organic electron materials, has been widely studied in energy conversion devices. However, the efforts for PEDOT:PSS fibers are insufficient to boost the development of wearable thermoelectric energy harvesting. Here, a highly conductive p-type PEDOT:PSS fiber was produced by gelation process, which was 3 orders of magnitude higher than that of previous hydrogel fibers...
December 7, 2018: ACS Applied Materials & Interfaces
Andrew T Kleinschmidt, Darren J Lipomi
The field of π-conjugated (semiconducting) polymers has been underwritten largely because of the promise of flexible (and increasingly, stretchable) devices for energy and health care. Our research group has spent much of the past six years studying the mechanical properties of conjugated polymers. Mechanically robust materials can extend the life spans of devices such as solar cells and organic light-emitting diode (OLED) panels and enable high throughput processing techniques such as roll-to-roll printing...
December 5, 2018: Accounts of Chemical Research
C Muhammed Ajmal, Seonghyun Bae, Seunghyun Baik
Nanocomposite fibers, composed of conductive nanoparticles and polymer matrix, are crucial for wearable electronics. However, the nanoparticle mixing approach results in aggregation and dispersion problems. A revolutionary synthesis method by premixing silver precursor ions (silver ammonium acetate) with polyvinyl alcohol is reported here. The solvation of ions-prevented aggregation, and uniformly distributed silver nanoparticles (in situ AgNPs, 77 nm) are formed after thermal reduction (155 °C) without using additional reducing or dispersion agents...
December 4, 2018: Small
Zhimin Chai, Jungho Seo, Salman A Abbasi, Ahmed Busnaina
Carbon nanotubes (CNTs) are promising building blocks for emerging wearable electronics and sensors due to their outstanding electrical and mechanical properties. However, the practical applications of the CNTs face challenges of efficiently and precisely placing them at the desired location with controlled orientation and density. Here, we introduce an electro-fluidic assembly process to assemble highly aligned and densely packed CNTs selectively on a substrate with patterned wetted areas at a high rate. An electric field is applied during the electro-fluidic assembly process, which drives the CNTs close to the patterned regions and shortens the assembly time...
December 4, 2018: ACS Nano
Zifeng Wang, Funian Mo, Longtao Ma, Qi Yang, Guojin Liang, Zhuoxin Liu, Hongfei Li, Na Li, Haiyan Zhang, Chunyi Zhi
The fast advancement in flexible and wearable electronics has put up with new requirements on the energy storage device with improved tolerance to deformation apart from offering power output. Despite the tremendous progress in stretchable energy storage devices, the compressional energy storage devices have indeed received limited research attention. In this work, an intrinsically compressible rechargeable battery was proposed using the Zn-MnO2 chemistry and a crosslinked polyacrylamide (PAAm) hydrogel electrolyte...
December 3, 2018: ACS Applied Materials & Interfaces
Minjie Yao, Rui Wang, Zifang Zhao, Yue Liu, Zhiqiang Niu, Jun Chen
The recent boom in flexible and wearable electronic devices has increased the demand for flexible energy storage devices. Flexible lithium-sulfur (Li-S) battery is considered to be a promising candidate due to its high energy density and low cost. Herein, a flexible Li-S battery was fabricated based on a all-in-one integrated configuration, where multi-walled carbon nanotubes/sulfur (MWCNTs/S) cathode, MWCNTs/MnO2 interlayer, polypropylene (PP) separator and Li anode were integrated together by combining blade coating with vacuum evaporation methods...
December 3, 2018: ACS Nano
Shengjie Ling, Qi Wang, Dong Zhang, Yingying Zhang, Xuan Mu, David L Kaplan, Markus J Buehler
The production of structural and functional materials with enhanced mechanical properties through the integration of soft and hard components is a common approach to Nature's materials design. However, directly mimicking these optimized design routes in the lab for practical applications remains challenging. For example, graphene and silk are two materials with complementary mechanical properties that feature ultrahigh stiffness and toughness, respectively. Yet no simple and controllable approach has been developed to homogeneously integrate these two components into functional composites, mainly due to the hydrophobicity and chemical inertness of the graphene...
February 28, 2018: Advanced Functional Materials
Joong Tark Han, Jeong In Jang, Joon Young Cho, Jun Yeon Hwang, Jong Seok Woo, Hee Jin Jeong, Seung Yol Jeong, Seon Hee Seo, Geon-Woong Lee
A correction to this article has been published and is linked from the HTML and PDF versions of this paper. The error has been fixed in the paper.
November 30, 2018: Scientific Reports
Jheng-Wun Su, Jianhua Wang, Yonggang Zheng, Shan Jiang, Jian Lin
Mechanically guided assembly is considered as a facile and scalable methodology for fabrication of three-dimensional (3D) structures. However, most of the previous methods require multistep processes for bonding bi- or multi-layers and only result in non-freestanding 3D structures due to usage of a supporting elastomer substrate. Herein, we report a functional elastomer composite that can be transformed to a freestanding and monolithic 3D structure driven by the mechanically guided assembly. Photolithography can be used to selectively tune the mechanical properties of UV exposed regions which exhibit enhanced elasticity compared with the non-exposed regions...
December 3, 2018: ACS Applied Materials & Interfaces
Minghan Hu, Karsten Korschelt, Melanie Viel, Nadine Wiesmann, Michael Kappl, Jürgen Brieger, Katharina Landfester, Héloïse Thérien-Aubin, Wolfgang Tremel
Electrospun polymer mats are widely used in tissue engineering, wearable electronics, and water purification. However, in many environments the polymer nanofibers prepared by electrospinning suffer from biofouling during long-term usage, resulting in persistent infections and device damage. Herein, we describe the fabrication of polymer mats with CeO2-x nanorods that can prevent biofouling in aqueous environment. The embedded CeO2-x nanorods are functional mimics of natural haloperoxidases that catalyze the oxidative bromination of Br- and H2O2 to HOBr...
November 30, 2018: ACS Applied Materials & Interfaces
Weiguo Hu, Chi Zhang, Zhong Lin Wang
As the electronic technology is approaching its limits of materials and processing, a smart interaction between functional device and environment is a promising way for future electronic technology above the Moore's law. The mechanical signal triggering is the most common and natural way for the smart interactions, which has realized direct interaction between human/ambient and electronics and artificial intelligence. In 2006, the piezotronic effect, as a novel effect, was first proposed by Wang to achieve the effective, adaptive and seamless interactions between electronic devices and the external stress, which utilizes the piezoelectric polarization potential as the virtual gate to tune/control the carriers' transportation in the electronic device...
January 25, 2019: Nanotechnology
Thomas Ganslandt, Michael Neumaier
Medical care is increasingly delivered by multiple providers across healthcare sectors and specialties, leading to a fragmentation of the electronic patient record across organizations and vendor IT systems. The rapid uptake of wearables and connected diagnostic devices adds another source of densely collected data by the patients themselves. Integration of these data sources opens up several potentials: a longitudinal view of laboratory findings would close the gaps between individual provider visits and allow to more closely follow disease progression...
November 29, 2018: Clinical Chemistry and Laboratory Medicine: CCLM
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