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Ruoxing Wang, Shengjie Gao, Zhen Yang, Yule Li, Weinong Chen, Benxin Wu, Wenzhuo Wu
Recent advances achieved in triboelectric nanogenerators (TENG) focus on boosting power generation and conversion efficiency. Nevertheless, obstacles concerning economical and biocompatible utilization of TENGs continue to prevail. Being an abundant natural biopolymer from marine crustacean shells, chitosan enables exciting opportunities for low-cost, biodegradable TENG applications in related fields. Here, the development of biodegradable and flexible TENGs based on chitosan is presented for the first time...
January 19, 2018: Advanced Materials
Hongyan Zhang, Min Zhang, Cunchong Lin, Jun Zhang
A highly sensitive self-powered humidity sensor has been realized from AuNPs hybrid black zinc oxide (ZnO) nanorods prepared through a sol-gel method. XRD pattern reveals that both ZnO and ZnO/AuNPs exhibit a wurtzite structure. ZnO/AuNPs nanorods grow in a vertical alignment, which possesses high uniformity and forms dense arrays with a smaller diameter than that of ZnO nanoparticles. All ZnO/AuNPs and pure black ZnO show lower band gap energy than the typically reported 3.34 eV of pure ZnO. Furthermore, the band gap of ZnO/AuNPs nanocomposites is effectively influenced by the amount of AuNPs...
January 13, 2018: Sensors
Jan Kokert, Tobias Beckedahl, Leonhard M Reindl
In self-powered microsystems, a power management is essential to extract, transfer and regulate power from energy harvesting sources to loads such as sensors. The challenge is to consider all of the different structures and components available and build the optimal power management on a microscale. The purpose of this paper is to streamline the design process by creating a novel reconfigurable testbed called Medlay. First, we propose a uniform interface for management functions e.g., power conversion, energy storing and power routing...
January 17, 2018: Sensors
Nie Jinhui, Zewei Ren, Jiajia Shao, Chaoran Deng, Liang Xu, Xiangyu Chen, Meicheng Li, Zhong Lin Wang
Electrowetting technique is an actuation method for manipulating position and velocity of fluids in the microchannels. By combining electrowetting technique and a freestanding mode triboelectric nanogenerator (TENG), we have designed a self-powered micro-fluidic transport system. In this system, a mini vehicle is fabricated by using four droplets to carry a pallet (6 mm × 8 mm) and it can transport some tiny object on the track electrodes under the drive of TENG. The motion of TENG can provide both driving power and control signal for the mini vehicle...
January 17, 2018: ACS Nano
Hemalatha Parangusan, Deepalekshmi Ponnamma, Mariam Al Ali Al-Maadeed
Herein, we investigate the morphology, structure and piezoelectric performances of neat polyvinylidene fluoride hexafluoropropylene (PVDF-HFP) and PVDF-HFP/Co-ZnO nanofibers, fabricated by electrospinning. An increase in the amount of crystalline β-phase of PVDF-HFP has been observed with the increase in Co-doped ZnO nanofiller concentration in the PVDF-HFP matrix. The dielectric constants of the neat PVDF-HFP and PVDF-HFP/2 wt.% Co-ZnO nanofibers are derived as 8 and 38 respectively. The flexible nanogenerator manipulated from the polymer nanocomposite (PVDF-HFP/Co-ZnO) exhibits an output voltage as high as 2...
January 15, 2018: Scientific Reports
Yejing Dai, Xingfu Wang, Wenbo Peng, Cheng Xu, Changsheng Wu, Kai Dong, Ruiyuan Liu, Zhong Lin Wang
Cadmium sulfide (CdS) has received widespread attention as the building block of optoelectronic devices due to its extraordinary optoelectronic properties, low work function, and excellent thermal and chemical stability. Here, a self-powered flexible photodetector (PD) based on p-Si/n-CdS nanowires heterostructure is fabricated. By introducing the pyro-phototronic effect derived from wurtzite structured CdS, the self-powered PD shows a broadband response range, even beyond the bandgap limitation, from UV (325 nm) to near infrared (1550 nm) under zero bias with fast response speed...
January 15, 2018: Advanced Materials
Rohit Saraf, Long Pu, Vivek Maheshwari
Organolead trihalide perovskite MAPbI3 shows a distinctive combination of properties such as being ferroelectric and semiconducting, with ion migration effects under poling by electric fields. The combination of its ferroelectric and semiconducting nature is used to make a light harvesting, self-powered tactile sensor. This sensor interfaces ZnO nanosheets as a pressure-sensitive drain on the MAPbI3 film and once poled is operational for at least 72 h with just light illumination. The sensor is monolithic in structure, has linear response till 76 kPa, and is able to operate continuously as the energy harvesting mechanism is decoupled from its pressure sensing mechanism...
January 15, 2018: Advanced Materials
Wenyan Yang, Wuxiao Han, Huiling Gao, Linlin Zhang, Shuai Wang, Lili Xing, Yan Zhang, Xinyu Xue
As the concentration of different biomarkers in human body fluids are an important parameter of chronic disease, wearable biosensors for in situ analysis of body fluids with high sensitivity, real-time detection, flexibility and biocompatibility have significant potential therapeutic applications. In this paper, a flexible self-powered implantable electronic-skin (e-skin) for in situ body fluids analysis (urea/uric-acid) as a real-time kidney-disease diagnoser has been proposed based on the piezo-enzymatic-reaction coupling process of ZnO nanowire arrays...
January 11, 2018: Nanoscale
Pandey Rajagopalan, Vipul Singh, Palani I A
Zinc oxide (ZnO) is a remarkable inorganic semiconductor with exceptional piezoelectric properties compared to other semiconductors. However, in comparison to lead-based hazardous piezoelectric materials, its features have undesired limitations. Here we report the 5~6 folds enhancement in the piezoelectric properties via chemical doping of copper matched to intrinsic ZnO. The flexible piezoelectric nanogenerator (F-PENG) device was fabricated using an unpretentious solution process of spin coating with other advantages like robust, low weight, improved adhesion, and low cost...
January 10, 2018: Nanotechnology
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
Siu-Fung Leung, Kang-Ting Ho, Po-Kai Kung, Vincent K S Hsiao, Husam N Alshareef, Zhong Lin Wang, Jr-Hau He
Flexible and self-powered photodetectors (PDs) are highly desirable for applications in image sensing, smart building, and optical communications. In this paper, a self-powered and flexible PD based on the methylammonium lead iodide (CH3 NH3 PBI3 ) perovskite is demonstrated. Such a self-powered PD can operate even with irregular motion such as human finger tapping, which enables it to work without a bulky external power source. In addition, with high-quality CH3 NH3 PBI3 perovskite thin film fabricated with solvent engineering, the PD exhibits an impressive detectivity of 1...
January 10, 2018: Advanced Materials
Chunmei Cui, Xingzhao Wang, Zhiran Yi, Bin Yang, Xiaolin Wang, Xiang Chen, Jing-Quan Liu, Chunsheng Yang
Triboelectric nanogenerators (TENGs) converting mechanical energy into electrical energy have been widely concerned due to their huge potential applications for supplying power to electronic devices. Improving the performance of TENGs has become the research hot point due to their output limited current. In this paper, we propose a flexible single-electrode triboelectric nanogenerator based on porous Na2CO3/PDMS structure to enhance the triboelectric performance for nanogenerators. In order to compare their output performance, NaCl and sugar are normally used as sacrificial template for triboelectric nanogenerator...
January 9, 2018: ACS Applied Materials & Interfaces
Shuwen Chen, Nan Wu, Long Ma, Shizhe Lin, Fang Yuan, Zisheng Xu, Wenbo Li, Bo Wang, Jun Zhou
Advances in mobile networks and low-power electronics have driven smart mobile medical devices at a tremendous pace, evoking increased interest in household healthcare, especially for those with cardiovascular or respiratory disease. Thus, flexible, battery-free pressure sensors, with great potential for monitoring respiration and heartbeat in a smart way, are urgently demanded. However, traditional flexible battery-free pressure sensors for subtle physiological signals detecting, are mostly tightly adhered onto skin instead of working under the pressure of body weight in a non-contact mode, as the low sensitivity in high-pressure region can hardly meet the demands...
January 5, 2018: ACS Applied Materials & Interfaces
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
Francesco Dal Dosso, Deborah Decrop, Elena Pérez-Ruiz, Devin Daems, Hannah Agten, Osamah Al-Ghezi, Olivier Bollen, Jolien Breukers, Florian De Rop, Maria Katsafadou, Jens Lepoudre, Linye Lyu, Pieter Piron, Robbe Saesen, Shoera Sels, Rani Soenen, Ellen Staljanssens, Jehan Taraporewalla, Tadej Kokalj, Dragana Spasic, Jeroen Lammertyn
The lab-on-a-chip (LOC) field has witnessed an excess of new technology concepts, especially for the point-of-care (POC) applications. However, only few concepts reached the POC market often because of challenging integration with pumping and detection systems as well as with complex biological assays. Recently, a new technology termed SIMPLE was introduced as a promising POC platform due to its features of being self-powered, autonomous in liquid manipulations, cost-effective and amenable to mass production...
February 13, 2018: Analytica Chimica Acta
Hongjun Chen, Meng Zhang, Renheng Bo, Chog Barugkin, Jianghui Zheng, Qingshan Ma, Shujuan Huang, Anita W Y Ho-Baillie, Kylie R Catchpole, Antonio Tricoli
Hybrid halide perovskite is one of the promising light absorber and is intensively investigated for many optoelectronic applications. Here, the first prototype of a self-powered inorganic halides perovskite for chemical gas sensing at room temperature under visible-light irradiation is presented. These devices consist of porous network of CsPbBr3 (CPB) and can generate an open-circuit voltage of 0.87 V under visible-light irradiation, which can be used to detect various concentrations of O2 and parts per million concentrations of medically relevant volatile organic compounds such as acetone and ethanol with very quick response and recovery time...
December 27, 2017: Small
Qian Zhang, Tao Jiang, Dong Hae Ho, Shanshan Qin, Xixi Yang, Jeong Ho Cho, Qijun Sun, Zhong Lin Wang
Electronic skin based on multimodal sensing array is ready to detect various stimuli in different categories by utilizing highly sensitive materials, sophisticated geometry designs, and integration of multifunctional sensors. However, it is still difficult to distinguish multiple and complex mechanical stimuli in a local position by conventional multimodal E-skin, which is significantly important in the signals feedback of robotic fine motions and human-machine interactions. Here, we present a transparent, flexible and self-powered multi-stage sensation matrix based on piezoelectric nanogenerators (NGs) constructed in a crossbar design...
December 20, 2017: ACS Nano
Weili Deng, Long Jin, Yueqi Chen, Wenjun Chu, Binbin Zhang, Huan Sun, Da Xiong, Zekai Lv, Minhao Zhu, Weiqing Yang
In this paper, a piezoelectric nanogenerator (PENG) based on a tuning fork-shaped cantilever was designed and fabricated, aiming at harvesting low frequency vibration energy in the environment. In the PENG, a tuning fork-shaped elastic beam combined with ZnO nanorods (NRs), instead of conventional rectangular cantilever beams, was adopted to extract vibration energy. Benefiting from the high flexibility and the controllable shape of the substrate, this PENG was extremely sensitive to vibration and can harvest weak vibration energy at a low frequency...
December 20, 2017: Nanoscale
Azadeh Mirabedini, Shazed Aziz, Geoffrey M Spinks, Javad Foroughi
The demands for new types of artificial muscles continue to grow and novel approaches are being enabled by the advent of new materials and novel fabrication strategies. Self-powered actuators have attracted significant attention due to their ability to be driven by elements in the ambient environment such as moisture. In this study, we demonstrate the use of twisted and coiled wet-spun hygroscopic chitosan fibers to achieve a novel torsional artificial muscle. The coiled fibers exhibited significant torsional actuation where the free end of the coiled fiber rotated up to 1155 degrees per mm of coil length when hydrated...
December 2017: Soft Robotics
Hang Zhang, Zhongheng Fu, Ruifeng Zhang, Qianfan Zhang, Hongzhen Tian, Dominik Legut, Timothy C Germann, Yuanqi Guo, Shiyu Du, Joseph S Francisco
Efficient flexible energy storage systems have received tremendous attention due to their enormous potential applications in self-powering portable electronic devices, including roll-up displays, electronic paper, and "smart" garments outfitted with piezoelectric patches to harvest energy from body movement. Unfortunately, the further development of these technologies faces great challenges due to a lack of ideal electrode materials with the right electrochemical behavior and mechanical properties. MXenes, which exhibit outstanding mechanical properties, hydrophilic surfaces, and high conductivities, have been identified as promising electrode material candidates...
December 11, 2017: Proceedings of the National Academy of Sciences of the United States of America
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