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Yanyan Gao, Jianping Xu, Shaobo Shi, Hong Dong, Yahui Cheng, Chengtai Wei, Xiaosong Zhang, Shougen Yin, Lan Li
The self-powered ultraviolet photodetectors (UV PDs) have attracted increasing attention due to their potential applications without consuming any external power. It is important to obtain the high performance self-powered UV PDs by a simple method for the practical application. Herein, TiO2 nanorod arrays (NRs) were synthesized by hydrothermal method, which were integrated with p-type NiO nanoflakes to realize a high performance pn heterojunction for the efficient UV photodetection. TiOx thin film can improve the morphological and carrier transport properties of TiO2 NRs, and decrease the surface and defect states, resulting in the enhanced photocurrent of the devices...
March 20, 2018: ACS Applied Materials & Interfaces
Huijuan Guo, Xueting Jia, Lu Liu, Xia Cao, Ning Wang, Zhong Lin Wang
Recent development of interactive motion-tracking and positioning technologies is attracting increased interests in the many areas, such as wearable electronics, intelligent electronic and internet of things. For example, the so-called somatosensory technology can afford users strong empathy of immersion and realism due to their consistent interaction with the game. Here, we report a noncontact self-powered positioning and motion-tracking system based on freestanding triboelectric nanogenerator (TENG). The TENG was fabricated by nano-engineered surface in the contact-separation mode with the use of a free moving human body (hands or foot) as the trigger...
March 14, 2018: ACS Nano
Guijun Chen, Xiaohua Liu, Sufen Li, Ming Dong, Dongyue Jiang
When a water droplet slides down a hydrophobic surface, a major energy it possesses is kinetic energy. However, people may ignore another important energy source: triboelectrification. To quantify and utilize triboelectrification energy, a phenomenon is presented in this study: one droplet slides down a tilted chip with a hydrophobic coating and patterned electrodes, triboelectrification happens and the induced charges are transferred to another horizontally placed chip with copper wires, on which another droplet is actuated by the transferred charges...
March 14, 2018: Lab on a Chip
Haitao Li, Yihe Zhang, Han Dai, Wangshu Tong, Yan Zhou, Junfeng Zhao, Qi An
This study reports on a self-powered mechanoluminescent flexible film that converts human movement into green, yellow, and white light that are visible to the naked eye. The film is simply a highly porous composite material that was prepared using a piezoelectric polymer and ZnS luminescent powders. The highly effective mechanoluminescence capabilities stem from both the film's porous structure and the strong interactions between poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) and ZnS particles...
March 7, 2018: Nanoscale
Ting Huang, Zaichun Liu, Yunlong Li, Yanqiu Li, Long Chao, Chao Chen, Yueming Tan, Qingji Xie, Shouzhuo Yao, Yuping Wu
Poly(5-hydroxytryptamine) (poly(5-HT)) is exploited as a new and efficient enzyme-immobilization matrix for amperometric and biofuel cell (BFC)-based biosensing. A GOx-poly(5-HT)-Pd nanoparticles (PdNPs) bionanocomposite is prepared by Na2 PdCl4 -initiated oxidized polymerization of 5-hydroxytryptamine (5-HT) in a neutral aqueous solution containing glucose oxidase (GOx), and this bionanocomposite and then chitosan (CS) are cast-coated on a Pd-plated Au electrode to yield a CS/GOx-poly(5-HT)-PdNPs/Pdplate /Au enzyme electrode...
July 12, 2018: Analytica Chimica Acta
Panpan Gai, Chengcheng Gu, Ting Hou, Feng Li
Biofuel cell (BFC)-based self-powered biosensors have attracted substantial attentions due to their unique merits of no need for power sources (only two electrodes needed). More importantly, in case it can also work in homogeneous system, more efficient and easy-to-use bioassays could come true. Thus, herein, we proposed, a novel homogenous self-powered biosensing strategy via integration of BFC and homogeneous electrochemical method, which was further utilized for ultrasensitive microRNA (miRNA) detection...
March 2, 2018: ACS Applied Materials & Interfaces
Weiwei Wu, Hossam Haick
Wearable devices are gaining considerable attention owing to the ease with which they can collect crucial information in real-time, both continuously and noninvasively, regarding a wearer's health. A concise summary is given of the three main elements that enable autonomous detection and monitoring of the likelihood or the existence of a health-risk state in continuous and real-time modes, with an emphasis on emerging materials and fabrication techniques in the relevant fields. The first element is the sensing technology used in the noninvasive detection of physiological markers relevant to the state of health...
March 2, 2018: Advanced Materials
Ting Liu, Mengmeng Liu, Su Dou, Jiangman Sun, Zifeng Cong, Chunyan Jiang, Chunhua Du, Xiong Pu, Weiguo Hu, Zhong Lin Wang
A major challenge accompanying with the booming next-generation soft electronics is providing correspondingly soft and sustainable power sources for driving such devices. Here, we report stretchable triboelectric nanogenerators (TENG) with dual working modes based on the soft hydrogel-elastomer hybrid as energy skins for harvesting biomechanical energies. The tough interfacial bonding between the hydrophilic hydrogel and hydrophobic elastomer, achieved by the interface modification, ensures the stable mechanical and electrical performances of the TENGs...
March 1, 2018: ACS Nano
Jinsung Chun, Ravi Anant Kishore, Prashant Kumar, Min-Gyu Kang, Han Byul Kang, Mohan Sanghadasa, Shashank Priya
We demonstrate a thermo-magneto-electric generator (TMEG) based on second order phase transition of soft magnetic materials that provides promising pathway for scavenging low grade heat. It takes advantage of the cyclic magnetic forces of attraction and repulsion arising through ferromagnetic-to-paramagnetic phase transition to create mechanical vibrations which are converted into electricity through piezoelectric benders. In order to enhance the mechanical vibrations frequency and thereby output power of TMEG, we utilize the nonlinear behaviour of piezoelectric cantilevers and enhanced thermal transport through silver (Ag) nanoparticles (NPs) applied on the surface of a soft magnet...
February 23, 2018: ACS Applied Materials & Interfaces
Song Qi, Hengyu Guo, Jie Chen, Jie Fu, Chenguo Hu, Miao Yu, Zhong Lin Wang
The monitoring of the magnetic field is the most significant process for academic or industrial applications. In this study, we design a self-powered magnetic-field sensor based on the magnetorheological elastomer (MRE) and triboelectric nanogenerator (TENG) that can be used for both time-varying and uniform magnetic field (UMF) sensing. This TENG-based magnetic-field sensor (TMFS) relies on contact electrification and electrostatic induction of TENG to generate an electrical signal in response to the magnetic-induced deformation of MRE without using an external power supply...
February 21, 2018: Nanoscale
Marcus W Ni, Ray O Prather, Giovanna Rodriguez, Rachel Quinn, Eduardo Divo, Mark Fogel, Alain J Kassab, William M DeCampli
Children born with anatomic or functional "single ventricle" must progress through two or more major operations to sustain life. This management sequence culminates in the total cavopulmonary connection, or "Fontan" operation. A consequence of the "Fontan circulation", however, is elevated central venous pressure and inadequate ventricular preload, which contribute to continued morbidity. We propose a solution to these problems by increasing pulmonary blood flow using an "injection jet" (IJS) in which the source of blood flow and energy is the ventricle itself...
February 20, 2018: Cardiovascular Engineering and Technology
Qianhui Yang, Qing Hao, Jianping Lei, Huangxian Ju
A portable photoelectrochemical (PEC) device is developed by intergating a self-powered electrochromic tablet for visual analysis. The tablet consists of an electron-injector (EI) part for photo-to-electric conversion and an electrochromic (EC) part for visualized readout, which are coated with dye-sensitized titanium dioxide film and Ni-doped tungsten trioxide (WO3) film, respectively. Under the illumination of a white LED light, the photoexcited electrons generated from EI part convey to EC part through the conductive inner side of indium tin oxide slide and would cause color change of the Ni-doped WO3 film in the presence of protons...
February 20, 2018: Analytical Chemistry
Jianan Deng, Xiao Kuang, Ruiyuan Liu, Wenbo Ding, Aurelia C Wang, Ying-Chih Lai, Kai Dong, Zhen Wen, Yaxian Wang, Lili Wang, H Jerry Qi, Tong Zhang, Zhong Lin Wang
Functional polymers possess outstanding uniqueness in fabricating intelligent devices such as sensors and actuators, but they are rarely used for converting mechanical energy into electric power. Here, a vitrimer based triboelectric nanogenerator (VTENG) is developed by embedding a layer of silver nanowire percolation network in a dynamic disulfide bond-based vitrimer elastomer. In virtue of covalent dynamic disulfide bonds in the elastomer matrix, a thermal stimulus enables in situ healing if broken, on demand reconfiguration of shape, and assembly of more sophisticated structures of VTENG devices...
February 19, 2018: Advanced Materials
Piyush Kanti Sarkar, Subrata Maji, Somobrata Acharya
We report on a flexible triboelectric nanogenerator (FTENG) designed using polydimethylsiloxane (PDMS) and aluminium (Al) combinations to convert ambient mechanical energy into electrical outputs. An open-circuit output voltage of ~40 V and short-circuit current density of ~63.6 mA m-2 with power density 0.62 W m-2 was easily obtained from the FTENG. The harvested mechanical energy is used for lighting ~100 light emitting diodes and to operate seven segment display enabling prospects for carbon-emission free environment friendly source for powering portable electronic devices...
March 1, 2018: Journal of Nanoscience and Nanotechnology
Guoyun Gao, Bensong Wan, Xingqiang Liu, Qijun Sun, Xiaonian Yang, Longfei Wang, Caofeng Pan, Zhong Lin Wang
With the Moore's law hitting the bottleneck of scaling-down in size (below 10 nm), personalized and multifunctional electronics with an integration of 2D materials and self-powering technology emerge as a new direction of scientific research. Here, a tunable tribotronic dual-gate logic device based on a MoS2 field-effect transistor (FET), a black phosphorus FET and a sliding mode triboelectric nanogenerator (TENG) is reported. The triboelectric potential produced from the TENG can efficiently drive the transistors and logic devices without applying gate voltages...
February 13, 2018: Advanced Materials
Kyoung-Yong Chun, Young Jun Son, Eun-Seok Jeon, Sehan Lee, Chang-Soo Han
Highly efficient human skin systems transmit fast adaptive (FA) and slow adaptive (SA) pulses selectively or consolidatively to the brain for a variety of external stimuli. The integrated analysis of these signals determines how humans perceive external physical stimuli. Here, a self-powered mechanoreceptor sensor based on an artificial ion-channel system combined with a piezoelectric film is presented, which can simultaneously implement FA and SA pulses like human skin. This device detects stimuli with high sensitivity and broad frequency band without external power...
February 9, 2018: Advanced Materials
Xiandi Wang, Yufei Zhang, Xiaojia Zhang, Zhihao Huo, Xiaoyi Li, Miaoling Que, Zhengchun Peng, Hui Wang, Caofeng Pan
Recently, the quest for new highly stretchable transparent tactile sensors with large-scale integration and rapid response time continues to be a great impetus to research efforts to expand the promising applications in human-machine interactions, artificial electronic skins, and smart wearable equipment. Here, a self-powered, highly stretchable, and transparent triboelectric tactile sensor with patterned Ag-nanofiber electrodes for detecting and spatially mapping trajectory profiles is reported. The Ag-nanofiber electrodes demonstrate high transparency (>70%), low sheet resistance (1...
February 7, 2018: Advanced Materials
Peihua Yang, Xiaopeng Qu, Kang Liu, Jiangjiang Duan, Jia Li, Qian Chen, Guobin Xue, Wenke Xie, Zhimou Xu, Jun Zhou
Energy harvesting and storage are two distinct processes that are generally achieved using two separated parts based on different physical and chemical principles. Here we report a self-charging capacitive power cell that directly couples the energy harvesting and storage processes into one device. The device consists of two identical carbon nanotube/titanium electrodes, separated by a piece of anodic aluminum oxide nanochannels membrane. Pressure-driven electrolyte flow through the nanochannels generates streaming potential, which can be used to charge the capacitive electrodes, accomplishing simultaneous energy generation and storage...
February 6, 2018: ACS Applied Materials & Interfaces
Guoxu Liu, Jinhui Nie, Chang Bao Han, Tao Jiang, Zhi Wei Yang, Yao Kun Pang, Liang Xu, Tong Guo, Tianzhao Bu, Chi Zhang, Zhong Lin Wang
The physical filtration mechanism of traditional face mask has a low removal efficiency of ultrafine particulates in the size range of 10-1000 nm, which are badly harmful to human health. Herein, a novel self-powered electrostatic-adsorption face mask (SEA-FM) based on the Poly (vinylidene fluoride) electrospun nanofiber film (PVDF-ESNF) and triboelectric nanogenerator (TENG) driven by respiration (R-TENG) is developed. The ultrafine particulates are electrostatically adsorbed by the PVDF-ESNF and the R-TENG can continually provide electrostatic charges in this adsorption process by respiration...
February 2, 2018: ACS Applied Materials & Interfaces
Buddha Deka Boruah, Shanmukh Naidu Majji, Sukanta Nandi, Abha Misra
The pyro-phototronic effect can be used in pyroelectric semiconductor materials to significantly contribute in enhancing the self-powered photoresponse of photodetectors (PDs) via modulation of the photogenerated charge density. The pyro-phototronic effect in zinc oxide (ZnO) nanorods (NRs) was exploited thoroughly by doping with halogen elements, such as fluorine, chlorine (Cl), bromine and iodine. Cl-doped ZnO NRs (Cl : ZnO NRs) induces a large number of free charge carriers to enhance the self-powered photoresponse behavior (nearly 333% enhancement in response current) due to the pyro-phototronic effect as compared to pristine ZnO NRs...
February 2, 2018: Nanoscale
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