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Jun Yang, Peibo Liu, Xingzhan Wei, Wei Luo, Jin Yang, Hao Jiang, Dapeng Wei, Ruiying Shi, Haofei Shi
A high performance transparent and flexible triboelectric nanogenerator (TENG) based on graphene composite electrodes via surface engineering is proposed and demonstrated. Through modifying the CVD-grown graphene by conductive polymer poly(3,4-ethylenedioxy-thiophene):polystyrenesulfonate (PEDOT:PSS), the composite electrodes with excellent optoelectronic performances were fabricated, which exhibited a high transmittance up to 85% and sheet resistance of 85 Ω/□ decreasing from the initial value of 725 Ω/□...
September 22, 2017: ACS Applied Materials & Interfaces
Yanchao Mao, Nan Zhang, Yingjie Tang, Meng Wang, Mingju Chao, Erjun Liang
Paper, as one of the most important inventions of mankind, is still widely used in our daily life. In this study, the paper is explored as a platform for power sources based on the universally known triboelectric friction. A novel paper triboelectric nanogenerator (P-TENG) was successfully developed, which could harvest mechanical energy from ambient sources and generate considerable electrical energy. The maximum power density of the P-TENG reached 53 W m(-2). In addition, the P-TENG possesses a natural advantage of being able to be integrated within a book, and thus can effectively convert mechanical energy from the action of turning book pages into electricity...
September 20, 2017: Nanoscale
Congju Li, Yingying Yin, Bin Wang, Tao Zhou, Jiaona Wang, Jianjun Luo, Wei Tang, Ran Cao, Zuqing Yuan, Nianwu Li, Xinyu Du, Chunru Wang, Shuyu Zhao, Yuebo Liu, Zhong Lin Wang
Broadening the application area of the triboelectric nanogenerators (TENGs) is one of the research emphases in the study of the TENGs, whose unique output characteristic is high voltage with low current. Here we design a self-powered electrospinning system, which is composed of a rotating-disk TENG (R-TENG), a voltage doubling rectifying circuit (VDRC) and a simple spinneret. The R-TENG can generate an alternating voltage up to 1400 V. By using a voltage doubling rectifying circuit, a maximum constant direct voltage of 8...
September 19, 2017: ACS Nano
Longxing Su, Wei Yang, Jian Cai, Hongyu Chen, Xiaosheng Fang
Self-powered ultraviolet (UV) photodetectors, which have vast applications in the military and for civilian purposes, have become particularly attractive in recent years due to their advantages of high sensitivity, ultrasmall size, and low power consumption. In particular, self-powered UV photodetectors driven by a built-in electric field cannot only detect UV signals but also be powered by the incident signals instead of external power. In this concept, the key issues and most recent developments on photovoltaic type UV photodetectors driven by p-n homojunction, heterojunction, and Schottky junction are surveyed...
September 19, 2017: Small
Kyu-Tae Lee, Ji-Yun Jang, Sang Jin Park, Song Ah Ok, Hui Joon Park
See-through perovskite solar cells with high efficiency and iridescent colors are demonstrated by employing a multilayer dielectric mirror. A certain amount of visible light is used for wide color gamut semitransparent color generation, which can be easily tuned by changing an angle of incidence, and a wide range of visible light is efficiently reflected back toward a photoactive layer of the perovskite solar cells by the dielectric mirror for highly efficient light-harvesting performance, thus achieving 10...
September 18, 2017: Nanoscale
Muzhen Xu, Hua Kang, Li Guan, Huayi Li, Meining Zhang
Wearable pressure sensors due to their portability and flexibility, have been attracting increasing attention for biomechanical monitoring. However, although great advances have been made by many efforts, the sensors with good performance produced by facile methods are insufficient. Here, we present a simple method for simple manufacturing one flexible and self-powered piezoelectric sensor based on LiNbO3 (LN) particles. The LN particles are dispersed in polypropylene (PP) doped with multi-walled carbon nanotubes (MWCNTs) through hot-pressing (200°C), forming LN/MWCNTs/PP piezoelectric composite film (PCF) flexible sensor...
September 13, 2017: ACS Applied Materials & Interfaces
Wei Tian, Huanping Zhou, Liang Li
Hybrid organic-inorganic perovskite materials garner enormous attention for a wide range of optoelectronic devices. Due to their attractive optical and electrical properties including high optical absorption coefficient, high carrier mobility, and long carrier diffusion length, perovskites have opened up a great opportunity for high performance photodetectors. This review aims to give a comprehensive summary of the significant results on perovskite-based photodetectors, focusing on the relationship among the perovskite structures, device configurations, and photodetecting performances...
September 12, 2017: Small
Nai-Jen Ku, Guocheng Liu, Chao-Hung Wang, Kapil Gupta, Wei-Shun Liao, Dayan Ban, Chuan-Pu Liu
Piezoelectric nanogenerators have been investigated to generate electricity from environmental vibrations due to their energy conversion capabilities. In this study, we demonstrate an optimal geometrical design of inertial vibration direct-current piezoelectric nanogenerators based on obliquely aligned InN nanowire (NW) arrays with an optimized oblique angle of ∼58°, and driven by the inertial force of their own weight, using a mechanical shaker without any AC/DC converters. The nanogenerator device manifests potential applications not only as a unique energy harvesting device capable of scavenging energy from weak mechanical vibrations, but also as a sensitive strain sensor...
September 12, 2017: Nanoscale
Ying Zhong, Zhisheng Chai, Zhimin Liang, Peng Sun, Weiguang Xie, Chuanxi Zhao, Wenjie Mai
Due to the popularity of the smart electronics, multi-functional energy storage devices, especially the electrochromic supercapacitors (SCs), have attracted tremendous research interests. Herein, a solid-state electrochromic asymmetric SC (ASC) window is designed and fabricated by introducing WO3 and polyaniline (PANI) as the negative and positive electrodes, respectively. The two complementary materials contribute to the outstanding electrochemical and electrochromic performances of the fabricated device. With an operating voltage window of 1...
September 8, 2017: ACS Applied Materials & Interfaces
Liangmin Jin, Juan Tao, Rongrong Bao, Li Sun, Caofeng Pan
The triboelectric nanogenerator (TENG) has great potential in the field of self-powered sensor fabrication. Recently, smart electronic devices and movement monitoring sensors have attracted the attention of scientists because of their application in the field of artificial intelligence. In this article, a TENG finger movement monitoring, self-powered sensor has been designed and analysed. Under finger movements, the TENG realizes the contact and separation to convert the mechanical energy into electrical signal...
September 5, 2017: Scientific Reports
Han Ouyang, Jingjing Tian, Guanglong Sun, Yang Zou, Zhuo Liu, Hu Li, Luming Zhao, Bojing Shi, Yubo Fan, Yifan Fan, Zhong Lin Wang, Zhou Li
Cardiovascular diseases are the leading cause of death globally; fortunately, 90% of cardiovascular diseases are preventable by long-term monitoring of physiological signals. Stable, ultralow power consumption, and high-sensitivity sensors are significant for miniaturized wearable physiological signal monitoring systems. Here, this study proposes a flexible self-powered ultrasensitive pulse sensor (SUPS) based on triboelectric active sensor with excellent output performance (1.52 V), high peak signal-noise ratio (45 dB), long-term performance (10(7) cycles), and low cost price...
September 1, 2017: Advanced Materials
Packiyaraj Perumal, Chelladurai Karuppiah, Wei-Cheng Liao, Yi-Rou Liou, Yu-Ming Liao, Yang-Fang Chen
Integrating different dimentional materials on vertically stacked p-n hetero-junctions have facinated a considerable scrunity and can open up excellent feasibility with various functionalities in opto-electronic devices. Here, we demonstrate that vertically stacked p-GaN/SiO2/n-MoS2/Graphene heterostructures enable to exhibit prominent dual opto-electronic characteristics, including efficient photo-detection and light emission, which represents the emergence of a new class of devices. The photoresponsivity was found to achieve as high as ~10...
August 30, 2017: Scientific Reports
Huidan Hou, Qingkai Xu, Yaokun Pang, Lei Li, Jiulin Wang, Chi Zhang, Chunwen Sun
Storing energy harvested by triboelectric nanogenerators (TENGs) from ambient mechanical motion is still a great challenge for achieving low-cost and environmental benign power sources. Here, an all-solid-state Na-ion battery with safe and durable performance used for efficient storing pulsed energy harvested by the TENG is demonstrated. The solid-state sodium-ion batteries are charged by galvanostatic mode and pulse mode with the TENG, respectively. The all-solid-state sodium-ion battery displays excellent cyclic performance up to 1000 cycles with a capacity retention of about 85% even at a high charge and discharge current density of 48 mA g(-1)...
August 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Shi Hyeong Kim, Carter S Haines, Na Li, Keon Jung Kim, Tae Jin Mun, Changsoon Choi, Jiangtao Di, Young Jun Oh, Juan Pablo Oviedo, Julia Bykova, Shaoli Fang, Nan Jiang, Zunfeng Liu, Run Wang, Prashant Kumar, Rui Qiao, Shashank Priya, Kyeongjae Cho, Moon Kim, Matthew Steven Lucas, Lawrence F Drummy, Benji Maruyama, Dong Youn Lee, Xavier Lepró, Enlai Gao, Dawood Albarq, Raquel Ovalle-Robles, Seon Jeong Kim, Ray H Baughman
Mechanical energy harvesters are needed for diverse applications, including self-powered wireless sensors, structural and human health monitoring systems, and the extraction of energy from ocean waves. We report carbon nanotube yarn harvesters that electrochemically convert tensile or torsional mechanical energy into electrical energy without requiring an external bias voltage. Stretching coiled yarns generated 250 watts per kilogram of peak electrical power when cycled up to 30 hertz, as well as up to 41.2 joules per kilogram of electrical energy per mechanical cycle, when normalized to harvester yarn weight...
August 25, 2017: Science
Dan Ruan, Rui Lin, Kui Jiang, Xiang Yu, Yaofeng Zhu, Yaqin Fu, Zilong Wang, He Yan, Wenjie Mai
Scalable manufacturing of flexible, fiber-shaped energy-storage devices has enabled great technological advances in wearable and portable technology. Replacing inefficient oxides with inexpensive and high-performance oxynitrides with more favorable three-dimensional (3D) structures is critical if the practical applications of these technologies are to be realized. Here, we developed a facile and controllable approach for the synthesis of 3D porous micropillars of molybdenum oxynitride (MON), which exhibit high conductivity, robust stability, and excellent energy-storage properties...
August 25, 2017: ACS Applied Materials & Interfaces
G M Hasan Ul Banna, Ii-Kyu Park
We report on the fabrication of ZnO nanorod (NR)-based flexible piezoelectric nanogenerators (PENGs) on carbon paper (CP). Structural investigations indicate that the ZnO NRs grew well along the porous CP surface. Optical investigation shows that the crystal quality of the ZnO NRs on the CP was comparable to that of NRs grown on Si substrate. As the molar concentration increased from 10 to 70 mM, and the output voltage and current increased consistently from 3.6 to 6.8 V and 0.79 to 1.45 μA, respectively. The enhancements of the voltage and current were attributed to the enhanced accumulation of the potentials generated by the increased number of series-connected ZnO NRs in the PENG devices...
August 15, 2017: Nanotechnology
Kai Yan, Yaohua Yang, Yuhan Zhu, Jingdong Zhang
A photocathode-based photocatalytic fuel cell (PFC) was fabricated and proposed as a self-powered sensor for p-nitrophenol (p-NP) detection. The PFC was comprised of a photocathode and an anode in separated chambers, which could generate suitable power output under photoirradiation to drive the sensing process. In this device, p-type PbS quantum dots-modified glass carbon electrode (GCE) served as the photocathode for the reduction of p-NP under photoirradiation while graphene-modified GCE was employed as the anode for the oxidation of ascorbic acid...
September 5, 2017: Analytical Chemistry
Zhiming Lin, Jun Chen, Xiaoshi Li, Zhihao Zhou, Keyu Meng, Wei Wei, Jin Yang, Zhong Lin Wang
Heart rate monitoring plays a critical role in personal healthcare management. A low-cost, non-invasive and user-friendly heart rate monitoring system is highly desirable. Here, a self-powered wireless Body Sensor Network (BSN) system is developed for heart rate monitoring via integration of a downy-structure based triboelectric nanogenerator (D-TENG), a power management circuit, a heart rate sensor, a signal processing unit and Bluetooth module for wireless data transmission. By converting the inertia energy of human walking into electric power, a maximum power of 2...
August 14, 2017: ACS Nano
You Yu, Junfeng Zhai, Yong Xia, Shaojun Dong
Wearable electronics are essential for the construction of epidermal energy supply and portable healthcare devices. Herein, a self-powered wearable electronic device based on a photoelectric biofuel cell has been introduced for the first time to simultaneously detect the perspiration lactate and monitor the ambient illuminance depending on independent parameters. The functions of harvesting energy, detection of body function and monitoring of ambient have been merged into a single wireless sensor. This novel design may provide a wide range of smart and exciting wearable electronics...
August 24, 2017: Nanoscale
Zhao Wang, Lun Tan, Xumin Pan, Gao Liu, Yahua He, Wenchao Jin, Meng Li, Yongming Hu, Haoshuang Gu
The rapid development of microscaled piezoelectric energy harvesters has provided a simple and highly efficient way for building self-powered sensor systems through harvesting the mechanical energy from the ambient environment. In this work, a self-powered microfluidic sensor that can harvest the mechanical energy of the fluid and simultaneously monitor their characteristics was fabricated by integrating the flexible piezoelectric poly(vinylidene fluoride) (PVDF) nanofibers with the well-designed microfluidic chips...
August 30, 2017: ACS Applied Materials & Interfaces
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