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Wenbo Li, Jiangjiang Duan, Junwen Zhong, Nan Wu, Shizhe Lin, Zisheng Xu, Shuwen Chen, Yuan Pan, Liang Huang, Bin Hu, Jun Zhou
Flexible pressure sensors possess promising applications in artificial electronic skin (e-skin), intelligence robot, wearable health monitoring, flexible physiological signal sensing, etc. Herein, we design a flexible pressure sensor with robust stability, high sensitivity and large linear pressure region based on tetrafluoroethylene-hexafluoropropylene-vinylide (THV) / cyclic olefin copolymer (COC) piezoelectret nanogenerator. According to the theoretical analysis for piezoelectret nanogenerators with imbalanced charge distribution, THV and COC are utilized to promote the electric field inside the piezoelectret for output voltage enhancement...
August 14, 2018: ACS Applied Materials & Interfaces
Tao Chen, Qiongfeng Shi, Kunpu Li, Zhan Yang, Huicong Liu, Lining Sun, Jan A Dziuban, Chengkuo Lee
Triboelectric nanogenerator (TENG) is a promising technology because it can harvest energy from the environment to enable self-sustainable mobile and wearable electronic devices. In this work, we present a flexible touch pad capable of detecting the contact location of an object and generating substantial energy simultaneously based on the coupling of triboelectric effects and electrostatic induction. The touch pad consists of Polytetrafluoroethylene (PTFE) thin film, multiple Aluminum (Al) electrodes and Polyethylene terephthalate (PET) layers, which can be achieved through low cost, simplified and scalable fabrication process...
August 13, 2018: Nanomaterials
Xiaoxiong Wang, Wei-Zhi Song, Ming-Hao You, Jun Zhang, Miao Yu, Zhiyong Fan, Seeram Ramakrishna, Yun-Ze Long
Moravec's paradox shows that low-level sensorimotor skills are more difficult than high-level reasoning in artificial intelligence and robotics area. So simplifying every sensing unit on electronic skin is critical for endowing intelligent robots with tactile and temperature sense. The human nervous system is characterized by efficient single-electrode signal transmission, ensuring the efficiency and reliability of information transmission under big data conditions. In this work, we report a sensor based on single-electrode piezoelectric nanogenerator (SPENG) by electrospun polyvinylidene fluoride(PVDF) nanofibers that can realize steady state sensing of pressure integrating cold/heat sensing on a single unit...
August 13, 2018: ACS Nano
Cheng Xu, Aurelia Chi Wang, Haiyang Zou, Binbin Zhang, Chunli Zhang, Yunlong Zi, Lun Pan, Peihong Wang, Peizhong Feng, Zhiqun Lin, Zhong Lin Wang
As previously demonstrated, contact-electrification (CE) is strongly dependent on temperature, however the highest temperature in which a triboelectric nanogenerator (TENG) can still function is unknown. Here, by designing and preparing a rotating free-standing mode Ti/SiO2 TENG, the relationship between CE and temperature is revealed. It is found that the dominant deterring factor of CE at high temperatures is the electron thermionic emission. Although it is normally difficult for CE to occur at temperatures higher than 583 K, the working temperature of the rotating TENG can be raised to 673 K when thermionic emission is prevented by direct physical contact of the two materials via preannealing...
August 9, 2018: Advanced Materials
Devin Pappas, Zacharias Fthenakis, Inna Ponomareva
Piezoelectric and ferroelectric nanowires exhibit properties and phases that are not available in the bulk. They are extremely promising for functional nanoscale application. On the basis of atomistic first-principles-based simulations, we predict an all-mechanical polarization control in ferroelectric nanowires. We report that the application of uniaxial compressive stress to ferroelectric nanowires with poor surface charge compensation leads to a reversible phase switching between the polar phase with axial polarization and macroscopically nonpolar flux-closure phase...
August 8, 2018: Nano Letters
Yujia Zhang, Zhitao Zhou, Zhen Fan, Shaoqing Zhang, Faming Zheng, Keyin Liu, Yulong Zhang, Zhifeng Shi, Liang Chen, Xinxin Li, Ying Mao, Fei Wang, Yun-Lu Sun, Tiger H Tao
Controllable degradation and excellent biocompatibility during/after a lifetime endow emerging transient electronics with special superiority in implantable biomedical applications. Currently, most of these devices need external power sources, limiting their real-world utilizations. Optimizing existing bioresorbable electronic devices requires natural-material-based construction and, more importantly, diverse or even all-in-one multifunctionalization. Herein, silk-based implantable, biodegradable, and multifunctional systems, self-powered with transient triboelectric nanogenerators (T2 ENGs), for real-time in vivo monitoring and therapeutic treatments of epileptic seizures, are reported...
August 5, 2018: Small
Weichao Wang, Jiancheng Xu, Haiwu Zheng, Fangqi Chen, Kory Jenkins, Yonghui Wu, Heyi Wang, Weifeng Zhang, Rusen Yang
With the rapid development of portable electronics, exploring sustainable power sources is becoming more and more urgent. Utilizing a nanogenerator to harvest ambient mechanical energy could be an effective approach to solve this challenge. In this work, a novel spring-assisted hybrid nanogenerator (HG) consisting of a triboelectric nanogenerator (TENG) and an electromagnetic generator (EMG) was developed for harvesting low-frequency vibration energy. The results show that the TENG with a PTFE surface nanostructure has better output performance than that without the nanostructure...
August 2, 2018: Nanoscale
Aimin Wei, Xinkai Xie, Zhen Wen, Hechuang Zheng, Huiwen Lan, Huiyun Shao, Xuhui Sun, Jun Zhong, Shuit-Tong Lee
Hematite is one of the most promising photoanodes for photoelectrochemical (PEC) solar water splitting. However, due to the low conduction band position for water reduction, an external bias is necessarily required with the consumption of extra power. In this work, a titanium modified hematite (Ti-Fe2 O3 ) photoanode-based self-powered PEC water splitting system in tandem with a rotatory disc-shaped triboelectric nanogenerator (RD-TENG) has been developed. It is a fantastic strategy to effectively drive the hematite-based PEC water splitting by using the environmental mechanical energy through a TENG...
July 25, 2018: ACS Nano
Libo Gao, Jian Song, James Utama Surjadi, Ke Cao, Ying Han, Dong Sun, Xiaoming Tao, Yang Lu
Portable fiber supercapacitors with high-energy storage capacity are in great demand to cater for the rapid development of flexible and deformable electronic devices. Hence, we employed a 3D cellular copper foam (CF) combined with the graphene sheets (GSs) as the support matrix to bridge the active material with nickel fiber (NF) current collector, significantly increasing surface area and decreasing the interface resistance. In comparison to the active material directly growing onto the NF in the absence of CF and GSs, our rationally designed architecture achieved a joint improvement in both capacity (0...
August 2, 2018: ACS Applied Materials & Interfaces
Yuxing Liang, Shuaiqi Fan, Xuedong Chen, Yuantai Hu
In piezoelectric semiconductors, electric fields drive carriers into motion/redistribution, and in turn the carrier motion/redistribution has an opposite effect on the electric field itself. Thus, carrier drift in a piezoelectric semiconducting structure is essentially nonlinear unless the induced fluctuation of carrier concentration is very small. In this paper, the nonlinear governing equation of carrier concentration was established by coupling both piezoelectric effect and semiconduction. A nonlinear carrier-drift effect on the performance of a ZnO nanogenerator was investigated in detail and it was elucidated that carrier motion/redistribution occurs in the ZnO nanowire (ZNW) cross section while there is no carrier motion in the axial direction...
2018: Beilstein Journal of Nanotechnology
Bin Yu, Hao Yu, Tao Huang, Hongzhi Wang, Bimeng Zhang, Meifang Zhu
A triboelectric nanogenerator (TENG) shows great promise for the energy of the new era. In this study, we present a triboelectric nanogenerator array assembled with multiple asymmetric-layer-based triboelectric units with a sinusoidal alternating output. It raises the possibility that large-scale triboelectric energy may be developed as an alternative energy source. Moreover, we systematically analyzed the device operation to show that the internal capacitance effect controlled the output waveforms. Finally, by tuning the internal capacitance, a TENG array with performances of both stable sinusoidal alternating output and high power density is obtained based on the quantitative evaluations...
July 19, 2018: Nanoscale
Tao Chen, Qiongfeng Shi, Zhan Yang, Jinchang Liu, Huicong Liu, Lining Sun, Chengkuo Lee
Triboelectric nanogenerators (TENGs) are highly promising because they can scavenge energy from their working environment to sustainably power wearable/mobile electronics. In this work, we propose a novel and straightforward strategy for six-axis force detection and object controlling by using a self-powered sensor based on TENG. The self-powered sensor can be used in diversified tactile sensing and energy saving applications, which has been demonstrated to be able to detect normal force in the range of 0⁻18 N...
July 6, 2018: Nanomaterials
Viyada Harnchana, Huynh Van Ngoc, Wen He, Aamir Rasheed, Hyunje Park, Vittaya Amornkitbamrung, Dae Joon Kang
In this work, a new approach to modifying poly(dimethylsiloxane) (PDMS) as a negative triboelectric material using graphene oxide (GO) and a sodium dodecyl sulfate (SDS) surfactant was reported. A porous PDMS@GO@SDS composite triboelectric nanogenerator (TENG) could deliver an output voltage and current of up to 438 V and 11 μA/cm2 , respectively. These values were 3-fold higher than those of the flat PDMS. The superior performance is attributed to the intensified negative charges on PDMS from the oxygen functional groups of GO and anionic head groups of the SDS molecules...
August 1, 2018: ACS Applied Materials & Interfaces
Ji-Su Im, Il-Kyu Park
Mechanically robust composite nanofibers (NFs) with enhanced magnetic properties were made from polyvinylidene fluoride (PVDF) and Fe3 O4 nanoparticles (NPs) by an electrospinning method. At up to 11.3 wt %, Fe3 O4 NPs were embedded randomly in the PVDF NFs, but when the content exceeded 17 wt %, the NPs aggregated on the NF surfaces. Magnetization of the composite NFs consistently increased with the increasing Fe3 O4 NP content. The mechanical strength of the Fe3 O4 NP/PVDF composite NF was enhanced by a dispersion strengthening mechanism...
August 1, 2018: ACS Applied Materials & Interfaces
Xinyu Du, Yuebo Liu, Jiaona Wang, Huidan Niu, Zuqing Yuan, Shuyu Zhao, Xiuling Zhang, Ran Cao, Yingying Yin, Nianwu Li, Chi Zhang, Yi Xing, Weihua Xu, Congju Li
Core-shell-structured BaTiO3 -poly( tert-butyl acrylate) (P tBA) nanoparticles are successfully prepared by in situ atom transfer radical polymerization of tert-butyl acrylate ( tBA) on BaTiO3 nanoparticle surface. The thickness of the P tBA shell layer could be controlled by adjusting the feed ratio of tBA to BaTiO3 . The BaTiO3 -P tBA nanoparticles are introduced into poly(vinylidene fluoride) (PVDF) matrix to form a BaTiO3 -P tBA/PVDF nanocomposite. The nanocomposites keep the flexibility of the PVDF matrix with enhanced dielectric constant (∼15@100 Hz) because of the high permittivity of inorganic particles and the ester functional groups in the P tBA...
August 1, 2018: ACS Applied Materials & Interfaces
Moonjeong Bok, Yunwoo Lee, Daehoon Park, Sangho Shin, Zhi-Jun Zhao, Boyeon Hwang, Soon Hyoung Hwang, So Hee Jeon, Joo-Yun Jung, Sung Ha Park, Junghyo Nah, Eunju Lim, Jun-Ho Jeong
In this study, a combined system of microneedles and a triboelectric nanogenerator (TENG) has been developed for drug delivery. A triboelectric device, which converts mechanical energy into alternating current (AC), was chosen to replace the electrophoresis (EP) effect. To directly generate triboelectricity from salmon deoxyribonucleic acid (SDNA)-based microneedles, a triboelectric series of SDNA film and chargeable polymers (polyimide and Teflon) was studied. The electrical output of the two charged polymers was compared to find a material that could be highly charged with SDNA...
July 19, 2018: Nanoscale
Yudong Liu, Yaxing Zhu, Jingyu Liu, Yang Zhang, Juan Liu, Junyi Zhai
Sensorineural hearing loss tops the list of most suffering disease for the sake of its chronic, spirit pressing, and handicapped features, which can happen to all age groups, from newborns to old folks. Laggard technical design as well as external power dependence of conventional cochlear implant cumbers agonized patients and restrict its wider practical application, driving researchers to seek for fundamental improvement. In this paper, we successfully proposed a novel bionic cochlear basilar membrane acoustic sensor in conjugation with triboelectric nanogenerator...
July 3, 2018: Nanoscale Research Letters
Lihua Xu, Guihua Tong, Qiaoli Song, Chunyu Zhu, Hongling Zhang, Jinjin Shi, Zhenzhong Zhang
Breast cancer therapy has always been a hard but urgent issue. Disruption of mitochondrial Ca2+ homeostasis has been reported as an effective antitumor strategy, while how to contribute to mitochondrial Ca2+ overload effectively is a critical issue. To solve this issue, we designed and engineered a dual enhanced Ca2+ nanogenerator (DECaNG), which can induce elevation of intracellular Ca2+ through the following three ways: Calcium phosphate (CaP)-doped hollow mesoporous copper sulfide was the basic Ca2+ nanogenerator to generate Ca2+ directly and persistently in the lysosomes (low pH)...
July 24, 2018: ACS Nano
Daewoong Hong, Young-Man Choi, Jaehwa Jeong
The triboelectric nanogenerator (TENG) has become one of the strongest candidates for sustainable power sources. The power of a TENG depends on factors such as contact area, contact parallelism, contact force, and contact speed. In order to evaluate the performance of the TENG precisely and quantitatively, it is necessary to apply consistent experimental conditions and measurement processes. In this paper, we propose a test bed capable of adjusting the contact area and contact parallelism and measuring the contact force, contact speed, current, and voltage in real time...
June 2018: Review of Scientific Instruments
Bhaskar Dudem, Dong Hyun Kim, Anki Reddy Mule, Jae Su Yu
Triboelectric nanogenerator (TENG) technology is an emerging field to harvest various kinds of mechanical energies available in our living environment. Nowadays, for industrial and large-scale area applications, developing the TENG with low device processing cost and high electrical output is a major issue to be resolved. Herein, we designed a TENG with low cost by employing the microgrooved architectured (MGA)-poly(tetrafluoroethylene) (PTFE; Teflon) and aluminum as triboelectric materials with opposite tendencies...
July 18, 2018: ACS Applied Materials & Interfaces
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