24 results found
Shi M, Yeatman EM, 2021, A comparative review of artificial muscles for microsystem applications, Microsystems and Nanoengineering, Vol: 7, Pages: 1-19, ISSN: 2055-7434
Artificial muscles are capable of generating actuation in microsystems with outstanding compliance. Recent years have witnessed a growing academic interest in artificial muscles and their application in many areas, such as soft robotics and biomedical devices. This paper aims to provide a comparative review of recent advances in artificial muscle based on various operating mechanisms. The advantages and limitations of each operating mechanism are analyzed and compared. According to the unique application requirements and electrical and mechanical properties of the muscle types, we suggest suitable artificial muscle mechanisms for specific microsystem applications. Finally, we discuss potential strategies for energy delivery, conversion, and storage to promote the energy autonomy of microrobotic systems at a system level.
Shi M, Holmes AS, Yeatman EM, 2021, NONLINEAR WIND ENERGY HARVESTING BASED ON MECHANICAL SYNCHRONOUS SWITCH HARVESTING ON INDUCTOR, 21st International Conference on Solid-State Sensors, Actuators and Microsystems (Transducers), Publisher: IEEE, Pages: 964-967, ISSN: 2167-0013
Shi M, Holmes AS, Yeatman EM, 2021, Stretchable Piezoelectric Tensile Sensor Patterned via Ultraviolet Laser Cutting, 20th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS), Publisher: IEEE, Pages: 8-11
Shi M, Holmes A, Yeatman E, 2020, Piezoelectric wind velocity sensor based on the variation of galloping frequency with drag force, Applied Physics Letters, Vol: 116, ISSN: 0003-6951
In this paper, we demonstrate a miniature energy harvesting wind velocity sensor of simple, low-cost construction, based on a single-degree-of-freedom galloping structure. The sensor consists of a prismatic bluff body with a triangular cross section attached to the free end of acantilever incorporating a commercial polyvinylidene fluoride piezoelectric film. In the wind, the bluff body causes vibration of the cantileverbased on galloping, and the piezoelectric film converts the vibration energy into an electrical signal. We have observed a negative correlationbetween the wind velocity and the vibration frequency, and we demonstrate that this relationship can be used to detect wind velocity directlywith useful accuracy. A simple theoretical model indicates that the frequency shift can be accounted for by the effect of the axial loading dueto form drag. The model shows close agreement with the experimental results. In wind tunnel tests, a prototype wind velocity sensor basedon this principle could measure wind velocities from 4.45 to 10 m/s, with the measured velocity typically being within 4% of the referencevalue obtained using a Pitot tube.
Shi M, Wu H, 2019, Flexible and stretchable electronic skin, Flexible and Stretchable Triboelectric Nanogenerator Devices: Toward Self-powered Systems, Pages: 281-303, ISBN: 9783527345724
Electronic skin is a kind of flexible, film-shaped electronic device which can perceive various environmental stimulations analogous to that of the human skin. This chapter aims to introduce the progress in e-skin based on triboelectric effect. The design of e-skin is based on the understanding and imitation of real human skin. The sensing capability of e-skin can be roughly divided into two parts: mechanical and physiological. There are two strategies to realize in self-powered physiological monitoring. The first is energizing the commercial low-power sensors with TENG, while the second is sensing the physiological indicators through analyzing the electrical output properties of TENG directly. As a smart device to sense the mechanical stimulation from the environment, e-skin can be used in detecting pressure, strain, sliding, bending, and location. Meanwhile, when it is used to seamlessly monitor physiological signals, more factors should be considered, like signal transmission mechanism and reliability, besides functions.
Shi M, Wu H, 2019, Applications in internet of things and artificial intelligence, Flexible and Stretchable Triboelectric Nanogenerator Devices: Toward Self-powered Systems, Pages: 359-378, ISBN: 9783527345724
With the rapid development of internet of things (IoT) and artificial intelligence (AI), how to continuously and reliably energize numerous distributed electronic components, especially sensors, in these complex systems has become a critical problem. Triboelectric nanogenerator (TENG) have been widely used to establish self-powered sensing nodes in the IoT, which can work as energy harvesting power sources as well as self-powered sensors. Considering the widely distributed sensor nodes in the IoT, wireless communication is competitive compared to wired transmission. A power management circuit is critical for self-powered applications in the IoT. There are three problems for the application of the TENG because of the special electrical properties of the nanogenerator. Flexible and stretchable self-powered smart systems provide unprecedented opportunities for applications in AI, including electronic skins, robotic prosthetics, and human-machine interface.
Shi M, Yeatman EM, Holmes AS, 2019, Energy Harvesting Piezoelectric Wind Speed Sensor, 18th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications, Publisher: IOP PUBLISHING LTD, ISSN: 1742-6588
Wu H, Guo H, Su Z, et al., 2018, Fabric-based self-powered noncontact smart gloves for gesture recognition, JOURNAL OF MATERIALS CHEMISTRY A, Vol: 6, Pages: 20277-20288, ISSN: 2050-7488
Wu H, Su Z, Shi M, et al., 2018, Self-Powered Noncontact Electronic Skin for Motion Sensing, ADVANCED FUNCTIONAL MATERIALS, Vol: 28, ISSN: 1616-301X
Shi M, Wu H, Zhang J, et al., 2017, Self-powered wireless smart patch for healthcare monitoring, NANO ENERGY, Vol: 32, Pages: 479-487, ISSN: 2211-2855
Wang H, Shi MY, Zhu K, et al., 2016, Fabrication of stretchable and flexible vertically aligned carbon nanotube film, Pages: 482-485
This paper presents a cost-effective method to transfer vertically aligned carbon nanotubes (VA-CNTs) with Poly(dimethylsiloxane) (PDMS). Here, in this process, we take the advantage of PDMS solution as the transfer medium, meanwhile utilize the good wetting of this solution on another cured PDMS film to realize efficient transfer. The SEM images of transferred CNTs were taken to characterize the surface properties and verify the quality of fabrication. It shows high quality VA-CNT film with notable stretchability and flexibility was obtained by this simple method. The well aligned PDMS films with proper as-grown CNTs have a broad potential to be utilized in numbers of novel nanodevices, such as gas sensor, supercapacitor and nanogenerator, etc.
Wang H, Shi M, Zhu K, et al., 2016, High performance triboelectric nanogenerators with aligned carbon nanotubes, Nanoscale, Vol: 8, Pages: 18489-18494, ISSN: 2040-3364
As the essential element of a triboelectric nanogenerator (TENG), friction layers play key roles that determine the device performance, which can be enhanced by material selection and surface modification. In this work, we have embedded aligned carbon nanotubes (CNTs) on the polydimethylsiloxane (PDMS) surface as the effective dielectric layer to donate electrons. This layer not only increases the electron generation for the output, but also shows notable stretchability. The length and the properties of the aligned CNTs can be controlled precisely. Using the 40 μm CNT as an example, the fabricated CNT–PDMS TENG shows an output voltage of 150 V and a current density of 60 mA m−2, which are 250% and 300% enhancement compared to the TENG using directly doped PDMS/multiwall carbon nanotubes, respectively. The maximum power density of this TENG reaches 4.62 W m−2 at an external load of 30 MΩ. The TENG has demonstrated superior stability during cyclic measurement of over 12 000 cycles. Besides, the aligned CNT–PDMS film shows superhydrophobicity (154°) and good sheet resistance of 280 Ω sq−1. This stretchable aligned CNT–PDMS film can be universally utilized as a positive triboelectric layer pairing with polymeric materials such as polyethylene terephthalate, polyimide, PDMS and polytetrafluoroethylene for TENGs. This work provides an effective method of structure design for flexible and stretchable nanogenerators.
Shankaregowda SA, Nanjegowda CB, Cheng X-L, et al., 2016, A Flexible and Transparent Graphene-Based Triboelectric Nanogenerator, IEEE TRANSACTIONS ON NANOTECHNOLOGY, Vol: 15, Pages: 435-441, ISSN: 1536-125X
The progress of smart skin technology presents unprecedented opportunities for artificial intelligence. Resolution enhancement and energy conservation are critical to improve the perception and standby time of robots. Here, we present a self-powered analogue smart skin for detecting contact location and velocity of the object, based on a single-electrode contact electrification effect and planar electrostatic induction. Using an analogue localizing method, the resolution of this two-dimensional smart skin can be achieved at 1.9 mm with only four terminals, which notably decreases the terminal number of smart skins. The sensitivity of this smart skin is remarkable, which can even perceive the perturbation of a honey bee. Meanwhile, benefiting from the triboelectric mechanism, extra power supply is unnecessary for this smart skin. Therefore, it solves the problems of batteries and connecting wires for smart skins. With microstructured poly(dimethylsiloxane) films and silver nanowire electrodes, it can be covered on the skin with transparency, flexibility, and high sensitivity.
Cheng X, Meng B, Chen X, et al., 2016, Single-Step Fluorocarbon Plasma Treatment-Induced Wrinkle Structure for High-Performance Triboelectric Nanogenerator, SMALL, Vol: 12, Pages: 229-236, ISSN: 1613-6810
Shi M, Zhang J, Han M, et al., 2016, A SINGLE-ELECTRODE WEARABLE TRIBOELECTRIC NANOGENERATOR BASED ON CONDUCTIVE & STRETCHABLE FABRIC, 29th IEEE International Conference on Micro Electro Mechanical Systems (MEMS), Publisher: IEEE, Pages: 1228-1231, ISSN: 1084-6999
Zhang J, Shi M, Chen H, et al., 2016, ULTRA-SENSITIVE TRANSPARENT AND STRETCHABLE PRESSURE SENSOR WITH SINGLE ELECTRODE, 29th IEEE International Conference on Micro Electro Mechanical Systems (MEMS), Publisher: IEEE, Pages: 173-176, ISSN: 1084-6999
Cheng X, Chen X, Meng B, et al., 2016, A FLEXIBLE AND WEARABLE GENERATOR WITH FLUOROCARBON PLASMA INDUCED WRINKLE STRUCTURE, 29th IEEE International Conference on Micro Electro Mechanical Systems (MEMS), Publisher: IEEE, Pages: 1181-1184, ISSN: 1084-6999
Han M, Yu B, Qiu G, et al., 2015, Electrification based devices with encapsulated liquid for energy harvesting, multifunctional sensing, and self-powered visualized detection, JOURNAL OF MATERIALS CHEMISTRY A, Vol: 3, Pages: 7382-7388, ISSN: 2050-7488
Cheng X, Meng B, Han M, et al., 2015, Floor-based Large-area Triboelectric Generator for Active Security Monitoring, IEEE International Conference on Consumer Electronics (ICCE), Publisher: IEEE, Pages: 581-582, ISSN: 2158-3994
Shankaregowda SA, Nanjegowda CB, Cheng X, et al., 2015, A Flexible and Transparent Graphene Based Triboelectric Nanogenerator, IEEE NANO 2015 15th INTERNATIONAL CONFERENCE ON NANOTECHNOLOGY, Publisher: IEEE, Pages: 1477-1480
Han M, Meng B, Cheng X, et al., 2015, A keyboard-based r-shaped triboelectric generator for active noise-free recording, Pages: 29-34, ISSN: 0272-9172
This paper presents a method for noise-free recording of the keyboard-based musical instruments. By integrating an r-shaped triboelectric generator (TEG) into the keyboard of a piano, it can produce electric signal while playing music due to the combination of contact electrification and electric induction. We investigated the electric signal and developed a graphical user interface to convert the electric signal back to music. Using the piano and the graphical user interface, active noise-free recording can be realized. Namely, only the sound produced by the piano can be converted and recorded, while other noise in the environment can be filtered automatically.
Han M, Meng B, Cheng X, et al., 2015, A Keyboard-Based r-Shaped Triboelectric Generator for Active Noise-Free Recording, MRS Proceedings, Vol: 1782, Pages: 29-34, ISSN: 0272-9172
<jats:title>ABSTRACT</jats:title><jats:p>This paper presents a method for noise-free recording of the keyboard-based musical instruments. By integrating an r-shaped triboelectric generator (TEG) into the keyboard of a piano, it can produce electric signal while playing music due to the combination of contact electrification and electric induction. We investigated the electric signal and developed a graphical user interface to convert the electric signal back to music. Using the piano and the graphical user interface, active noise-free recording can be realized. Namely, only the sound produced by the piano can be converted and recorded, while other noise in the environment can be filtered automatically.</jats:p>
Yang Z, Wang M, Shi M, et al., 2012, Optical Properties of Silver Nanocrystal Synthesized by a New Srategies Experiments Supported by DDA Calculation, 12th IEEE International Conference on Nanotechnology (IEEE-NANO), Publisher: IEEE
This data is extracted from the Web of Science and reproduced under a licence from Thomson Reuters. You may not copy or re-distribute this data in whole or in part without the written consent of the Science business of Thomson Reuters.