CAS Beijing Institute of Nanoenergy and Nanosystems

Beijing, China

CAS Beijing Institute of Nanoenergy and Nanosystems

Beijing, China
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Patent
CAS Beijing Institute of Nanoenergy and Nanosystems | Date: 2017-02-22

The disclosure provides an electrostatic induction based sensor and generator, as well as sensing method and method of generating electricity thereof. A sensing component of the sensor comprises a first electrode layer and a second electrode layer associated therewith, the first electrode layer and the second electrode layer are separately disposed and electrically connected to each other. When the sensing component and the object to be detected are combined to be an integrity, they constitute the generator of the present disclosure. When the object to be detected moves relative to the first electrode layer of the sensing component, electric potential on the first electrode layer generated by charges carried by the sensing component changes and charges flow between the first electrode layer and the second electrode layer under the electrostatic induction effect to generate a current. The sensor or generator of the present disclosure has a simple structure. There is no need to provide an external power supply when used as a sensor.


Patent
CAS Beijing Institute of Nanoenergy and Nanosystems | Date: 2017-02-15

The present disclosure provides a triboelectric nanogenerator and a method of generating electricity that collects mechanical energy of liquid. The triboelectric nanogenerator includes an electricity generation component and a friction layer that covers the electricity generation component that are prepared on a substrate, wherein the electricity generation component consists of a first electrode layer and a second electrode layer that are separately disposed in a direction of fluctuation or flow of the liquid and are electrically connected to each other. The liquid frictionates with the friction layer when it fluctuates or flows, such that a surface of the friction layer in contact with the liquid carries charges. The charges on the surface of the friction layer corresponding to the two electrode layers are sequentially shielded by ions in the liquid as the liquid flows or fluctuates, which results in a flow of induced charges between the first electrode layer and the second electrode layer. It is not necessary for the two electrode layers in the electricity generation component to move as the liquid fluctuates, ensuring the life of the generator. The generator in the present disclosure provides characteristics of light weight, small size, simple structure and low cost and facilitates scale production and installation.


Patent
CAS Beijing Institute of Nanoenergy and Nanosystems | Date: 2015-08-12

The present invention provides a contact electrification effect-based back gate field-effect transistor. The back gate field-effect transistor includes: a conductive substrate; an insulating layer formed on a front face of the conductive substrate; a field-effect transistor assembly including: a channel layer, a drain and a source, and a gate; and a triboelectric nanogenerator assembly including: a static friction layer formed at a lower surface of the gate, a movable friction layer disposed opposite to the static friction layer and separated by a preset distance, and a second electro-conductive layer formed at an outside of the movable friction layer and being electrically connected to the source; wherein, the static friction layer and the movable friction layer are made of materials in different ratings in triboelectric series, and the static friction layer and the movable friction layer are switchable between a separated state and a contact state under the action of an external force.


Patent
CAS Beijing Institute of Nanoenergy and Nanosystems | Date: 2017-06-21

The present invention provides a contact electrification effect-based back gate field-effect transistor. The back gate field-effect transistor includes: a conductive substrate; an insulating layer formed on a front face of the conductive substrate; a field-effect transistor assembly including: a channel layer, a drain and a source, and a gate; and a triboelectric nanogenerator assembly including: a static friction layer formed at a lower surface of the gate, a movable friction layer disposed opposite to the static friction layer and separated by a preset distance, and a second electro-conductive layer formed at an outside of the movable friction layer and being electrically connected to the source; wherein, the static friction layer and the movable friction layer are made of materials in different ratings in triboelectric series, and the static friction layer and the movable friction layer are switchable between a separated state and a contact state under the action of an external force. The present invention achieves regulation and control of carrier transport properties in semiconductors by using an electrostatic potential generated in a triboelectric nanogenerator as a gate signal of the back gate field-effect transistor.


Wang Z.L.,Georgia Institute of Technology | Wang Z.L.,CAS Beijing Institute of Nanoenergy and Nanosystems
ACS Nano | Year: 2013

Triboelectrification is an effect that is known to each and every one probably since ancient Greek time, but it is usually taken as a negative effect and is avoided in many technologies. We have recently invented a triboelectric nanogenerator (TENG) that is used to convert mechanical energy into electricity by a conjunction of triboelectrification and electrostatic induction. As for this power generation unit, in the inner circuit, a potential is created by the triboelectric effect due to the charge transfer between two thin organic/inorganic films that exhibit opposite tribo-polarity; in the outer circuit, electrons are driven to flow between two electrodes attached on the back sides of the films in order to balance the potential. Since the most useful materials for TENG are organic, it is also named organic nanogenerator, which is the first using organic materials for harvesting mechanical energy. In this paper, we review the fundamentals of the TENG in the three basic operation modes: vertical contact-separation mode, in-plane sliding mode, and single-electrode mode. Ever since the first report of the TENG in January 2012, the output power density of TENG has been improved 5 orders of magnitude within 12 months. The area power density reaches 313 W/m2, volume density reaches 490 kW/m3, and a conversion efficiency of ∼60% has been demonstrated. The TENG can be applied to harvest all kinds of mechanical energy that is available but wasted in our daily life, such as human motion, walking, vibration, mechanical triggering, rotating tire, wind, flowing water, and more. Alternatively, TENG can also be used as a self-powered sensor for actively detecting the static and dynamic processes arising from mechanical agitation using the voltage and current output signals of the TENG, respectively, with potential applications for touch pad and smart skin technologies. To enhance the performance of the TENG, besides the vast choices of materials in the triboelectric series, from polymer to metal and to fabric, the morphologies of their surfaces can be modified by physical techniques with the creation of pyramid-, square-, or hemisphere-based micro-or nanopatterns, which are effective for enhancing the contact area and possibly the triboelectrification. The surfaces of the materials can be functionalized chemically using various molecules, nanotubes, nanowires, or nanoparticles, in order to enhance the triboelectric effect. The contact materials can be composites, such as embedding nanoparticles in a polymer matrix, which may change not only the surface electrification but also the permittivity of the materials so that they can be effective for electrostatic induction. Therefore, there are numerous ways to enhance the performance of the TENG from the materials point of view. This gives an excellent opportunity for chemists and materials scientists to do extensive study both in the basic science and in practical applications. We anticipate that a better enhancement of the output power density will be achieved in the next few years. The TENG is possible not only for self-powered portable electronics but also as a new energy technology with potential to contribute to the world energy in the near future. © 2013 American Chemical Society.


Patent
CAS Beijing Institute of Nanoenergy and Nanosystems | Date: 2016-01-20

This present invention provides a sliding triboelectric nanogenerator. The triboelectric nanogenerator comprises a first friction layer (10), a first conductive element (11) disposed in contact with the lower part of the first friction layer, a second friction layer (20), and a second conductive element (21) disposed in contact with the upper part of the second friction layer, wherein the upper surface of the first friction layer is disposed oppositely to the lower surface of the second friction layer; and the upper surface of the first friction layer and the lower surface of the second friction layer perform relative sliding friction tangent to the contact face under the action of an external force while the friction area varies in the process of sliding, and an electrical signal is output to an external circuit by the first conductive element and the second conductive element. When a periodic tangential external force is applied to the sliding triboelectric nanogenerator, an alternating pulse signal output may be formed between the first conductive element and the second conductive element.


Patent
CAS Beijing Institute of Nanoenergy and Nanosystems | Date: 2016-01-20

This present invention provides a sliding triboelectric nanogenerator and a power generation method. The sliding triboelectric nanogenerator comprises a conductive layer (20), a friction layer (10), and a conductive element (11) disposed in contact with the lower part of the friction layer, wherein the upper surface of the friction layer is disposed oppositely to the lower surface of the conductive layer, and the upper surface of the friction layer and the lower surface of the conductive layer perform relative sliding friction tangent to the contact face under the action of an external force while the friction area varies in the process of sliding, and an electrical signal is output to an external circuit by the conductive element and the conductive layer. When a periodic tangential external force is applied to the sliding triboelectric nanogenerator, an alternating pulse signal output may be formed between the conductive element and the conductive layer.


Patent
CAS Beijing Institute of Nanoenergy and Nanosystems | Date: 2016-06-22

A single-electrode touch sensor and manufacturing method thereof are disclosed. Different triboelectric properties of materials of a touch action provider and a touch layer are utilized to provide the single-electrode self-driven touch sensor. When the touch action provider applies a touch-and-separate action or a sliding action on the touch layer, an electrical signal generating mechanism will be triggered and the sensor outputs an electrical signal automatically, such that the touch action will be recorded and fed back, thereby a sensing function is realized. The single-electrode touch sensor of this disclosure may record touch actions in real time, has advantages of low cost, self-driven, simple structure and the like, and will have a wide application prospect in fields of smart electronic equipment and man-machine interfaces.


Patent
CAS Beijing Institute of Nanoenergy and Nanosystems | Date: 2016-04-20

The present invention provides a single-electrode triboelectric nanogenerator based on different triboelectric properties of polymer material and metal material, and further provides a tracking system based on the nanogenerator. The tracking system comprises an array formed by a plurality of nanogenerators; when an object moves on the tracking system, a pressure is applied on the nanogenerator causing two layers of triboelectric material constituting the nanogenerator to contact with each other and thereby outputting an electrica signal. When the object has left the nanogenerator, the two layers of the triboelectric material constituting the nanogenerator are separated from each other under the action of an elastic material and output an electrical signal as well. The tracking system based on the triboelectric nanogenerator according to the invention may track the movement path of certain objects, and has advantages of self-driven, low cost, and simple structure.


Patent
CAS Beijing Institute of Nanoenergy and Nanosystems | Date: 2016-05-04

The present disclosure provides a sliding-mode triboelectric generator and a method of power generation. The sliding-mode triboelectric generator comprises: a friction layer (100) and an electrode layer (200), wherein the electrode layer (200) is electrically connected to an isopotential (300). An electrical signal is outputted between the electrode layer and the isopotential when a relative sliding occurs, under the action of an external force, between the upper surface of the electrode layer and the lower surface of the friction layer while a friction area changes in the course of the sliding. Correspondingly, the present disclosure provides a vector displacement sensor where the sliding-mode triboelectric generator is applied, wherein the electrode layer is formed of a plurality of sub-electrodes (231, 232, 233, 234). When a moving object (140) slides on the electrode layer, a position, a moving direction and a moving distance of the moving object is detectable in accordance with the electrical signal outputted between the sub-electrodes and the isopotential. No power supply is required for the sensor.

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