KR-20260066889-A - A SILK-BASED MOISTURE-ELECTRO-TRIBO-ELECTRIC GENERATOR CAPABLE OF DUAL-MODE SELF-POWERED TACTILE SENSING

Abstract

A silk-based moisture-electric triboelectric generator capable of dual-mode self-powered tactile sensing is disclosed. A moisture and triboelectric generator used in the generator may have a laminated structure comprising: a first electrode; a moisture generation layer formed on the first electrode and generating power from moisture; a second electrode formed on the moisture generation layer; a first friction layer formed on the second electrode and having at least one hollow; a second friction layer formed on the first friction layer; and a third electrode formed on the second friction layer.

Inventors

• 박철민
• 이승유
• 짠광터
• 조카이잉
• 김관호

Assignees

• 연세대학교 산학협력단

Dates

Publication Date

20260512

Application Date

20241105

Claims (15)

1. First electrode; A moisture power generation layer formed on the first electrode and generating power from moisture; A second electrode formed on the above moisture generation layer; A first friction layer formed on the second electrode and having at least one hollow formed therein; A second friction layer formed on the first friction layer; and A laminated structure comprising a third electrode formed on the second friction layer; In the above moisture generation layer, a potential gradient occurs due to a difference in wettability or moisture between the portion in contact with the first electrode and the portion in contact with the second electrode, and The potential gradient generated from the moisture power generation layer through the first electrode and the second electrode is obtained as electrical energy, and The first friction layer and the second friction layer generate triboelectric energy through repeated contact and separation, and Obtaining the triboelectric energy through the second electrode and the third electrode, Moisture and triboelectric generator.
2. In paragraph 1, A sealing portion further comprising closing the side of the above-mentioned laminated structure Moisture and triboelectric generator.
3. In paragraph 2, The above sealing portion closes the side of the laminated structure with tape, and The first electrode, the second electrode, and the third electrode are electrically connected to the outside through a conductive line passing through the sealing portion. Moisture and triboelectric generator.
4. In paragraph 1, The first electrode, the second electrode, and the third electrode comprise an indium tin compound (ITO) or aluminum. Moisture and triboelectric generator.
5. In paragraph 1, The above moisture generation layer comprises Silk Fibroin-Phytic Acid-Glycerol (SF-PA-G), Moisture and triboelectric generator.
6. In paragraph 1, The first friction layer comprises Silk Fibroin-Phytic Acid-Glycerol (SF-PA-G). Moisture and triboelectric generator.
7. In paragraph 1, The second friction layer comprises Perfluoroalkoxy (PFA), Moisture and triboelectric generator.
8. A stacked structure forming step comprising: forming a moisture power generation layer that generates power from moisture on a first electrode; forming a second electrode on the moisture power generation layer; forming a first friction layer having at least one hollow formed on the second electrode; forming a second friction layer on the first friction layer; and forming a third electrode on the second friction layer. Method for manufacturing moisture and triboelectric generators.
9. In paragraph 8, After the above-mentioned laminated structure formation step, the method further includes a side closing step of closing the side of the laminated structure with a sealing portion. Method for manufacturing moisture and triboelectric generators.
10. In Paragraph 10, The above side closing step closes the side of the laminated structure using tape as a sealing part, and A wiring step further comprising electrically connecting the first electrode, the second electrode, and the third electrode to the outside through a conductive line passing through the sealing portion; Method for manufacturing moisture and triboelectric generators.
11. In paragraph 8, The first electrode, the second electrode, and the third electrode are prepared by including indium tin compound (ITO) or aluminum. Method for manufacturing moisture and triboelectric generators.
12. In paragraph 8, The above moisture generation layer or the above first friction layer is prepared by comprising Silk Fibroin-Phytic Acid-Glycerol (SF-PA-G). Method for manufacturing moisture and triboelectric generators.
13. In Paragraph 12, The above SF-PA-G is manufactured through the steps of: purifying and drying silk fibroin using an alkaline solution; preparing a mixed solution comprising the purified and dried silk fibroin, phytic acid, and glycerol; and forming the mixed solution into a desired film shape. Method for manufacturing moisture and triboelectric generators.
14. In paragraph 8, The second friction layer is prepared by including perfluoroalkoxy (PFA). Method for manufacturing moisture and triboelectric generators.
15. It includes two or more moisture and triboelectric generators according to paragraph 1, and The above moisture and triboelectric generators each function as artificial synapse devices, Artificial synapse device.

Description

A silk-based moisture-electric tribo-electric generator capable of dual-mode self-powered tactile sensing The present invention relates to a silk-based moisture-electric triboelectric generator capable of dual-mode self-powered tactile sensing. Specifically, the present invention relates to a moisture and triboelectric generator and a method for manufacturing the same. Electronic skin, or e-skin, is a device that detects and reconstructs tactile perception for various applications, such as surface texture recognition, tactile feedback gloves, and artificial neuromorphic loop systems. Mechanoreceptors found in human skin facilitate tactile perception through various mechanical deformations. To accurately mimic the functions of actual human skin, e-skin must possess both fast-adapting (FA) and slow-adapting (SA) mechanoreceptors to detect static pressure and high-frequency dynamic vibrations. Generally, dual-mode e-skin or artificial mechanoreceptors include FA-mimicking sensors based on triboelectric/piezoelectric materials or microphones, and SA-mimicking sensors based on piezoresistive/piezocapacitive materials. Furthermore, as the functionality and integration of tactile e-skin increase, issues regarding electronic waste, toxicity to human health, excessive power consumption, cost, and environmental risks have come to the forefront. Many self-powered or energy-generating e-skins have been reported, with triboelectric nanogenerator (TENG)-based e-skins receiving particular attention. These self-powered e-skins generally offer the advantages of simple fabrication, diverse material sources, and low cost. Typically, TENGs generate instantaneous electrical signals in response to external dynamic mechanical stimulation, outputting high voltage (over 10 V) and low current density (Jsc, 10 μA/cm²). However, in humid environments, a thin water film forms on the anode and cathode friction layers, and the number of charge carriers generated by the interaction of water's H + and OH- ions with the anode and cathode layers decreases. As relative humidity (RH) increases, the peak output voltage and current of the TENG decrease significantly, exhibiting very low power density at high humidity. Furthermore, TENG-based e-skins cannot reliably detect low-frequency static pressure (below 0.2 Hz) without being combined with external functional components. Wet Electrogenation (MEG) has been proposed as a technology for generating direct current (DC) energy. Electrical energy is generated by an ion gradient formed by the unbalanced emission of ions when moisture is continuously adsorbed onto the surface of an active material. Unlike TENGs, MEGs have an output (Voc) of less than 1 V and a Jsc of greater than 10 μA/ cm² . As humidity increases, the ion gradient increases, accelerating ion migration speeds, thereby further increasing the output power of MEGs. MEGs based on deformable hydrogels or aerogels can be developed as static pressure sensors because material deformation caused by external static pressure induces changes corresponding to voltage or current output. From the perspective of energy harvesting, the combination of TENGs and MEGs can simultaneously achieve high voltage and high current outputs over a wide RH range while maintaining balanced power density. From the perspective of sensing, the combination of TENGs and MEGs enables static/dynamic dual-mode sensing, providing comprehensive tactile sensing within a single device. Silk fibroin (SF) is a naturally derived polymer with excellent biocompatibility and biodegradability that can be processed into thin films or hydrogels with tunable mechanical properties. Although SF-based TENG or MEG devices have been widely reported, SF is difficult to ionize mobile H + ions upon water absorption due to the complex functional groups and hierarchical structure of its molecular chains, which allow it to self-assemble easily. Consequently, reported SF-based MEGs typically have a Voc of less than 0.3 V and a Jsc of less than 200 nA/ cm² . This limited performance has restricted the application of silk materials in the MEG field. Compared to SF-MEGs, SF-TENGs demonstrate better output performance, with a Voc reaching up to 50 V and a Jsc reaching approximately 1.5 μA/ cm² . Similar to other conventional TENGs, SF-based TENGs are susceptible to humidity, and power density decreases significantly at high humidity levels. This paper reports a biodegradable energy-generating skin (EG-skin) based on an SF-based membrane. The objective of the present invention is to produce a tactile skin equipped with autonomous energy generation capabilities, complete tactile perception (mimicking FA and SA), and biodegradability (Fig. 1A). The components of the EG-skin are SF-based films that generate a direct current (DC) output as the active layer of MEG and an alternating current (AC) output as the friction layer of TENG. MEG mimics SA mechanoreceptors with a sensitivity of 0.16 μA/kPa in respons