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MWCNT 표면 코팅을 통한 3D 프린팅 기반 자이로이드 구조의 압력 센서
김항겸(Hang-Gyeom Kim),김남중(Namjung Kim),김회준(Hoe Joon Kim) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
This paper reports the fabrication and characterization of a pressure sensor with multi-walled carbon nanotube (MWCNT) surface coated gyroid structure using fused filament fabrication (FFF) three-dimensional (3D) printing of foaming thermoplastic polyurethane (TPU). 3D printing technology offers a faster fabrication of complex structures with various materials. The gyroid structure is mechanically robust despite low density. And it can easily tune mechanical properties with changing packing density or cell density. In this work, we develop a pressure sensor with gyroid structure coated with MWCNT. Herein, the gyroid structure printed with foaming TPU filament swelled the polymer chains using the ethyl acetate solvent and then firmly coated with MWCNT to the surface to give electrical properties. We characterize mechanical, electrical properties of pressure sensor with various packing densities. And by calibrating the response of an applied force, we can quantify pressure. We believe the proposed sensor is suited for human motion monitoring systems.
Single electrode mode triboelectric nanogenerator (TENG) based on self-aligned microcilia structure
Jungyeun Seo,Sugato Hajra,Hoe Joon Kim(김회준) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
This study proposes a single electrode mode triboelectric nanogenerator (TENG) based on self-aligned microcilia structure. As the demand for sensors increases with the development of the internet of things (IoT), the importance of sustainable energy sources is emerging. Among various energy harvesting system, TENG has drawn much attention due to its unique properties such as high output efficiency and simple structure. We fabricated the microcilia structure to enhance the output performance using carbonyl iron (CI)/PDMS composite and magnet. The cilia structured TENG (CTENG) produced an open-circuit voltage of 70 V, current of 150 nA, and a power density of 2.75 μW/cm2 at 30 MΩ. CTENG can collect the electrical energy from the biomechanical motion such as finger tapping and wind blowing. Further, the ion injection on cilia structure doubled the voltage output. We expected that our device could be utilized for self-powered systems.