마찰대전 기반의 에너지 하베스팅에서 다층박막적층법의 응용
Application of Layer-by-Layer Assembly in Triboelectric Energy Harvesting
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초록
마찰대전 나노발전기(triboelectric nanogenerator, TENG) 장치는 최근 몇 십여년 동안 많은 관심을 불러일으켰다. 주변에서 버려지는 에너지 중 기계적 에너지를 수확하는 기술 중 하나인 TENG 기술은 정전기 유도 및 마찰 대전의 이중 효과로 얻어진다. 특히, 나노 로봇이나 마이크로 전자기계 장치와 같은 초소형 전자 장치의 급속한 발전으로 초박막 장치에 대한 수요가 크게 증가했다. TENG 기술의 급속한 성장과 함께 높은 전기 출력 성능과 저렴한 제조 기술을 갖춘 적절한 마찰대전 재료를 선택하는 것은 지속 가능한 나노발전기 작동에 필수적이다. 최근 이러한 문제를 극복하기 위한 하나의 방법으로 다층박막적층법 (혹은 층상자기조립법, layer-by-layer (LbL) self-assembly technique)이 고려되고 있다. 이 LbL 자기조립 기술은 TENG의 성능 향상 및 응용 분야에서 두께 문제를 성공적으로 극복할 뿐만 아니라 저비용, 친환경 공정을 제시했으며 대규모 생산에 사용할 수 있다. 본 리뷰에서는 TENG 장치를 위한 LbL 기반의 소재 개발에 있어 최근의 연구들을 검토하였으며, 현재까지 검토된 에너지 수확 장치 분야에서의 잠재력을 살펴보았다. LbL 기술을 적용하여 제작한 TENG 장치의 이점에 대해 논의하고, 마지막으로 다양한 초박형 TENG 구현을 위한 본 제작 기술의 방향과 관점을 간략하게 제시하였다.
Abstract
Triboelectric nanogenerator (TENG) devices have generated a lot of interest in recent decades. TENG technology, which is one of the technologies for harvesting mechanical energy among the energy wasted in the environment, is obtained by the dual effect of electrostatic induction and triboelectric charging. Recently, a multilayer thin film stacking method (or layer-by-layer (LbL) self-assembly technique) is being considered as a method to improve the performance of TENG and apply it to new fields. This LbL assembly technology can not only improve the performance of TENG and successfully overcome the thickness problem in applications, but also present an inexpensive, environmentally friendly process and be used for large-scale and mass production. In this review, recent studies in the accomplishment of LbL-based materials for TENG devices are reviewed, and the potential for energy harvesting devices reviewed so far is checked. The advantages of the TENG device fabricated by applying the LbL technology are discussed, and finally, the direction and perspective of this fabrication technology for the implementation of various ultra-thin TENGs are briefly presented.
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