ウェアラブルデバイスが指の曲げ伸ばしで記憶と電源を作る(Wearable device makes memories and powers up with the flex of a finger)

2023-10-19 ロイヤルメルボルン工科大学(RMIT)

＜関連情報＞

• https://www.rmit.edu.au/news/all-news/2023/oct/wearable-device
• https://onlinelibrary.wiley.com/doi/10.1002/adfm.202307348

液体金属ビスマスから多機能原子状薄膜酸化物を開発 Multi-Functional Atomically Thin Oxides from Bismuth Liquid Metal

Xiangyang Guo, Chung Kim Nguyen, Nitu Syed, Anil Ravindran, Md Akibul Islam, Tobin Filleter, Kun Cao, Yichao Wang, Aishani Mazumder, Chenglong Xu, Sumeet Walia, Mohammad B. Ghasemian, Kourosh Kalantar-Zadeh, Sam C. Scholten, Islay O. Robertson, Alexander J. Healey, Jean-Philippe Tetienne, Teng Lu, Yun Liu, Aaron Elbourne, Torben Daeneke, Anthony Holland, Salvy P. Russo, Yongxiang Li, Ali Zavabeti
Advanced Functional Materials  Published: 19 September 2023
DOI:https://doi.org/10.1002/adfm.202307348

Abstract

Atomically thin, mechanically flexible, memory-functional, and power-generating crystals play a crucial role in the technological advancement of portable devices. However, the adoption of these crystals in such technologies is sometimes impeded by expensive and laborious synthesis methods, as well as the need for large-scale, mechanically stable, and air-stable materials. Here, an instant-in-air liquid metal printing process utilizing liquid bismuth (Bi) is presented, forming naturally occurring, air-stable, atomically thin, mechanically flexible nanogenerators and ferroelectric oxides. Despite the centrosymmetric nature of the monoclinic P21/c system of achieved α-Bi₂O_3-δ the high kinetics of liquid metal synthesis leads to the formation of vacancies that disrupt the symmetry which is confirmed by density functional theory (DFT) calculations. The polarization switching is measured and utilized for ferroelectric nanopatterning. The exceptional attributes of these atomically thin multifunctional stable oxides, including piezoelectricity, mechanical flexibility, and polarizability, present significant opportunities for developing nano-components that can be seamlessly integrated into a wide range of devices.