Materials Science and Engineering Program, University of Texas at Austin, Austin, TX, 78712, USA.
Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD, 21218, USA.
Adv Mater. 2022 Jul;34(30):e2203082. doi: 10.1002/adma.202203082. Epub 2022 Jun 23.
2D transition-metal-dichalcogenide materials, such as molybdenum disulfide (MoS ) have received immense interest owing to their remarkable structure-endowed electronic, catalytic, and mechanical properties for applications in optoelectronics, energy storage, and wearable devices. However, 2D materials have been rarely explored in the field of micro/nanomachines, motors, and robots. Here, MoS with anatase TiO is successfully integrated into an original one-side-open hollow micromachine, which demonstrates increased light absorption of TiO -based micromachines to the visible region and the first observed motion acceleration in response to ionic media. Both experimentation and theoretical analysis suggest the unique type-II bandgap alignment of MoS /TiO heterojunction that accounts for the observed unique locomotion owing to a competing propulsion mechanism. Furthermore, by leveraging the chemical properties of MoS /TiO , the micromachines achieve sunlight-powered water disinfection with 99.999% Escherichia coli lysed in an hour. This research suggests abundant opportunities offered by 2D materials in the creation of a new class of micro/nanomachines and robots.
二维过渡金属二卤族化合物材料，如二硫化钼（MoS ），由于其在光电、储能和可穿戴设备等领域具有显著的结构赋予的电子、催化和机械性能而受到极大关注。然而，二维材料在微/纳米机器、电机和机器人领域的应用却很少被探索。在这里，MoS 与锐钛矿 TiO 成功集成到原始的单侧开口空心微机器中，这使得 TiO 基微机器对可见光区域的光吸收增加，并首次观察到对离子介质的运动加速。实验和理论分析都表明，MoS /TiO 异质结具有独特的 II 型能带排列，这解释了由于竞争推进机制而观察到的独特运动。此外，通过利用 MoS /TiO 的化学性质，微机器实现了阳光驱动的水消毒，在一小时内使 99.999%的大肠杆菌裂解。这项研究表明，二维材料为创造一类新的微/纳米机器和机器人提供了丰富的机会。
