Shi Yue, Osada Minoru, Ebina Yasuo, Sasaki Takayoshi
Institute of Materials and Systems for Sustainability (IMaSS) and Department of Materials Chemistry, Nagoya University, Nagoya 464-8601, Japan.
International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0044, Japan.
ACS Nano. 2020 Nov 24;14(11):15216-15226. doi: 10.1021/acsnano.0c05434. Epub 2020 Oct 29.
Recent advances in two-dimensional (2D) materials offer an opportunity for atomic layer engineering of functional thin films and superlattices. For future applications of 2D materials, there is an urgent need to develop convenient deposition processes that enable precise control of thin-film architectures while reducing the time, cost, and energy/sample consumption. Here, we demonstrate a strategy for nanosheet assembly using a simple drop casting with a pipet and a hot plate. By controlled thermal convection of a single droplet on a hot plate, a range of 2D nanosheets, such as TiO, CaNbO, RuO, and graphene oxide, can be neatly tiled to form an ideal monolayer on various substrates in ∼30 s over a wide area (., a 50 mmϕ substrate). The mechanism and control strategies are discussed. We also demonstrate the production of various functional coatings such as conducting, semiconducting, insulating, magnetic, and photochromic coatings in multilayer, superlattice, and submicrometer-thick forms, offering the potential for a convenient way to produce high-quality 2D nanosheet films.
二维（2D）材料的最新进展为功能薄膜和超晶格的原子层工程提供了契机。对于二维材料的未来应用而言，迫切需要开发便捷的沉积工艺，以便在减少时间、成本以及能量/样品消耗的同时，能够精确控制薄膜结构。在此，我们展示了一种使用移液器和热板进行简单滴铸的纳米片组装策略。通过控制热板上单个液滴的热对流，一系列二维纳米片，如TiO、CaNbO、RuO和氧化石墨烯，能够在约30秒内整齐地平铺在各种大面积（如50 mmϕ的基板）的基板上，形成理想的单层。文中讨论了其机理和控制策略。我们还展示了多层、超晶格和亚微米厚形式的各种功能涂层的制备，如导电、半导体、绝缘、磁性和光致变色涂层，为便捷生产高质量二维纳米片薄膜提供了可能性。
