Yano Hitomi, Sakai Nobuyuki, Ebina Yasuo, Ma Renzhi, Osada Minoru, Fujimoto Kenjiro, Sasaki Takayoshi
Department of Pure and Applied Chemistry, Faculty of Science and Chemistry, Tokyo University of Science, Yamazaki 2641, Noda, Chiba 278-8510, Japan.
International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan.
ACS Appl Mater Interfaces. 2021 Sep 15;13(36):43258-43265. doi: 10.1021/acsami.1c11463. Epub 2021 Aug 30.
This study reports a design of a variety of nanostructured films of 2D oxide nanosheets. We systematically examined the deposition of perovskite-type CaNbO nanosheets by spin-coating their dimethyl sulfoxide dispersion. Neat and homogeneous monolayer tiling was attained on various substrates by selecting an optimum rotation speed, which was dependent on the nanosheet concentration. Repeating the optimized spin-coating process allowed for layer-by-layer deposition of the nanosheets into multilayer films with a designed layer number. Vertical superlattice heterostructures could also be assembled by alternately spin-coating the suspensions of CaNbO and TiO nanosheets. Furthermore, spin-coating of a mixed suspension of CaNbO and TiO nanosheets led to a mixed mosaic-like monolayer of these two nanosheets. The present study thus demonstrated spin-coating as a facile and powerful route to construct various nanostructures based on 2D oxide nanosheets.
本研究报告了一种二维氧化物纳米片的多种纳米结构薄膜的设计。我们通过旋涂钙钛矿型CaNbO纳米片的二甲基亚砜分散液，系统地研究了其沉积过程。通过选择取决于纳米片浓度的最佳转速，在各种基板上实现了整齐且均匀的单层平铺。重复优化的旋涂过程可将纳米片逐层沉积成具有设计层数的多层膜。通过交替旋涂CaNbO和TiO纳米片的悬浮液，还可以组装垂直超晶格异质结构。此外，旋涂CaNbO和TiO纳米片的混合悬浮液会形成这两种纳米片的混合马赛克状单层。因此，本研究证明了旋涂是一种基于二维氧化物纳米片构建各种纳米结构的简便而有效的途径。
