Wang Chenhui, Sakai Nobuyuki, Ebina Yasuo, Kikuchi Takayuki, Grzybek Justyna, Roth Wieslaw J, Gil Barbara, Ma Renzhi, Sasaki Takayoshi
Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan.
Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, Kraków, 30-387, Poland.
Small. 2024 Jul;20(27):e2308293. doi: 10.1002/smll.202308293. Epub 2024 Jan 28.
Zeolites have been widely applied as versatile catalysts, sorbents, and ion exchangers with unique porous structures showing molecular sieving capability. In these years, it is reported that some layered zeolites can be delaminated into molecularly thin 2-dimensional (2D) nanosheets characterized by inherent porous structures and highly exposed active sites. In the present study, two types of zeolite nanosheets with distinct porous structures with MWW topology (denoted mww) and ferrierite-related structure (denoted bifer) are deposited on a substrate through the solution process via electrostatic self-assembly. Alternate deposition of zeolite nanosheets with polycation under optimized conditions allows the layer-by-layer growth of their multilayer films with a stacking distance of 2-3 nm. Furthermore, various hierarchical structures defined at the unit-cell dimensions can be constructed simply by conducting the deposition of mww and bifer nanosheets in a designed sequence. Adsorption of a dye, Rhodamine B, in these films, is examined to show that adsorption is dependent on constituent zeolite nanosheets and their assembled nanostructures. This work has provided fundamental advancements in the fabrication of artificial zeolite-related hierarchical structures, which may be extended to other zeolite nanosheets, broadening their functionalities, applications, and benefits.
沸石作为具有独特多孔结构且具有分子筛能力的多功能催化剂、吸附剂和离子交换剂已被广泛应用。近年来，据报道一些层状沸石可以剥离成分子级薄的二维（2D）纳米片，其特征在于具有固有的多孔结构和高度暴露的活性位点。在本研究中，通过静电自组装的溶液过程，将两种具有不同多孔结构且具有MWW拓扑结构（表示为mww）和镁碱沸石相关结构（表示为bifer）的沸石纳米片沉积在基板上。在优化条件下，沸石纳米片与聚阳离子交替沉积，可实现其多层膜的逐层生长，堆叠距离为2-3纳米。此外，只需通过按设计顺序进行mww和bifer纳米片的沉积，就可以构建在晶胞尺寸上定义的各种分级结构。对这些薄膜中罗丹明B染料的吸附进行了研究，结果表明吸附取决于组成沸石纳米片及其组装的纳米结构。这项工作在人造沸石相关分级结构的制造方面取得了基础性进展，这可能会扩展到其他沸石纳米片，拓宽它们的功能、应用和益处。
