Haraguchi Yuri, Imai Hiroaki, Oaki Yuya
Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan.
iScience. 2022 Aug 24;25(9):104933. doi: 10.1016/j.isci.2022.104933. eCollection 2022 Sep 16.
Exfoliation of layered materials, a typical route to obtain 2D materials, is not easily controlled because of the unpredictable downsizing processes. In particular, the thickness control remains as a complex challenge. Here, we found a correlation between the thickness and lateral size distribution of the exfoliated nanosheets, such as transition metal oxides and graphene oxide. The layered composites of the host metal oxides and interlayer organic guests are delaminated into the surface-modified nanosheets in organic dispersion media. The exfoliation behavior varies by combination of the hosts, guests, and dispersion media. Here, we found that the thick and thin nanosheets were obtained on the monodispersed and polydispersed conditions, respectively. The selective syntheses of the thick and thin nanosheets were achieved using a prediction model of the lateral size distribution. The correlation between the thickness and lateral size distribution can be applied to thickness-selective syntheses of 2D materials.
层状材料的剥离是获得二维材料的典型途径，但由于尺寸减小过程不可预测，因此不易控制。特别是，厚度控制仍然是一个复杂的挑战。在这里，我们发现了剥离的纳米片（如过渡金属氧化物和氧化石墨烯）的厚度与横向尺寸分布之间的相关性。主体金属氧化物和层间有机客体的层状复合材料在有机分散介质中分层为表面改性的纳米片。剥离行为因主体、客体和分散介质的组合而异。在这里，我们发现分别在单分散和多分散条件下获得了厚纳米片和薄纳米片。利用横向尺寸分布的预测模型实现了厚纳米片和薄纳米片的选择性合成。厚度与横向尺寸分布之间的相关性可应用于二维材料的厚度选择性合成。
