Wide-area multilayered self-assembly of fluorapatite nanorods vertically oriented on a substrate as a non-classical crystal growth
Wide-area multilayered self-assembly of fluorapatite nanorods vertically oriented on a substrate as a non-classical crystal growth
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DOI：
10.1039/d1nr01884a
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发表时间：
2021-05-18
期刊：
影响因子：
6.7
通讯作者：
Imai, Hiroaki
中科院分区：
文献类型：
--
作者：
Hagiwara, Yuki;Oaki, Yuya;Imai, Hiroaki
均匀形状的纳米块（例如纳米立方体和纳米棒）的定向附着作为非经典晶体生长的基本过程以产生功能材料的特定有序结构而引起关注。虽然水平取向的纳米棒的横向排列通常在分散体系中的空气-液体和液体-固体界面处观察到，但是在基底上的垂直取向的纳米棒的积累很少在毫米大小的平坦表面上的宽区域中产生。在这里，我们实现了均匀堆叠的垂直氟磷灰石纳米棒与大的纵横比（类似于6）在甲苯-己烷混合物系统中通过逐渐减少的折射率。微米厚的平面膜，其中氟磷灰石纳米棒的c方向垂直于表面排列，沉积在直径超过20 mm的基底上。垂直纳米棒的大面积积累发生通过横向排列的纳米棒簇覆盖的稳定剂和随后的温和的沉积在基底表面上的自组装。
Oriented attachment of homogeneously shaped nanoblocks, such as nanocubes and nanorods, is attracting attention as a fundamental process of non-classical crystal growth to produce specific ordered architectures of functional materials. Although lateral alignments of horizontally oriented nanorod are commonly observed at the air-liquid and liquid-solid interfaces in dispersion systems, the accumulation of vertically oriented nanorods on a substrate has rarely been produced in a wide area over a millimeter-sized flat surface. Here, we achieved homogeneous stacking of vertical fluorapatite nanorods with a large aspect ratio (similar to 6) in a toluene-hexane mixture system through a gradual decrease in the dispersibility. Micrometer-thick flat films in which the c direction of fluorapatite nanorods was arranged perpendicularly to the surface were deposited on a substrate with a diameter of over 20 mm. The wide-area accumulation of vertical nanorods occurs through the self-assembly of laterally arranged clusters of nanorods covered with a stabilizing agent and subsequent gentle sedimentation on the substrate surface.