Graphene Inks as Versatile Templates for Printing Tiled Metal Oxide Crystalline Films
Graphene Inks as Versatile Templates for Printing Tiled Metal Oxide Crystalline Films
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DOI：
10.1002/adma.201705080
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发表时间：
2018-01-25
影响因子：
29.4
通讯作者：
Hurt, Robert H.
中科院分区：
文献类型：
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作者：
Liu, Muchun;Chen, Po-Yen;Hurt, Robert H.
人们对利用层状材料中的货车德瓦耳斯间隙作为约束反应容器来模板合成新的纳米片结构非常感兴趣。例如，多层氧化石墨烯中的廊道空间可以插入在牺牲石墨烯模板的热氧化期间组装成金属氧化物膜的水合金属离子。然而，这种方法提供了有限的结构控制，并且通常不会导致各向异性片状晶体的2D原子级生长，而是定向烧结成多孔片的简单颗粒阵列。在这里，一个新的石墨烯导向的组装路线证明，产生完全致密的，空间填充膜的平铺金属氧化物片晶与镶嵌结构。该方法依赖于胶体工程来生产可印刷的“金属化石墨烯墨水”，可以精确控制金属负载、粒度/孔隙率、组成和微米/纳米形态，并且能够实现比插层方法更高的金属-碳比。这些平铺结构足够坚固，可以创建独立的纸张，复杂的显微纹理薄膜，3D形状和天然生物纹理的金属氧化物复制品。
There is great interest in exploiting van der Waals gaps in layered materials as confinement reaction vessels to template the synthesis of new nanosheet structures. The gallery spaces in multilayer graphene oxide, for example, can intercalate hydrated metal ions that assemble into metal oxide films during thermal oxidation of the sacrificial graphene template. This approach offers limited control of structure, however, and does not typically lead to 2D atomic-scale growth of anisotropic platelet crystals, but rather arrays of simple particles directionally sintered into porous sheets. Here, a new graphene-directed assembly route is demonstrated that yields fully dense, space-filling films of tiled metal oxide platelet crystals with tessellated structures. The method relies on colloidal engineering to produce a printable "metallized graphene ink" with accurate control of metal loading, grain size/porosity, composition, and micro/nanomorphologies, and is capable of achieving higher metal-carbon ratio than is possible by intercalation methods. These tiled structures are sufficiently robust to create free standing papers, complex microtextured films, 3D shapes, and metal oxide replicas of natural biotextures.