Surface nano-architecture of a metal-organic framework
Surface nano-architecture of a metal-organic framework
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DOI：
10.1038/nmat2769
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发表时间：
2010-07-01
期刊：
影响因子：
41.2
通讯作者：
Kitagawa, Hiroshi
中科院分区：
文献类型：
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作者：
Makiura, Rie;Motoyama, Soichiro;Kitagawa, Hiroshi
金属有机骨架(MOF)-高度有序的微孔材料(1-5)-的超薄膜的合理组装具有良好的生长方向和膜厚，是使MOF能够在纳米技术设备中使用的关键和尚未实现的问题，例如燃料电池的传感器、催化剂和电极。在这里，我们报道了在由金属卟啉组成的固体表面(NaFS-1)上，在室温下由下而上容易地制备出这样一种完美的择优取向的MOF纳米薄膜。NaFS-1的构建是通过逐层生长技术与Langmuir-Blodgett方法相结合的模块方式的非常规集成实现的。同步辐射X射线表面结晶学研究表明，NaFS-1分子筛在面外和面内取向上都具有较高的结晶有序性。拟议的结构模型包含了从二维片上投射的金属配位的吡啶分子，这使得在NaFS-1的生长过程中，每一层都可以以高度有序的交指方式对接。我们预计，基于溶液的生长策略的多功能性将使各种有序的MOF纳米薄膜的制备成为可能，为它们在一系列重要应用中的使用开辟了道路。
The rational assembly of ultrathin films of metal-organic frameworks (MOFs)-highly ordered microporous materials(1-5) -with well-controlled growth direction and film thickness is a critical and as yet unrealized issue for enabling the use of MOFs in nanotechnological devices, such as sensors, catalysts and electrodes for fuel cells. Here we report the facile bottom-up fabrication at ambient temperature of such a perfect preferentially oriented MOF nanofilm on a solid surface (NAFS-1), consisting of metalloporphyrin building units. The construction of NAFS-1 was achieved by the unconventional integration in a modular fashion of a layer-bylayer growth technique coupled with the Langmuir-Blodgett method. NAFS-1 is endowed with highly crystalline order both in the out-of-plane and in-plane orientations to the substrate, as demonstrated by synchrotron X-ray surface crystallography. The proposed structural model incorporates metal-coordinated pyridine molecules projected from the two-dimensional sheets that allow each further layer to dock in a highly ordered interdigitated manner in the growth of NAFS-1. We expect that the versatility of the solution-based growth strategy presented here will allow the fabrication of various well-ordered MOF nanofilms, opening the way for their use in a range of important applications.