摘要
作为新一代的多孔材料,金属-有机框架(MOFs)由于具有晶体结构多样性、比表面积高、热稳定性较好以及功能可调等优点而受到人们的广泛关注。如何制备高质量的MOFs薄膜并将其功能化应用是当前的研究热点。本综述将介绍一类通过液相外延生长法在功能化基底表面上层层组装MOFs薄膜(SURMOFs),并重点总结了SURMOFs的制备途径,包括层层浸渍法、层层泵式法、层层喷雾法、层层旋涂法以及层层流动法,从而为制备高质量SURMOFs提供了保障,将更有利于MOFs材料在传感器和器件等领域的应用。
As a new generation of porous materials, metal-organic frameworks(MOFs) have attracted great attention for various applications due to their interesting crystalline networks, large surface area, high thermal stability and tunable functionalities. Typically, MOFs in powder and bulk form are inconvenient for the applications in the fields of energy and environment, separation, catalysis, sensors and devices. In contrast, thin films or membranes of MOFs can be served as great potential candidates for promising applications due to their large surface area and rich active sites. Recently, a kind of MOF thin films grown on substrate surfaces were successfully prepared through a liquid-phase epitaxial(LPE) layer-by-layer method(called surface-mounted MOFs, SURMOFs). In this procedure, the substrate surfaces are modified with different functional groups for the first coordination with metal ions during the growth of MOFs. Afterwards, the metal salts and organic ligands solutions are sequentially immersed with functionalized substrates using such LPE layer-by-layer approach.Between each two immersing steps, the sample is rinsed with solvent to remove the uncoordinated precursors. Importantly,such approach can prepare homogenous MOFs thin films with single growth orientation, well-controlled thickness of SURMOFs by tuning the growth cycles. As compared with the powder of bulk MOFs, such MOFs thin films with homogenous surface, highly orientation and tunable thickness give rise to more competitive candidates for the study of physical/chemical properties and the applications of adsorption/separation, catalysis, sensors and devices. In this review, we will particularly introduce the LPE layer-by-layer growth of MOFs thin films on substrate surfaces and summarize the growth strategies of SURMOFs including LPE layer-by-layer dipping, pump, spray, spin-coating and flowing method. Such high quality MOFs thin films can serve as promising candidates for studying the crucial intrinsic properties of porous materials, and additionally,it will be of interest for the design of high quality MOFs thin films for practical applications in the fields of sensors and devices.
作者
谷志刚
GU Zhigang(State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences, Fuzhou 350002, China)
出处
《功能高分子学报》
CAS
CSCD
北大核心
2019年第5期533-540,共8页
Journal of Functional Polymers
基金
中国科学院青年创新促进会(2018339)
国家自然科学基金(21872148,21601189)
福建省自然科学基金(2016J01085)
关键词
金属-有机框架
薄膜
液相外延
层层组装
metal-organic frameworks
thin film
liquid-phase epitaxy
layer-by-layer growth