Abstract
Metal-organic frameworks (MOFs) nanosheets have attracted great attention in recent years due to their unprecedented properties. However, the synthesis of MOF nanosheets with controllable thickness still remains a challenge. In this work, a series of MOF nanosheets, such as CuBDC (BDC = 1,4-benzenedicarboxylate), CoNDC (NDC = naphthalene‐2,6‐dicarboxylate), CoBPDC (BPDC = biphenyl-4,4’-dicarboxylate), NiBDC and ZnTCPP (TCPP = tetrakis(4-carboxyphenyl)porphyrin) were successfully synthesized by using a metal hydroxide precursor approach. Importantly, the thicknesses of the obtained MOF nanosheets can be well regulated by controlling the conversion rate of the metal hydroxides. As a proof-of-concept application, the obtained CuBDC nanosheets were used as the catalyst for olefin epoxidation, which showed much higher catalytic activity compared to the bulk crystals. This work provides an alternative method for the synthesis of various MOF nanosheets, holding great potential for various promising applications.
Highlights
IntroductionMetal organic-frameworks (MOFs), as a class of porous materials, have attracted great attentions in the past decades due to their noticeable features, such as diversified structures, high surface areas and tunable functionalities, which endow them with favorable applications in separation (Li et al, 2009), sensing (Kreno et al, 2012), catalysis (Chughtai et al, 2015; Zhao M. et al, 2016; Yang et al, 2017; Zhu et al, 2017), gas storage (Chaemchuen et al, 2013; He et al, 2014) and so on
The pre-synthesized Cu(OH)2 nanosheets (Supplementary Figure 1) and H2BDC were added into a mixed solution of DMF and DI water (VDMF:Vw = 3.5:0.5)
The as-obtained CuBDC nanosheets were characterized by transmission electron microscopy (TEM) and scanning electron microscopy (SEM)
Summary
Metal organic-frameworks (MOFs), as a class of porous materials, have attracted great attentions in the past decades due to their noticeable features, such as diversified structures, high surface areas and tunable functionalities, which endow them with favorable applications in separation (Li et al, 2009), sensing (Kreno et al, 2012), catalysis (Chughtai et al, 2015; Zhao M. et al, 2016; Yang et al, 2017; Zhu et al, 2017), gas storage (Chaemchuen et al, 2013; He et al, 2014) and so on. Metal-Organic Frameworks Nanosheets activity toward the reduction of H2O2, surpassing that of natural heme protein-constructed sensors (Wang et al, 2016). These unique properties have tremendously stimulated research on the devising of innovative synthesis routes toward 2D nanostructured MOF materials (Wang et al, 2019a; Zhuang et al, 2019)
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