Two‐Dimensional Metal–Organic Framework Nanosheets

Abstract

Two‐dimensional (2D) metal–organic framework (MOF) nanosheets are attracting increasing research interest due to their unique properties originating from their ultrathin thickness and large surface area with highly accessible active sites. Here, the aim is to provide recent advances in the synthesis of 2D MOF nanosheets by using the top‐down and bottom‐up methods, including sonication exfoliation, interfacial synthesis, three‐layer synthesis, and surfactant‐assisted synthesis methods. In addition, the recent progress in 2D‐MOF‐nanosheet‐based nanocomposites is also introduced. The synthesis of 2D MOF nanosheets should lead to new kinds of functional nanomaterials for a wide range of applications.

2D Nanosheets and Their Composite Membranes for Water, Gas, and Ion Separation

“…[27] Peng et al applied am echanical exfoliation method to layered Zn 2 (bim) 3 and Zn 2 (bim) 4 precursors (bim = benzimidazole) by ball milling. [27] Peng et al applied am echanical exfoliation method to layered Zn 2 (bim) 3 and Zn 2 (bim) 4 precursors (bim = benzimidazole) by ball milling.…”

Structural Engineering of Low‐Dimensional Metal–Organic Frameworks: Synthesis, Properties, and Applications

“…[38][39][40] As another typical LD materials, 2D nanomaterials, such as 2D nanosheets of layered double hydroxides (LDHs), transition metal dichalcogenides (TMDs), hexagonal boron nitride, and MXenes, have attracted widespread attention since the discovery of graphene. [54][55][56] Additionally, various LD MOF-based composites and their derived hybrid nanomaterials with multifunctions have also been successfully prepared in recent years. [48][49][50] These types of MOFs, such as 1D single-walled MOF nanotubes, 1D hexagonal MOF nanorods, ultrathin 2D MOF nanosheets, [51][52][53] have similar morphological features to those of the other 1D or 2D nanomaterials, which endows them with distinctive dimensional-dependent properties including high aspect ratio and abundant accessible active sites.…”

“…[48][49][50] These types of MOFs, such as 1D single-walled MOF nanotubes, 1D hexagonal MOF nanorods, ultrathin 2D MOF nanosheets, [51][52][53] have similar morphological features to those of the other 1D or 2D nanomaterials, which endows them with distinctive dimensional-dependent properties including high aspect ratio and abundant accessible active sites. [60][61][62][63][64][65][66][67][68][69][70][71][72][73][74][75] Although the advantages and challenges of 1D metal-organic nanotubes [76] and 2D MOF nanosheets [48,50,56] have been well summarized by several previous review articles, the research field of LD MOFs is currently at a stage of rapid development, as indicated by annually increased amount of publications (Figure 2). To achieve effective and controllable preparation of LD MOFs, a large number of synthetic methods have been developed, such as template method, ultrasonic exfoliation, surfactant-assisted growth, three-layer method, etc.…”

A Surfactant‐Free and Scalable General Strategy for Synthesizing Ultrathin Two‐Dimensional Metal–Organic Framework Nanosheets for the Oxygen Evolution Reaction

“…[2] Their coordinatively unsaturated metal sites,which are exposed atomically dispersed metal ions,can be applied as highly active catalytic sites in catalysis, separation, and sensing. [6] These advantages can improve the performance of MOFs in supercapacitors, [1b] oxygen evolution reaction (OER), [7] oxygen reduction reaction (ORR), [8] hydrogen evolution reaction (HER) [9] and electrochemical CO 2 reduction (ECR). [6] These advantages can improve the performance of MOFs in supercapacitors, [1b] oxygen evolution reaction (OER), [7] oxygen reduction reaction (ORR), [8] hydrogen evolution reaction (HER) [9] and electrochemical CO 2 reduction (ECR).…”

“…[6] These advantages can improve the performance of MOFs in supercapacitors, [1b] oxygen evolution reaction (OER), [7] oxygen reduction reaction (ORR), [8] hydrogen evolution reaction (HER) [9] and electrochemical CO 2 reduction (ECR). [6] To date,s everal synthetic methods have been utilized to obtain the 2D MOF nanosheets.U ltrasonication-assisted exfoliation is regarded as af easible top-down method to delaminate some bulky MOFs,s uch as Zn 2 (bim) 4 (bim = benzimidazole) [11] and [Cu 2 Br(IN) 2 ]n (IN = isonicotinato), [12] into nanosheets through breaking the van der Waals force or hydrogen bonding. [6] To date,s everal synthetic methods have been utilized to obtain the 2D MOF nanosheets.U ltrasonication-assisted exfoliation is regarded as af easible top-down method to delaminate some bulky MOFs,s uch as Zn 2 (bim) 4 (bim = benzimidazole) [11] and [Cu 2 Br(IN) 2 ]n (IN = isonicotinato), [12] into nanosheets through breaking the van der Waals force or hydrogen bonding.…”