Single-Layer 2D Ni?BDC MOF Obtained in Supercritical CO2-Assisted Aqueous Solution |
| |
| Authors: | Hongwei Chang Yannan Zhou Xiaoli Zheng Wei Liu Prof Qun Xu |
| |
| Institution: | 1. College of Materials Science and Engineering, Zhengzhou University, 100, Science Avenue, Zhengzhou, Henan Province, P. R. China;2. Henan Institute of Advanced Technology, Zhengzhou University, Zhengzhou, 450052 P. R. China |
| |
| Abstract: | The development of an efficient strategy for fabricating two-dimensional metal-organic framework (MOF) nanosheets with high yield and high stability is desirable. Herein, we demonstrate for the first time that large, single-layer 2D nickel-benzene dicarboxylate (Ni?BDC) MOF nanosheets can be fabricated with the assistance of supercritical (SC) CO2 in a pure aqueous system. Detailed experimental evidence reveals that the SC CO2 molecule can exchange with the lattice-coordinated H2O molecules, side-on coordinate with the metal Ni1 sites on the Ni?BDC surface, and finally break the interlayer hydrogen bond to exfoliate the bulk Ni?BDC into a 2D MOF. More importantly, a thin SC CO2 layer building up at the water?Ni?BDC interfaces can transform the pristine hydrophilic interface into a super-hydrophobic one. This super-hydrophobic layer at the water-MOF interface can effectively prevent dissociation, thus promoting the stability of Ni?BDC in aqueous system. |
| |
| Keywords: | benzene dicarboxylate metal-organic frameworks nickel supercritical CO2 super-hydrophobic layers water-MOF interfaces |
|
|
