Controllable Preparation of Two Dimensional Metal- or Covalent Organic Frameworks for Chemical Sensing and Biosensing

In recent years, with the continuously deep and expanded researches of two-dimensional (2D) nanomaterials represented by graphene, 2D framework materials represented by 2D metal-organic frameworks (MOFs) and covalent organic frameworks (COFs) have attracted great research interests and extensive attention. Compared with other mesoporous or microporous nanomaterials, these organic framework materials provide uniformly nano-sized pores. And as compared to graphene, 2D organic framework materials can be expected to design and assemble the functionalized building units. For example, carboxyl group, amino group, hydroxyl group, etc. can be grafted onto the frameworks through various chemical reactions. These advantages are hopeful to make 2D organic framework materials a new generation of functional materials to improve the sensitivity and stability of the sensing interfaces. This review simply summarized 2D MOFs and COFs respectively, and generalized the current methods for preparing 2D MOFs and COFs nanomaterials based on "bottom-up" and "top-down" strategies and made simple comments. In addition, the applications of (2D) MOFs and COFs materials in chemical sensing and biosensing fields were introduced, and the potential and key problems of 2D MOFs and COFs in sensing applications were also discussed. And at last, this review gives some outlook for the future applications of 2D MOFs and COFs nanomaterials.