(a) SEM images of highly dispersed Si-ZSM-5@GO crystals; (b) SEM images of individual Si-ZSM-5@GO crystals; (c) TEM images of Si-ZSM-5@GO zeolite crystals and The in-situ electron diffraction pattern indicates that the crystal grows along the c-axis; (d) Argon adsorption and desorption curves and pore size distribution diagrams.
Graphene oxide (GO) is an important precursor for synthetic graphene materials. Its surface contains various functional groups such as hydroxyl, epoxy, carboxyl, etc., which provides favorable conditions for the preparation of graphene composites. However, the interaction between these polar functional groups and the crystal faces of inorganic materials limits the controlled growth of the crystallization of inorganic materials.
A team member of the Institute of Physical and Chemical Technology of the Chinese Academy of Sciences, Dr. Jianxin Jian, used the selective action between different crystal faces of GO and zeolite crystals to achieve controlled growth of inorganic materials in the graphene system, producing highly dispersed, multicrystalline surfaces containing Multi-well structure, Si-ZSM-5 zeolite crystals grown along the c-axis orientation. As shown in the figure, by adding GO in the solvent-free synthesis, the aggregation of Si-ZSM-5 zeolite crystals was suppressed, and highly-dispersed Si-ZSM-5 crystals were obtained; it was found that GO was added with solvent-free synthesis. As the amount increases, the Si-ZSM-5 crystals tend to grow along the c-axis orientation. In cooperation with Shi Guosheng, a researcher at the Shanghai Institute of Applied Physics, Chinese Academy of Sciences, the molecular dynamics simulation method was used to further elucidate the mechanism of GO-induced Si-ZSM-5 crystal growth along the c-axis. In addition, GO was added as a hard template of the mesoporous structure to the Si-ZSM-5 crystals to form Si-ZSM-5 zeolite crystals having a multi-order pore structure.
The adjustment of the dispersity and morphology of Si-ZSM-5 zeolite crystals by GO is of significance for the controllable synthesis of the crystal morphology of inorganic materials, and the basic research in the field of inorganic materials interface science and as a building block for optical, catalytic and Applied research in energy and other fields has great research value. The results were published on Angewandte Chemie International Edition titled Graphene Oxide Facilitates Solvent-Free Synthesis of Well-Dispersed, Faceted Zeolite Crystals.
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