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A transition between a micron-leaf-like structure (ZIF-L) at room temperature to the nano-zeolitic imidazolate framework-8 (n-ZIF-8) was produced by using a water-based synthesis without modulating agents. Polymorphisms of ZIF structures were produced in an hour by mixing varying molar ratios of 2-methylimidazole and zinc nitrate hexahydrate (8:1, 21:1, and 35:1). The polymorphic phase transition of the ZIFs was identified using powder X-ray diffraction (PXRD), transmission electron microscopy (TEM), thermal gravimetric analysis (TGA), and surface and pore characteristics from a nitrogen adsorption analyzer. The sizes of the particles range from micron to nano (ZIF-L = 2 µm, n 21 ZIF-8 = 400 nm, and n 35 ZIF-8 = 100 nm). The n 35 -ZIF-8 has amongst the highest surface area of any ZIF-8 currently reported, with approximately 1776 m 2 g −1  and is thermally stable up to 400 °C. Meanwhile, n 21 ZIF-8 demonstrated the greatest CO 2  absorption capacity by absorbing up to 22.71 mmolg −1  of CO 2  at 273 K.

Effect of altering linker ratio on nano-ZIF-8 polymorphisms in water-based and modulator-free synthesis