![]() ![]() ![]() It was found that the dopamine-modified cotton increased the strength of MOF-5 crystals attached to fibers. To determine how firmly crystals were attached to the cotton fibers, the substrates were exposed to a constant and strong air flow. The crystalline structure of MOF-5 was confirmed using X-ray diffraction. The effects of dopamine modification on the crystal growth and the formation of “necklace” morphology were investigated using scanning electron microscopy analysis. Unlike paper, the cotton bulb had a looser structure and MOF-5 crystals grew around the fibers, forming a stable “necklace” morphology. In the case of paper, which had a structure with fibers closely packed to each other, MOF-5 crystals grew only on the surface of fibers (one side) and could easily fall off. Besides dopamine, the structure of the substrate also played a major role in the crystal growth. The formed polydopamine film promoted the growth of MOF-5 crystals, which were bonded to the substrates. Dopamine was used as a surface modification agent to improve the compatibility between MOF-5 crystals and the used substrates. Herein, metal–organic framework (MOF)-5 crystals were grown on cellulose-based substrates including paper and cotton. ![]()
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