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Fluorescence Study of Ionic Intercalation/De-Intercalation in the Reaction-Diffusion Mediated Polymorphic Transition of a Class of Nanolayered Material

The mechanism of the intercalation/de-intercalation processes during the formation of α-Co (OH)2 and its conversion to β-Co (OH)2 is carefuly examined using a new non-invasive technique in a gel matrix. The incorporation of rhodamine molecules inside the interlayer gallery of α samples allows us to monitor the variation of its fluorescence intensity throughout different stages of the reactions. We show after calculating the corresponding activation energies that the formation/transformation reactions exhibit different dynamics depending on the nature of intercalated anions. Moreover, the morphological changes that are revealed from scanning electron micrographs suggest the occurence of an Ostawald ripening mechanism in which perfect and stable crystals are produced at the expense of smaller ones.