Amorphous-to-Crystalline Transformation with Fluorescence Enhancement and Switching of Molecular Nanoparticles Fixed in a Polymer Thin Film


  • Financial support from the Department of Science and Technology, New Delhi and infrastructure support from the Centre for Nanotechnology and the National Single Crystal X-ray Diffractometer Facility (School of Chemistry) at the University of Hyderabad are gratefully acknowledged. C.G.C. thanks the CSIR, New Delhi for a senior research fellowship. We thank M. Durgaprasad, M. Laxminaryana, and M. Nalini for the transmission electron microscopy, field emission scanning electron microscopy, and confocal fluorescence microscopy, respectively.


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Growth in a confined environment: A protocol for the amorphous-to-crystalline transformation (ACT) of nanoparticles has been developed, the critical step being the partial confinement of the particles by fixing in a polymer thin film and solvent vapor fuming. The ACT of a diaminodicyanoquinodimethane-based nanoparticle is accompanied by substantial fluorescence enhancement and switching of the emission color.