Title
Photoluminescence Dynamics of Copper Nanoclusters Synthesized by Cellulase: Role of Random-Coil Structure
Author
Akanksha Singh, Tripti Raia, Debashis Panda
Year
2016
Journal
RSC Advances
Abstract
This study demonstrates the one-pot cellulase-directed synthesis of magic numbered copper nanoclusters (Cu NCs) with blue-, cyan-, and green-luminescent emission from Cu12, Cu20, and Cu34, respectively. The developed Cu NCs have excellent luminescence quantum yield, photostability and water solubility. The temperature-dependent response of the blue luminescent nanolcuster gets flipped over by changing the aqueous medium to methanolic one. Moreover, the preferential stabilization of large-sized Cu34 NCs-Cellulase over relatively smaller one, Cu20 NCs-Cellulase is found to be dependent on both temperature as well as solvent. The luminescence of Cu20 NCs-Cellulase can be greatly augmented by the addition of Zn (II) and Cd (II) ions, whereas the Fe (III) ions quench the luminescence. The random coil structure of enzyme dictates the size and luminescent properties of Cu NCs. This unique and beneficial aspect of Cu NCs warrants them to find possible application as a sensitive marker for cell imaging, and nanophotonic materials.
Instrument
J-815
Keywords
Circular dichroism, Secondary structure, Nanostructures, Materials, Biochemistry