Speaker
Description
Abstract
The aim of the current work is to develop a nitrogen doped fluorescent carbon dots from methanolic extract of Buchnania lanzan leaf and urea via a simple one pot microwave method. Methanolic extract of Buchnania lanzan leaf was obtained via cold maceration, which served as the precursor of carbon dots while urea was used as a nitrogen doping agent. The mixture was heated in a microwave oven for a definite time, reconstituted with Milli-Q water and centrifuged to remove extraneous particles. The obtained brown colored supernatant was filtered and freeze dried to get CDs powder. The synthesized CDs was characterized using several techniques including UV-Visible spectroscopy, Fluorescence spectroscopy, Fourier transform infrared (FTIR), Zeta potential and Field emission scanning electron microscopy (FESEM). The as prepared CDs solution exhibited blue colored fluorescence under UV light of 365 nm. The UV-visible absorption spectrum of CDs exhibited characteristic shoulder peak at about 279 nm. In fluorescence spectra, excitation dependent emission behavior of CDs was obtained. FTIR spectra of CDs suggested presence of carboxyl and amino functional groups. In FESEM, size of CDs was found below 20 nm. Here in this work, the blue fluorescence emitting CDs with carboxyl and amnio functional group synthesized from a renewable and abundant source can serve as a useful and low-cost synthesis method of CDs. The small size, surface functional groups and fluorescence property of CDs can be utilized in the development of different drug delivery, bioimaging and disease detection devices.
Keywords: fluorescent carbon dots, microwave method, Buchnania lanzan