(067007)Green Synthesis of Blue Light-Emitting Carbon Dots Using Tridax procumbens Leaves: Optical and Electrochemical Studies

摘要

We report the preparation of biocompatible blue emitting carbon dots (CDs) using Tridax procumbens (T. procumbens) leaf extractas a bio-source. A one-step hydrothermal method was employed to prepare highly effective photoluminescent CDs. As-synthesizedCDs were characterized using Ultraviolet-visible spectroscopy (UV-visible), Photoluminescence (PL), Fourier transform infrared(FT-IR), transmission electron microscopy (TEM) and Confocal Raman spectroscopy techniques. In addition, the third-orderoptical nonlinearity of the prepared CDs was carried out using Z-scan technique with the help of continuous wave diode pumpedNd:YAG laser (532 nm). The nonlinear optical (NLO) susceptibility, nonlinear absorption coef?cient and nonlinear refractiveindex were calculated. The synthesized CDs exhibited good excitation dependent properties. The CDs/Na?on modi?ed glassycarbon electrode (CDs/Nf/GCE) was prepared and its electrochemical and catalytic properties were evaluated by using cyclicvoltammetry (CV). The CDs/Nf/GCE exhibited high electrocatalytic activity for dopamine oxidation in physiological condition.This new CDs/Nf/GCE showed a linear range of Dopamine (DA) detection from 40 to 220 μM with the limit of detection (LOD) of2.7 μM. The stability and reproducibility of the electrode were also investigated which indicated that this green synthesized CDscould be used for the development of electrochemical sensor to determine DA concentration in biological samples.10.1149/2162-8777/acdf81