Synthesis of fluorometric carbon nano dots(CNDs) for selective sensing of biologically important Fe³⁺ and Cu²⁺ metal ions and evaluating their antioxidant capacity

In this research, CNDs were prepared by a green and cost effective method using Cinnamomum Tamala (bay leaf) as carbon sources. TEM, UV, FTIR, ZETA Potential, PL and Fluorescence methods were used to characterize the produced CNDs and the average particle size is 3.42 nm. This research was conducted on the development of fluorescent sensors for various metal ions, including Fe³⁺, Cu²⁺, Zn²⁺, Ni²⁺, Pb²⁺, Cr³⁺, Mg²⁺, Na^+ 1 and Cd²⁺. The CNDs demonstrated selective sensing of biologically important Fe^+ 3 and Cu^+ 2 metal ions. The CNDs antioxidant assay was tasked with DPPH• radical scavenging properties. CNDs made from Cinnamomum Tamala had the highest DPPH free radical scavenging activity at 100 mg/L (42.06%) with the IC₅₀ of 130.68 mg/L. The outcome implies that Indian spices are among the best materials for optical metal ion detection and sensing, and they also have therapeutic benefits.