Green Synthesis of Honeycomb-Structured Carbon Quantum Dots from Cigarette Smoke

Abstract

Abstract This study presents a novel and environmentally friendly approach to synthesizing honeycomb carbon quantum dots (CQDs) from cigarette smoke by a hydrothermal process. A comprehensive characterization of these CQDs, conducted through high-resolution transmission electron microscopy (HRTEM), showcases their unique honeycomb structure, with an average particle size of 6.3 nm. Photoluminescence (PL) in CQDs is a captivating phenomenon where these nanoscale carbon structures emit strong blue luminescence at 461 nm upon exposure to ultraviolet light, with their excitation peak occurring at 380 nm. Additionally, Fourier Transform Infrared (FTIR) analysis identifies specific functional groups within the CQDs, offering valuable insights into the mechanisms governing their photoluminescence. Analysis of excitation spectra indicates the presence of both aromatic C = C bonds at 254 nm and C − O bonds from 280 nm to 420 nm, showcasing the potential of using cigarette smoke as a sustainable source for creating eco-friendly honeycomb-structured CQDs.