Wood powder-derived quantum dots for CeO2 photocatalytic and anti-counterfeit applications

Abstract

Carbon quantum dots (CQDs or CDs) are regarded as alternatives to heavy metal quantum dots and organic fluorescent dyes. CDs show photoluminescent (PL) properties that are comparable to quantum dots and organic fluorescent dyes, but are generally eco-friendlier, less toxic and water soluble. Herein we report a novel method to prepare CDs from industrially-derived wood powder residues, which contrasts to conventional CDs synthesis that utilizes chemical agents. A solution of these wood-derived CDs was found to emit bright blue light when exposed to ultraviolet light, with a quantum yield of 47.4%. This solution was also found to significantly improve the reaction speed and efficiency of the photocatalytic degradation of CeO2. In addition, wood-based CDs performed well as a solid state, non-aqueous fluorescent and stamp-pad ink, with potential anti-fraudulent applications.