Preparation of high quantum yield nitrogen and sulfur co-doped carbon dots for sensitive detection of Cu2+

Nitrogen and sulfur co-doped green fluorescent carbon dots (G-CDs) with quantum yield (QY) of 28.26% were synthesized by hydrothermal method with p-phenylenediamine and thiosemicarbazone as precursors. The synthesized G-CDs exhibit good sensitivity and anti-interference ability for detecting copper ion (Cu2+) by fluorescence quenching (lambda(ex)=390 nm, lambda(em)=535 nm) with a linear range of 20 to 200 mu M and the limit of detection of 4.8 mu M. This analytical method has been applied to detect Cu(2+ )of the local lake with good accuracy and recovery. (c) 2024 Society of Photo-Optical Instrumentation Engineers (SPIE)