Methionine-directed fabrication of gold nanoclusters with yellow fluorescent emission for Cu2+ sensing

摘要: Abstract In the past few years, fluorescent gold nanoclusters (AuNCs) have gained much attention in many areas of physics, chemistry, materials science, and biosciences due to their unique physical, electrical, optical properties. Herein, we reported for first time synthesis water soluble, monodispersed AuNCs by using methionine both as a reductant stabilizer. The synthetic process is green simple, resulting capped (Met-AuNCs) would be biocompatible with bioorganisms. UV–visible absorption, photoluminescence, X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR) were carried out demonstrate chemical composition properties as-prepared Met-AuNCs. Met-AuNCs possess attractive features including intense yellow fluorescence (emission maximum at 530 nm), long lifetime (181 ns 1651 ns), high colloidal stability (pH-, temperature-, salt- time-stability), large Stoke's shift (110 nm), holding great promise late-model analytical tools life science environmental studies. Moreover, as-synthesized can serve an efficient probe selective detection Cu 2+ quenching. limit was determined 7.9 nM linear response over concentrations range from 50 nM 8 μM. Furthermore, new-constructed allows simple rapid soil, results demonstrating its feasibility determination copper real samples.