Detection of hydrogen sulfide through photoluminescence quenching of penicillamine-copper nanocluster aggregates

We have developed a one-pot, inexpensive, simple and rapid method to synthesize photoluminescent copper nanocluster (Cu NC) aggregates from Cu 2+ ions in 65% (v v −1 ) dimethylformamide aqueous solution containing penicillamine (PA) as a capping and reducing agent. As-prepared PA-Cu NC aggregates emit at 580 nm when excited at 326 nm, with a quantum yield of 2.0%. The photoluminescence of PA-Cu NC aggregates originate from ligand-to-metal charge transfer, which is supported by a long lifetime (126.5 ns) and a large Stokes shift (254 nm). As-prepared PA-Cu NC aggregates have different emission wavelengths with the same excitation wavelength in various organic-aqueous solutions. The PA-Cu NC aggregates are highly selective and sensitive to the detection of hydrogen sulfide (H 2 S), based on analyte-induced photoluminescence quenching through the formation of CuS nanoparticles. The probe allows the detection of H 2 S, with a linear range of 1–100...

Jia-Ying Ma, Po-Cheng Chen and Huan-Tsung Chang

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