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 (H₂S), based on analyte-induced photoluminescence quenching through the formation of CuS nanoparticles. The probe allows the detection of H₂S, with a linear range of 1-100 μM and a limit of detection (signal-to-noise ratio = 3) of 500 nM. The practicality of this probe has been validated through the analysis of hot spring water samples.
Jia-Ying
JY
Ma
Po-Cheng
PC
Chen
Huan-Tsung
HT
Chang
D003300:Copper / Q000737:chemistry*; D045482:Hot Springs / Q000032:analysis; D006862:Hydrogen Sulfide / Q000032:analysis* / Q000737:chemistry; D008163:Luminescent Measurements / Q000379:methods*; D053758:Nanoparticles / Q000737:chemistry*; D010396:Penicillamine / Q000737:chemistry*; D014867:Water / Q000032:analysis
D014867:Water; D003300:Copper; D010396:Penicillamine; D006862:Hydrogen Sulfide