期刊
NANOTECHNOLOGY
卷 25, 期 19, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/25/19/195502
关键词
copper nanoclusters; penicillamine; hydrogen sulfide; hot spring water
资金
- National Science Council of Taiwan [NSC101-2113-M-002-002-MY3]
We have developed a one-pot, inexpensive, simple and rapid method to synthesize photoluminescent copper nanocluster (Cu NC) aggregates from Cu2+ 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 mu M 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.
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