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

机译：青霉素胺-铜纳米簇聚集体的光致发光猝灭检测硫化氢

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摘要

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 ligandto-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_2S), based on analyteinduced photoluminescence quenching through the formation of CuS nanoparticles. The probe allows the detection of H_2S, with a linear range of 1-100 μM and a limit of detection (signal-tonoise ratio = 3) of 500 nM. The practicality of this probe has been validated through the analysis of hot spring water samples.
机译：我们开发了一种一锅式，廉价，简单且快速的方法，该方法可从含青霉胺（PA）的65％（vv〜（？1））二甲基甲酰胺水溶液中的Cu〜（2+）离子合成光致发光铜纳米簇（Cu NC）聚集体。 ）作为封盖剂和还原剂。制备的PA-Cu NC聚集体在326 nm激发时在580 nm处发射，量子产率为2.0％。 PA-Cu NC聚集体的光致发光源自配体到金属的电荷转移，这由长寿命（126.5 ns）和大斯托克斯位移（254 nm）来支持。在各种有机水溶液中，制得的PA-Cu NC聚集体具有不同的发射波长和相同的激发波长。 PA-Cu NC聚集体具有高度选择性，并且对硫化氢（H_2S）的检测非常敏感，这是基于分析物引起的通过形成CuS纳米颗粒而导致的光致发光猝灭。该探针可检测H_2S，线性范围为1-100μM，检测极限（信号-音比= 3）为500 nM。该探针的实用性已通过对温泉水样品的分析得到验证。

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