A new colorimetric assay for the detection of sulfide anions with high sensitivity and selectivity is reported, utilizing Au-Hg alloy nanorods (Au-HgNRs) as probe. Au-HgNRs were prepared by modifying gold nanorods (AuNRs) with reducing agent and mercury ions. In an aqueous solution with sulfide anions, the formation of mercuric sulfide due to redox reaction between the amalgams and sulfide anions greatly changed the surface chemistry and morphology of the Au-HgNRs, leading to a red shift of the localized surface plasmon resonance (LSPR) absorption peak, accompanied by a change in colorimetric response. A good linear relationship was obtained between the LSPR peak wavelength shift and concentration of sulfide anion in the range of 1 × 10⁻⁵−1 × 10⁻⁴mol/L. The selectivity of this method has been investigated by other anions. The colorimetric sensing system successfully detected sulfide in wastewater from leather industry.

中文翻译：

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通过氧化还原调制的表面化学和Au-Hg纳米棒的形态比色检测硫化物阴离子。

报道了一种新的比色测定法，以Au-Hg合金纳米棒（Au-HgNRs）为探针，可高灵敏度和选择性地检测硫化物阴离子。Au-HgNRs通过用还原剂和汞离子修饰金纳米棒（AuNRs）制备。在含硫化物阴离子的水溶液中，由于汞齐和硫化物阴离子之间的氧化还原反应而形成的硫化汞大大改变了Au-HgNRs的表面化学和形态，导致局部表面等离子体激元共振（LSPR）发生红移吸收峰，伴随着比色响应的变化。LSPR峰波长偏移与硫化物阴离子浓度在1×10 ^-5 -1×10 ^-4范围内获得良好的线性关系摩尔/升。该方法的选择性已被其他阴离子研究。比色传感系统成功地检测了皮革工业废水中的硫化物。