In this work, we fabricated gold nanoparticles (AuNPs) capped with both polyvinyl pyrrolidone (PVP) and iodine (I₂) to act as efficient chemiluminescent coreactants for luminol. AuNPs synthesis was based on the direct chemical reduction of Au³⁺ with NaBH₄ in the presence of PVP-I₂ complex. The successful synthesis of PVP-I₂@AuNPs was confirmed with scanning electron microscopy (SEM) and UV-vis spectrophotometry. Chemiluminescence (CL) intensity of luminol was greatly enhanced, upon its chemical reaction with chemisorbed I₂ on AuNPs surfaces owing to the excellent catalytic activity of AuNPs. The PVP-I₂@AuNPs/luminol CL sensing system was successfully applied for determination of Hg²⁺ ions and the results displayed linearity in a wide range from 0.5 to 2000 nM and an ultrasensitive response to 1.0 nM Hg²⁺. The detection limit of Hg²⁺ ions was 0.1 nM, which was 100 times lower than the limit value (10 nM) defined by the U.S. Environmental Protection Agency in drinkable water. This ultrasensitive luminogenic system for Hg²⁺ detection also exhibited excellent selectivity among 13 types of metals, suggesting that the luminol/PVP-I₂@AuNPs system is a promising sensor for real-time detection of Hg²⁺.

在这项工作中，我们制备了同时被聚乙烯吡咯烷酮（PVP）和碘（I ₂）覆盖的金纳米颗粒（AuNPs），以作为鲁米诺的有效化学发光共反应剂。AuNPs的合成基于在PVP-1 _2配合物存在下用NaBH ₄直接化学还原Au ^3+的方法。通过扫描电子显微镜（SEM）和紫外可见分光光度法证实了PVP-1 ₂ @AuNPs的成功合成。由于AuNPs具有出色的催化活性，在与AuNPs表面化学吸附的I ₂发生化学反应后，鲁米诺的化学发光（CL）强度大大提高。PVP-I ₂@ AuNPs / luminol CL传感系统成功应用于Hg ²⁺离子的测定，结果显示线性范围从0.5到2000 nM，对1.0 nM Hg ²⁺具有超灵敏响应。Hg ²⁺离子的检出限为0.1 nM，比美国环境保护局在饮用水中规定的限值（10 nM）低100倍。这种用于Hg ²⁺检测的超灵敏发光系统在13种金属中也表现出出色的选择性，这表明luminol / PVP-I ₂ @AuNPs系统是实时检测Hg ²⁺的有希望的传感器。