A Au-Ga alloy layer is synthesized on a Au sheet substrate at low temperature and a new nanoporous Au material is then prepared based on Ga removal from the Au-Ga alloy by a electrochemical method. X-ray diffraction analysis confirms that the grains of the newly formed Au layer are refined and scanning electron microscopy suggests that the newly formed Au layer has a nanoporous structure with a pore size of∼16 nm. The cyclic voltammetry curve of the prepared nanoporous Au in a 1 M KCl solution presents a square structure of a supercapacitor with a specific capacitance of mF·cm^-2, which is 86 times that of the smooth Au electrode. The 4-mercaptobenzoic acid (4-MBA) modified nanoporous Au material is used as a Raman substrate to detect Hg²⁺ with surface-enhanced Raman scattering. from 1.0×10⁻¹⁰ mol·L^-1 to 1.0×10⁻⁵ mol·L^-1), and the limit of detection is 1.0×10⁻¹⁰ mol·L^-1.

中文翻译：

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痕量 Hg2+ 在 4-巯基苯甲酸修饰的纳米多孔 Au 基材上的表面增强拉曼散射

在Au片基板上低温合成Au-Ga合金层，然后通过电化学方法从Au-Ga合金中去除Ga制备新的纳米多孔Au材料。X 射线衍射分析证实新形成的 Au 层的晶粒细化，扫描电子显微镜表明新形成的 Au 层具有纳米孔结构，孔径约为 16 nm。制备的纳米多孔Au在1 M KCl溶液中的循环伏安曲线呈方形超级电容器结构，比电容为mF·cm ^-2，是光滑Au电极的86倍。4-巯基苯甲酸 (4-MBA) 修饰的纳米多孔 Au 材料用作拉曼底物检测 Hg ²⁺表面增强拉曼散射。1.0×10 ^-10 mol·L ^-1至1.0×10 ^-5 mol·L ^-1 )，检测限为1.0×10 ^-10 mol·L ^-1。