AbstractIt is shown that triangular silver nanoplates (TAgNPs) are viable colorimetric probes for the fast, sensitive and selective detection of Hg(II). Detection is accomplished by reducing Hg(II) ions to elemental Hg so that an Ag/Hg amalgam is formed on the surface of the TAgNPs. This leads to the inhibition of the etching TAgNPs by chloride ions. Correspondingly, a distinct color transition can be observed that goes from yellow to brown, purple, and blue. The color alterations extracted from the red, green, and blue part of digital (RGB) images can be applied to the determination of Hg(II). The relationship between the Euclidean distances (EDs), i.e. the square roots of the sums of the squares of the ΔRGB values, vary in the 5 nM to 100 nM Hg(II) concentration range, and the limit of detection is as low as 0.35 nM. The color changes also allow for a visual estimation of the concentrations of Hg(II). The method is simple in that it only requires a digital camera for data acquisition and a Photoshop software for extracting RGB variations and data processing. Graphical abstractHg2+ detection was achieved by anti-etching of TAgNPs caused by the formation of silver amalgam, along with vivid multicolor variations from yellow to brown, purple, and eventually to be blue.

中文翻译：

---

通过测量蚀刻三角形银纳米片的“之前”和“之后”RGB 图像的颜色变化来比色检测 Hg(II)

摘要表明三角形银纳米片 (TAgNPs) 是一种可行的比色探针，可用于快速、灵敏和选择性检测 Hg(II)。检测是通过将 Hg(II) 离子还原为元素 Hg，从而在 TAgNPs 表面形成 Ag/Hg 汞齐来完成的。这导致氯离子对蚀刻 TAgNP 的抑制。相应地，可以观察到明显的颜色转变，从黄色到棕色、紫色和蓝色。从数字 (RGB) 图像的红色、绿色和蓝色部分提取的颜色变化可用于测定 Hg(II)。欧几里得距离（ED）之间的关系，即ΔRGB值的平方和的平方根，在5 nM至100 nM Hg（II）浓度范围内变化，检测限低至0.35纳米。颜色变化还允许对 Hg(II) 的浓度进行目视估计。该方法很简单，因为它只需要一个用于数据采集的数码相机和一个用于提取 RGB 变化和数据处理的 Photoshop 软件。图形抽象 Hg2+ 检测是通过由银汞合金的形成引起的 TAgNP 的抗蚀刻以及从黄色到棕色、紫色和最终变为蓝色的生动多色变化来实现的。