We report on a plasmonic probe for detection of ultra-trace amounts of Se(IV) based on morphological transformation of silver nanoprisms (AgNPRs). AgNPRs were synthesized in a mild condition and characterized by UV–vis absorption spectroscopy and transmission electron microscopy (TEM). It was found that in the presence of Se(IV), SPR peak of AgNPRs at 720 nm shifts to lower wavelengths and the color of solution changes from light blue to violet. This is due to the shape transformation of AgNPRs to nanodisks which is proved by TEM images, and probably results from the etching of corners of NPRs by selenite ions. Based on this phenomenon, a sensitive colorimetric probe was developed for determination of Se(IV) in the concentration range of 2.5–100 μg L⁻¹ with a detection limit of 1.2 μg L^-1. The developed method was applied for analysis of water and food samples.

我们报告了一种基于银纳米棱镜（AgNPRs）形态转变的超痕量Se（IV）检测等离激元探针。AgNPRs在温和的条件下合成，并通过紫外可见吸收光谱和透射电子显微镜（TEM）进行表征。发现在存在Se（IV）的情况下，AgNPR的720nm处的SPR峰移动到较低的波长，并且溶液的颜色从浅蓝色变为紫色。这是由于TEM图像证明了AgNPRs向纳米盘的形状转变，这可能是由于亚硒酸盐离子对NPRs角的蚀刻所致。基于这种现象，一个灵敏的比色探针用于测定硒（IV）的中的2.5-100微克L范围开发^-1具有1.2微克升的检测限^-1。所开发的方法用于水和食物样品的分析。