Abstract：
Intraparticle ion motions are critical to the structure and properties of nanomaterials, but rarely disclosed. Herein, in situ visualization of ion motions in a single nanoparticle is presented by dark-field microscopy imaging, which shows HgCl2 -induced structural transformation of amorphous selenium nanoparticles (SeNPs) with the main composition of Se8 . Owing to the high binding affinity with selenium and coulomb interactions, Hg2+ ions can permeate into the interior of SeNPs, making the amorphous Se8 turn to polycrystalline Hg3 Se2 Cl2 . As a proof of concept, SeNPs then serve as a highly effective scavenger for selective removal of Hg2+ ions from solution. This new finding offers visual proof for the photophysical process involving intraparticle ion motion, demonstrating that tracking the ion motions is a novel strategy to comprehend the formation mechanism with the purpose of developing new nanostructures like nanoalloys and nano metal compounds.
摘要：
粒子内离子运动对纳米材料的结构和性能至关重要，但很少透露。在这里，通过暗场显微镜成像呈现单个纳米粒子中离子运动的原位可视化，这表明HgCl2诱导的以Se8为主要成分的无定形硒纳米颗粒（SeNPs）的结构转变。由于与硒和库仑相互作用的高结合亲和力，Hg2+离子可以渗透到SeNPs的内部，使无定形Se8转变为多晶Hg3Se2Cl2。作为概念的证明，然后,SeNP用作从溶液中选择性去除Hg2+离子的高效清除剂。这项新发现为涉及粒子内离子运动的光物理过程提供了视觉证据，证明跟踪离子运动是一种理解形成机制的新策略，目的是开发新的纳米结构，如纳米合金和纳米金属化合物。
