Single Nanoparticle to 3D Supercage: Framing for an Artificial Enzyme System

作者：Ren Cai, Dan Yang, Shengjie Peng, Xigao Chen, Yun Huang, Yuan Liu, Weijia Hou, Shengyuan Yang, Zhenbao Liu, Weihong Tan · 发表于：Journal of the American Chemical Society · 年份：2015 · DOI：10.1021/jacs.5b09337 · 被引用次数：124 · 研究领域：Advanced Nanomaterials in Catalysis、Nanocluster Synthesis and Applications、Electrochemical sensors and biosensors

A facile strategy has been developed to fabricate Cu(OH)2 supercages (SCs) as an artificial enzyme system with intrinsic peroxidase-mimic activities (PMA). SCs with high catalytic activity and excellent recyclability were generated via direct conversion of amorphous Cu(OH)2 nanoparticles (NPs) at room temperature. More specifically, the process that takes a single nanoparticle to a 3D supercage involves two basic steps. First, with addition of a copper-ammonia complex, the Cu(2+) ions that are located on the surface of amorphous Cu(OH)2 NPs would evolve into a fine lamellar structure by coordination and migration and eventually convert to 1D nanoribbons around the NPs. Second, accompanied by the migration of Cu(2+), a hollow cavity is generated in the inner NPs, such that a single nanoparticle eventually becomes a nanoribbon-assembled 3D hollow cage. These Cu(OH)2 SCs were then engineered as an artificial enzymatic system with higher efficiency for intrinsic PMA than the peroxidase activity of a natural enzyme, horseradish peroxidase.