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Self‐Limiting Assembly of Au Nanoparticles Induced by Localized Dynamic Metal‐Phenolic Interactions
Author(s) -
Su Jiaojiao,
Huang Xin,
Yang Ming
Publication year - 2020
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.202000842
Subject(s) - tannic acid , chemistry , ethylenediaminetetraacetic acid , nanoparticle , ferric , chelation , ionic bonding , self assembly , ligand (biochemistry) , metal , metal ions in aqueous solution , limiting , nitrilotriacetic acid , nanotechnology , inorganic chemistry , combinatorial chemistry , ion , chemical engineering , organic chemistry , materials science , mechanical engineering , engineering , biochemistry , receptor
Dynamic nanoparticle assembly represents an important platform for the creation of functional materials with stimuli‐responsive properties. In this work, we show that small Au nanoparticles (ca. 5 nm) with mixed surface ligands (citrates and tannic acid) may be assembled into quasi‐sphere‐like superstructures (ca. 50 nm) induced by the presence of ferric ions. The spontaneous self‐limiting assembly is enabled by the localized metal‐phenolic interactions as a result of the possible phase separation of citrates and tannic acid on the surface of Au nanoparticles, restricting the growth of ionic cross‐linking network. The disassembly may be further achieved by adding ethylenediaminetetraacetic acid as a stronger chelation ligand for ferric ions, allowing the reversible assembly and disassembly of Au nanoparticles. Our results provide new insights into the design of dynamic plasmonic assemblies by manipulating the nature of surface ligands.