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    Organized assembling of poly(ethylene glycol)-functionalized Janus nanoparticles induced by select alkali metal ions

    Year: 2019

    Journal: Inorg. Chem. Commun., Volume 110, DEC

    Authors: Lu, Jia En; Chen, Shaowei

    Organizations: National Science FoundationNational Science Foundation (NSF) [CHE-1710408, CBET-1848841]

    Keywords: Janus nanoparticle; Poly(ethylene glycol); Alkali metal ion; Organized ensemble; Self-assembly

    Gold Janus nanoparticles were prepared by interfacial ligand exchange, with hydrophilic poly(ethylene glycol) (PEG) ligands on one hemisphere and hydrophobic hexanethiolates on the other. Due to specific interaction of PEG with alkali metal ions, the Janus nanoparticles exhibited marked conformational changes forming organized ensembles in the presence of Na+ and K+, as manifested in dynamic light scattering, UV-vis absorption and transmission electron microscopic measurements, whereas no apparent variation was observed with other alkali metal ions (e.g., Li+, Rb+), bulk-exchange nanoparticles where the two types of capping ligands were homogeneously mixed on the nanoparticle surface, or nanoparticles capped with the PEG ligands alone. The ion complexation was further probed in NMR measurements. Results from this study indicate that select doping of alkali metal ions into PEG-functionalized nanoparticles may be used for controlled assembly of the Janus nanoparticles.
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