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Precise Self-Assembly and Controlled Catalysis of Thermoresponsive Core–Satellite Multicomponent Hybrid Nanoparticles

Tian, Jia, Huang, Baoxuan, Zhang, Weian
Langmuir 2018 v.35 no.1 pp. 266-275
aminophenols, catalytic activity, gold, magnetite, nanogold, nanoparticles, p-nitrophenol, polymerization, polymers, satellites, temperature
The construction of multicomponent hybrid nanomaterials with well-controlled architecture, especially bearing an ordered homogeneity and distribution of the subunits with tunable functions, is a key challenge in chemistry and material science. Herein, we reported a versatile and novel strategy to fabricate core–satellite multicomponent nanostructures with tunable interparticle distances and catalysis properties by the combination of surface-initiated reversible addition–fragmentation chain transfer (SI-RAFT) polymerization and self-assembly. The arrangement and interparticle distance of gold satellites could be precisely tuned by the SI-RAFT polymerization process and the feeding ratio of gold nanoparticles (AuNPs) and the core nanoparticle. It is worth to note that multilayered core–satellite nanostructures have been fabricated by a high-feeding ratio of AuNPs and magnetite NP (MNP)@SiO₂–PNIPAm. Notably, the core–satellite MNP@SiO₂–PNIPAm–Au nanoparticles exhibited excellent thermoresponsive behaviors with the change of temperature. Furthermore, the catalytic efficiency of MNP@SiO₂–PNIPAm–Au nanoparticles via the reduction of 4-nitrophenol to 4-aminophenol can be well modulated by the nanoparticle size, temperature, and polymer feed ratio. This strategy for precise construction of core–satellite nanostructures would open a new pathway to construct multicomponent functional nanostructures.