title: Iron oxide nanoparticle layer templated by polydopamine spheres: a novel scaffold toward hollow-mesoporous magnetic nanoreactors.
abstract: Superparamagnetic iron oxide nanoparticle layers with high packing density and controlled thickness were in situ deposited on metal-affinity organic templates (polydopamine spheres), via one-pot thermal decomposition. The as synthesized hybrid structure served as a facile nano-scaffold toward hollow-mesoporous magnetic carriers, through surfactant-assisted silica encapsulation and its subsequent calcination. Confined but accessible gold nanoparticles were successfully incorporated into these carriers to form a recyclable catalyst, showing quick magnetic response and a large surface area (642.5 m(2) g(-1)). Current nano-reactors exhibit excellent catalytic performance and high stability in reduction of 4-nitrophenol, together with convenient magnetic separability and good reusability. The integration of compact iron oxide nanoparticle layers with programmable polydopamine templates paves the way to fabricate magnetic-response hollow structures, with high permeability and multi-functionality.
authors.affiliation: Guangdong Key Laboratory of Nanomedicine, Institute of Biomedicine and Biotechnology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, P. R. China. wu.su@siat.ac.cn.
authors.forename: Liang
authors.initials: L
authors.lastname: Huang
authors.forename: Lijiao
authors.initials: L
authors.lastname: Ao
authors.forename: Xiaobin
authors.initials: X
authors.lastname: Xie
authors.forename: Guanhui
authors.initials: G
authors.lastname: Gao
authors.forename: Mohamed F
authors.initials: MF
authors.lastname: Foda
authors.forename: Wu
authors.initials: W
authors.lastname: Su