title: Asymmetric silica encapsulation toward colloidal Janus nanoparticles: a concave nanoreactor for template-synthesis of an electocatalytic hollow Pt nanodendrite.
abstract: A novel reverse microemulsion strategy was developed to asymmetrically encapsulate metal-oxide nanoparticles in silica by exploiting the self-catalytic growth of aminosilane-containing silica at a single surface site. This strategy produced various colloidal Janus nanoparticles, including Au/Fe3O4@asy-SiO2, which were converted to an Au-containing silica nanosphere, Au@con-SiO2, by reductive Fe3O4 dissolution. The use of Au@con-SiO2 as a metal-growing nanoreactor allowed the templated synthesis of various noble-metal nanocrystals, including a hollow dendritic Pt nanoshell which exhibits significantly better electrocatalytic activities for the oxygen reduction reaction than commercial Pt/C catalysts.
authors.affiliation: Department of Chemistry, Pohang University of Science and Technology (POSTECH), Gyeogbuk 790-784, Korea. insulee97@postech.ac.kr.
authors.forename: Jung Hun
authors.initials: JH
authors.lastname: Koo
authors.forename: Daun
authors.initials: D
authors.lastname: Kim
authors.forename: Jin Goo
authors.initials: JG
authors.lastname: Kim
authors.forename: Hwakyeung
authors.initials: H
authors.lastname: Jeong
authors.forename: Jongwon
authors.initials: J
authors.lastname: Kim
authors.forename: In Su
authors.initials: IS
authors.lastname: Lee