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Lee, KyungSig,Anisur, Rahman Md,Kim, Ki Woong,Kim, Won Sun,Park, Tae-Joon,Kang, Eun Joo,Lee, In Su American ChemicalSociety 2012 Chemistry of materials Vol.24 No.4
<P>A family of Fe<SUB>3</SUB>O<SUB>4</SUB>/MnO hybrid nanocrystalsdiffering in heterojunction structure and number of MnO domains weresynthesized through the seed-mediated growth process of MnO at thesurface of Fe<SUB>3</SUB>O<SUB>4</SUB> nanocrystal. In this process,the resulting heterostructures, including core/shell, dumbbell-like,and flowerlike structures, were found to be largely influenced bythe size of initially injected Fe<SUB>3</SUB>O<SUB>4</SUB> seeds.The further transformation of Fe<SUB>3</SUB>O<SUB>4</SUB>/MnO heterodimerthrough a nanoscale etching process within silica nanosphere generatedthe nanoreactor framework composed of a superparamagnetic Fe<SUB>3</SUB>O<SUB>4</SUB> nanocrystal, a functionalized cavity with a catalyticallyactive Mn<SUB>3</SUB>O<SUB>4</SUB> layer, and a porous silica shell.The newly developed nanoreactor successfully catalyzed the cyanosilylationreaction of aromatic aldehydes in a size selective manner and couldbe recovered magnetically and reused without loss of catalytic activityeven after ten successive cycles.</P><P>A family of Fe<SUB>3</SUB>O<SUB>4</SUB>/MnO hybrid nanocrystalsdiffering in heterojunction structure was synthesized through theseed-mediated growth process on the Fe<SUB>3</SUB>O<SUB>4</SUB> nanocrystalwith various sizes. The heterodimer nanocrystal was employed for thefabrication of a nanoreactor, which selectively catalyzed the cyanosilylationreaction and could be magnetically recovered and reused in multipleiterations.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/cmatex/2012/cmatex.2012.24.issue-4/cm2027724/production/images/medium/cm-2011-027724_0010.gif'></P>