Seed Size-Dependent Formation of Fe3O4/MnO Hybrid Nanocrystals: Selective, Magnetically Recyclable Catalyst Systems
SCIE
SCOPUS
- Title
- Seed Size-Dependent Formation of Fe3O4/MnO Hybrid Nanocrystals: Selective, Magnetically Recyclable Catalyst Systems
- Authors
- Kyung Sig Lee; Rahman Md Anisur; Ki Woong Kim; Won Sun Kim; Tae-Joon Park; Eun Joo Kang; Lee, IS
- Date Issued
- 2012-02-28
- Publisher
- ACS
- Abstract
- A family of Fe3O4/MnO hybrid nanocrystals differing in heterojunction structure and number of MnO domains were synthesized through the seed-mediated growth process of MnO at the surface of Fe3O4 nanocrystal. In this process, the resulting heterostructures, including core/shell, dumbbell-like, and flowerlike structures, were found to be largely influenced by the size of initially injected Fe3O4 seeds. The further transformation of Fe3O4/MnO heterodimer through a nanoscale etching process within silica nanosphere generated the nanoreactor framework composed of a superparamagnetic Fe3O4 nanocrystal, a functionalized cavity with a catalytically active Mn3O4 layer, and a porous silica shell. The newly developed nanoreactor successfully catalyzed the cyanosilylation reaction of aromatic aldehydes in a size selective manner and could be recovered magnetically and reused without loss of catalytic activity even after ten successive cycles.
- Keywords
- hybrid nanocrystal; manganese; iron; nanocatalyst; recyclable catalyst; MONODISPERSE NANOCRYSTALS; NANOPARTICLES; HETEROSTRUCTURES; HETERODIMERS; GROWTH; SHELL
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/16805
- DOI
- 10.1021/CM2027724
- ISSN
- 0897-4756
- Article Type
- Article
- Citation
- CHEMISTRY OF MATERIALS, vol. 24, no. 4, page. 682 - 687, 2012-02-28
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