title: Galvanic replacement reactions in metal oxide nanocrystals.
abstract: Galvanic replacement reactions provide a simple and versatile route for producing hollow nanostructures with controllable pore structures and compositions. However, these reactions have previously been limited to the chemical transformation of metallic nanostructures. We demonstrated galvanic replacement reactions in metal oxide nanocrystals as well. When manganese oxide (Mn3O4) nanocrystals were reacted with iron(II) perchlorate, hollow box-shaped nanocrystals of Mn3O4/γ-Fe2O3 ("nanoboxes") were produced. These nanoboxes ultimately transformed into hollow cagelike nanocrystals of γ-Fe2O3 ("nanocages"). Because of their nonequilibrium compositions and hollow structures, these nanoboxes and nanocages exhibited good performance as anode materials for lithium ion batteries. The generality of this approach was demonstrated with other metal pairs, including Co3O4/SnO2 and Mn3O4/SnO2.
authors.affiliation: Center for Nanoparticle Research, Institute for Basic Science (IBS), and School of Chemical and Biological Engineering, Seoul National University, Seoul 151-742, Korea.
authors.forename: Myoung Hwan
authors.initials: MH
authors.lastname: Oh
authors.forename: Taekyung
authors.initials: T
authors.lastname: Yu
authors.forename: Seung-Ho
authors.initials: SH
authors.lastname: Yu
authors.forename: Byungkwon
authors.initials: B
authors.lastname: Lim
authors.forename: Kyung-Tae
authors.initials: KT
authors.lastname: Ko
authors.forename: Marc-Georg
authors.initials: MG
authors.lastname: Willinger
authors.forename: Dong-Hwa
authors.initials: DH
authors.lastname: Seo
authors.forename: Byung Hyo
authors.initials: BH
authors.lastname: Kim
authors.forename: Min Gee
authors.initials: MG
authors.lastname: Cho
authors.forename: Jae-Hoon
authors.initials: JH
authors.lastname: Park
authors.forename: Kisuk
authors.initials: K
authors.lastname: Kang
authors.forename: Yung-Eun
authors.initials: YE
authors.lastname: Sung
authors.forename: Nicola
authors.initials: N
authors.lastname: Pinna
authors.forename: Taeghwan
authors.initials: T
authors.lastname: Hyeon
mesh_terms: D003035:Cobalt / Q000737:chemistry; D005290:Ferric Compounds / Q000737:chemistry*; D017895:Manganese Compounds / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure*; D046529:Microscopy, Electron, Transmission; D010087:Oxides / Q000737:chemistry*; D010472:Perchlorates / Q000737:chemistry; D017971:Tin Compounds / Q000737:chemistry
chemical_list: D005290:Ferric Compounds; D017895:Manganese Compounds; D010087:Oxides; D010472:Perchlorates; D017971:Tin Compounds; C001473:iron perchlorate; C000499:ferric oxide; D003035:Cobalt; C027424:manganese oxide; C045358:stannic oxide; C060728:cobalt oxide