Reversible and Cyclical Transformation between Solid and Hollow Nanostructures in the Confined Reaction of Manganese Oxide and Silica within a Nano-sized Sphere
SCIE
SCOPUS
- Title
- Reversible and Cyclical Transformation between Solid and Hollow Nanostructures in the Confined Reaction of Manganese Oxide and Silica within a Nano-sized Sphere
- Authors
- Tae-Lin Ha; Jin Goo Kim; Soo Min Kim; Lee, IS
- Date Issued
- 2013-01-30
- Publisher
- ACS
- Abstract
- Annealing of MnO@SiO2 nanospheres in a reducing gas environment resulted in the transformation of the core-shell structure into a hollow structure as a result of outward diffusion of MnO species into the thermodynamically more stable silicate phase. When the hollow silicate nanospheres were oxidized, the interior cavities were refilled with a Mn3O4 phase segregated from the silicate phase, and the hollow structure reverted to the initial core-shell structure. More interestingly, when catalytically active Pt nanocrystals were introduced into the manganese oxide/silica system, the Mn3O4 was readily reduced to the chemically reactive MnO, even at low temperature, which enabled reconversion of the solid nanospheres with a Mn3O4 core to hollow nanostructures during reductive annealing. Therefore, when MnO@SiO2/Pt(II) nanospheres were subjected to an oxidation/reduction cycle by repeatedly switching the flowing gas between air and hydrogen, the nanospheres underwent a reversible change between solid and hollow structures, depending on the gas environment. The solid-to-hollow-to-solid transformation was successfully cycled many times simply by repeatedly switching the flowing gas during annealing.
- Keywords
- LITHIUM-ION BATTERIES; DRUG-DELIVERY; CHEMICAL-TRANSFORMATIONS; THERMODYNAMIC PROPERTIES; FE3O4 NANOPARTICLES; NI NANOPARTICLES; GENERAL STRATEGY; NANOCRYSTALS; METAL; NANOREACTORS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/16027
- DOI
- 10.1021/JA309142J
- ISSN
- 0002-7863
- Article Type
- Article
- Citation
- JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, vol. 135, no. 4, page. 1378 - 1385, 2013-01-30
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