1. Twinning Driven Growth of Manganese Oxide Hollow Cones through Self-Assembly of Nanorods in Water
- Author
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David Portehault, Emmanuel Baudrin, Jean-Pierre Jolivet, Sophie Cassaignon, Laboratoire de Chimie de la Matière Condensée de Paris (site Paris VI) (LCMCP (site Paris VI)), Université Pierre et Marie Curie - Paris 6 (UPMC)-Collège de France (CdF (institution))-Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire réactivité et chimie des solides - UMR CNRS 7314 (LRCS), Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Laboratoire de Chimie de la Matière Condensée de Paris (LCMCP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Collège de France (CdF (institution))-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and Université de Picardie Jules Verne (UPJV)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Materials science ,Precipitation (chemistry) ,Oxide ,02 engineering and technology ,General Chemistry ,[CHIM.INOR]Chemical Sciences/Inorganic chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,0104 chemical sciences ,Crystallography ,chemistry.chemical_compound ,chemistry ,Electron diffraction ,Transmission electron microscopy ,Phase (matter) ,General Materials Science ,Nanorod ,Self-assembly ,0210 nano-technology ,Crystal twinning ,ComputingMilieux_MISCELLANEOUS - Abstract
Hollow γ-MnO2 nanocones are synthesized by precipitation in water at 95 °C through a “one-pot” procedure. Characterization of the particles is carried out using powder XRD, electron diffraction, FESEM, and TEM. The hexagonal-shaped base is shown to originate from specific {021} twinning. The growth mechanism is investigated and proposed to proceed through two steps. The first stage involves the growth of pyramidal seeds that direct the final shape of the particles. The second stage proceeds through oriented attachment of primary α-MnOOH nanorods on previously formed γ-MnO2 cones. Attachment is accompanied by phase transformation of the oxyhydroxide to the oxide by a topotactic reaction, because of the structural relations between both structures. This study reports on the first demonstration of specific twinning from oriented attachment. This also provides a deep insight into the role of structural defects for further design of complex and novel architectures. Additionally, the procedure developed herein ...
- Published
- 2009