Issue 42, 2009

Selective heterogeneous oriented attachment of manganese oxidenanorods in water: toward 3D nanoarchitectures

Abstract

MnOOH and MnO2 polymorphs are synthesized using a reaction between Mn2+and MnO4 in water at low temperature (95 °C). Nanoparticles are characterized using powder XRD, TEM and electron diffraction. Depending on the acidity of the aging medium, γ-MnO2 compounds are shown to be obtained as nanorods (final pH = 2.0) or hollow nanocones (3.6 ≤ final pH ≤ 4.5). The external faces of the cones originate from heterogeneous oriented attachment of α-MnOOH nanorods on early cones. The selective attachment between (−110)γ–MnO2 and (101)α–MnOOH faces is discussed by taking into account the surface charge of the primary particles and the reactivity of the MnOHx surface groups. This study underlines the role of the electrostatic repulsions and the surface reactivity in the oriented attachment mechanism in water for oxides.

Graphical abstract: Selective heterogeneous oriented attachment of manganese oxide nanorods in water: toward 3D nanoarchitectures

Supplementary files

Article information

Article type
Paper
Submitted
18 May 2009
Accepted
31 Jul 2009
First published
09 Sep 2009

J. Mater. Chem., 2009,19, 7947-7954

Selective heterogeneous oriented attachment of manganese oxide nanorods in water: toward 3D nanoarchitectures

D. Portehault, S. Cassaignon, E. Baudrin and J. Jolivet, J. Mater. Chem., 2009, 19, 7947 DOI: 10.1039/B909761A

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Spotlight

Advertisements