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Understanding growth mechanisms of epitaxial manganese oxide (Mn3O4) nanostructures on strontium titanate (STO) oxide substrates

Published online by Cambridge University Press:  18 March 2015

Jia Yin Liu ,
Xuan Cheng ,
Valanoor Nagarajan  and
Huo Lin Xin
Jia Yin Liu
Affiliation:
School of Materials Science and Engineering, University of New South Wales, Sydney 2052, Australia
Xuan Cheng
Affiliation:
School of Materials Science and Engineering, University of New South Wales, Sydney 2052, Australia
Valanoor Nagarajan*
Affiliation:
School of Materials Science and Engineering, University of New South Wales, Sydney 2052, Australia
Huo Lin Xin
Affiliation:
Brookhaven National Laboratory, Center for Functional Nanomaterials, Upton, New York 11973, USA
*
Address all correspondence to Valanoor Nagarajan at[email protected]
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Abstract

The role of substrate orientation on interface registry and nanocrystal shape has been investigated for epitaxial manganese oxide (Mn3O4) nanocrystals. Mn3O4 (101) nanoplatelets and (112)-orientated nanowires have been successfully deposited on (111) and (110) SrTiO3 (STO) substrates, respectively. Under higher magnifications, the (101) platelets were found to exhibit step-like growth, spiraling outward from a local dislocation site at the Mn3O4–STO interface. Selected area electron diffraction analysis from transmission electron microscope (TEM) was carried out to determine the in-plane edge directionalities of (101) and (112) Mn3O4. We found the (101) Mn3O4 orientation to exhibit a complex in-plane epitaxial relation of $[2\overline {31} ]$Mn3O4//[100]STO and an out-of-plane relation of $[\overline 1 01]$Mn3O4//$[\overline 1 11]$STO. Furthermore, lattice misorientations of 58° in-plane and 35° out-of-plane have been calculated, attributed to the shear caused by the spiral growth. For the (112) Mn3O4 nanowires, the TEM diffraction pattern indicates pyramidal cross-sections based along $[0\overline {11} ]$ STO. Subsequent calculations reveal that the (112) nanowires have their long axis (c-axis) such that [001]Mn3O4//[110]STO. Thus the nanowires grow preferentially along its longest axis giving rise to the observed shape and anisotropic nature.

Type
Research Letters
Information
MRS Communications , Volume 5 , Issue 2 , June 2015 , pp. 277 - 284
Copyright
Copyright © Materials Research Society 2015 

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