Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published October 2, 2007 | public
Journal Article

Epitaxial Manganese Oxide Thin Films with Connected Porosity: Topotactic Induction of Crystallographic Pore Alignment


Epitaxial thin films of ZnMn_2O_4, grown from an aqueous solution on (100) and (111) spinel MgAl_2O_4 substrates, have been topotactically reduced and leached to produce epitaxial rock salt MnO on the same substrates. The volume change accompanying the conversion of ZnMn_2O_4 to 2MnO associated with a loss of Zn and O_2 manifests as a network of interconnected, 50−100 nm pores. The topotactic nature of the transformation ensures that the pores are crystallographically aligned with the substrate:  on the (100) MgAl_2O_4 substrate, pores with rectangular cross-sections are aligned parallel to the surface normal. On the (111) MgAl_2O_4 substrate, the pores are aligned at constant, fixed angles with respect to the substrate normal.

Additional Information

© 2007 American Chemical Society. Received 24 May 2007. Published online 28 August 2007. Published in print 1 October 2007. We thank Adele Tamboli for helpful suggestions. E.S.T. is supported by an NSF IGERT Fellowship (DGE 9987618) and M.G. is supported by a RISE undergraduate fellowship. We gratefully acknowledge support from the donors of the American Chemical Society Petroleum Research Fund and the National Science Foundation for a Chemical Bonding Center (CHE 0434567) and for use of MRSEC facilities (DMR 0520415).

Additional details

August 19, 2023
October 24, 2023