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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 May 24, 2007. Revised Manuscript Received July 10, 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).

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October 25, 2023