A New Update in Making Nanomembranes of 'Smart' Materials UMNews
By Hussain AhmedJan 5 2023Reviewed by Megan Craig, M.Sc. The epitaxy of functional oxides on a graphene-coated substrate is preferred for enhancing structural qualities and generating freestanding epitaxial nanoscale membranes for scientific research, applications, and cost-effective substrate repurposing.
Limitations of Conventional Epitaxy The epilayer is tightly attached to the substrate in conventional epitaxial growth, limiting the reusability of the costly single-crystal substrate unless the coating is removed by polishing. A more accurate process employs a sacrificial layer between the film and substrate. When removed, this sacrificial layer liberates the thin film as a standalone membrane. For removing the sacrificial layer, heat or selective etching may be used.
Advances in Molecular Beam Epitaxy of Perovskite Oxides With the chemical adaptability and functional versatility of perovskite oxides, it is desirable to extend distant epitaxial growth to perovskite oxides to possibly increase structural qualities and explore freestanding membranes. The elevated vapor pressure of titanium tetraisopropoxide or its decomposed intermediates offers a desorption technique that self-regulates the stoichiometry of Sr:Ti cation and provides an epitaxial growth window in which the integrated Sr:Ti ratio is unity and resistant to flux instabilities.
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