Rock Salt vs. Wurtzite Phases of Co1-xMnxO: Control of Crystal Lattice and Morphology at the Nanoscale

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dc.contributor.advisorWhitmire, Kenton H.
dc.contributor.committeeMemberWilson, Lon J.
dc.contributor.committeeMemberWong, Michael S.
dc.creatorWalsh, Sean
dc.date.accessioned2013-07-24T19:49:52Z
dc.date.accessioned2013-07-24T19:50:03Z
dc.date.available2013-07-24T19:49:52Z
dc.date.available2013-07-24T19:50:03Z
dc.date.created2012-12
dc.date.issued2013-07-24
dc.date.submittedDecember 2012
dc.date.updated2013-07-24T19:50:03Z
dc.description.abstractDiamond cuboid-, rhombohedron- and hexagon-shaped nanocrystals as well as branched rods of the solid solution Co1-xMnxO have been synthesized via a solvothermal synthetic route from manganese formate and cobalt acetate at elevated temperature. Rhombohedra and hexagons have dimensions no larger than 50 nm on the longest axis, rods have branches up to 150 nm long and cuboids grow up to 250 nm on a side. X-ray and electron diffraction and transmission electron microscopy analyses show that these nanoparticles are single crystals of wurtzite-type and rock salt-type Co1-xMnxO. Varying the surfactant, water and precursor ratios allows control of particle size, morphology and stoichiometry. Extending growth time at high temperatures (>370°C) leads to the disappearance of the wurtzite phase due to Ostwald ripening. Longer reaction times at temperatures between 345-365°C lead to more crystalline wurtzite-lattice particles. These results show that nanoparticle morphologies and crystal lattices arise from crystal growth and Ostwald ripening at different rates selecting for either small, smooth-surfaced wurtzite lattice particles or large, dendritically-grown rock salt lattice particles.
dc.format.mimetypeapplication/pdf
dc.identifier.citationWalsh, Sean. "Rock Salt vs. Wurtzite Phases of Co1-xMnxO: Control of Crystal Lattice and Morphology at the Nanoscale." (2013) Diss., Rice University. <a href="https://hdl.handle.net/1911/71699">https://hdl.handle.net/1911/71699</a>.
dc.identifier.slug123456789/ETD-2012-12-238
dc.identifier.urihttps://hdl.handle.net/1911/71699
dc.language.isoeng
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.
dc.subjectWurtzite
dc.subjectRock salt
dc.subjectPolymorphism
dc.subjectNanomaterials
dc.subjectMixed-metal oxide
dc.subjectSolvothermal
dc.subjectCobalt oxide
dc.subjectManganese oxide
dc.titleRock Salt vs. Wurtzite Phases of Co1-xMnxO: Control of Crystal Lattice and Morphology at the Nanoscale
dc.typeThesis
dc.type.materialText
thesis.degree.departmentChemistry
thesis.degree.disciplineNatural Sciences
thesis.degree.grantorRice University
thesis.degree.levelDoctoral
thesis.degree.nameDoctor of Philosophy
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