3D TEM study on hollow α-Fe2O3 nanostructures and nanorings
| Autor: | Jia Zhang, Ming Lin, Enyi Ye |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Nanostructure genetic structures technology industry and agriculture Nanoparticle Crystal growth 02 engineering and technology Hematite 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Nanomaterials Chemical engineering Etching (microfabrication) visual_art lcsh:TA401-492 visual_art.visual_art_medium lcsh:Materials of engineering and construction. Mechanics of materials General Materials Science 0210 nano-technology Dissolution Hexagonal bipyramid |
| Zdroj: | Progress in Natural Science: Materials International, Vol 29, Iss 6, Pp 685-689 (2019) |
| ISSN: | 1002-0071 |
| DOI: | 10.1016/j.pnsc.2019.11.006 |
| Popis: | Controlled synthesis of hollow structures with non-spherical holes is significant in fabricating nanomaterials with well-defined geometries and specific catalytic and electrochemical properties. Here we report the synthesis of uniform hexagonal bipyramid hematite (α-Fe2O3) nanoparticles with hollow and faceted interior via directional etching process in solution. The delicate hollow structures were investigated by electron tomography and growth mechanism was revealed unambiguously. The three-dimensional visualization demonstrates the outside surfaces of hematite particles are enclosed by six {104} and twelve {113} planes, due to the stabilizing effect of the F− anions on the exposed surfaces. The concurrent etching process is a reverse process of crystal growth and leads to the dissolution occurring at the edges and tips of the hexagonal bipyramid particles, resulting in the perforated crystals with exposed {102} internal facets or overetched nanorings with hexagonal cross-sections. This nanoscale growth and etching process still strictly follows the bulk crystal growth mechanism, thus shedding light on the synthesis of other nanoparticle with controlled morphologies and porous structures. Keywords: Tomography, Hexagonal bipyramid, Dissolution, Facet control, Phase transformation |
| Databáze: | OpenAIRE |
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