Defects Promoted Topotactic Transformation from Co(OH)2 Nanodiscs To Co3O4 Nano Octahedra
Topotactic transformation was one of the most frequently related processes in the synthesis process of cobalt oxide nanomaterials. Microstructural evolution studies of this process inform and enable the process of controlling the shape of the final products. One such topotactic transformation was in...
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| Format: | Article |
| Language: | English |
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Kaunas University of Technology
2019-05-01
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| Series: | Medžiagotyra |
| Subjects: | |
| Online Access: | http://matsc.ktu.lt/index.php/MatSc/article/view/22005 |
| _version_ | 1819130089500049408 |
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| author | Fei HUI Chunhui WANG Yanhui CHEN Junfeng ZHOU Pierce MAGUIRE Hongzhou ZHANG |
| author_facet | Fei HUI Chunhui WANG Yanhui CHEN Junfeng ZHOU Pierce MAGUIRE Hongzhou ZHANG |
| author_sort | Fei HUI |
| collection | DOAJ |
| description | Topotactic transformation was one of the most frequently related processes in the synthesis process of cobalt oxide nanomaterials. Microstructural evolution studies of this process inform and enable the process of controlling the shape of the final products. One such topotactic transformation was investigated here, the transition from Co(OH)2 hexagonal nano platelets to Co3O4 octahedra by a hydrothermal method in an ammonia solution. Evolution of phase and microstructure was studied during different stages of the reaction to reveal the criteria which prompt this transformation. A phase transformation from Co(OH)2 to CoOOH and hence to Co3O4 was observed. High resolution transmission electron microscopy and image simulation were utilised to disclose the role of defects in the topotactic transformation. A high density of defects including edge dislocations and displacements was found on the surface of dried Co(OH)2 nano platelets. The coexistence of CoOOH domains embedded in the Co(OH)2 surface indicates the absence of the hydrogen bonds of the starting materials. The breaking of hydrogen bonds leads to bonding variation and the further creation of defects, finally prompting the transformation from Co(OH)2 to CoOOH. The breaking of hexagonally arranged hydrogen bonds creates seeds for the formation of Co3O4.
DOI: http://dx.doi.org/10.5755/j01.ms.25.3.22005 |
| first_indexed | 2024-12-22T08:54:04Z |
| format | Article |
| id | doaj.art-abe0f5c11c1a4da88081fd04c555f12a |
| institution | Directory Open Access Journal |
| issn | 1392-1320 2029-7289 |
| language | English |
| last_indexed | 2024-12-22T08:54:04Z |
| publishDate | 2019-05-01 |
| publisher | Kaunas University of Technology |
| record_format | Article |
| series | Medžiagotyra |
| spelling | doaj.art-abe0f5c11c1a4da88081fd04c555f12a2022-12-21T18:31:53ZengKaunas University of TechnologyMedžiagotyra1392-13202029-72892019-05-0125333533910.5755/j01.ms.25.3.2200522005Defects Promoted Topotactic Transformation from Co(OH)2 Nanodiscs To Co3O4 Nano OctahedraFei HUIChunhui WANGYanhui CHENJunfeng ZHOUPierce MAGUIREHongzhou ZHANGTopotactic transformation was one of the most frequently related processes in the synthesis process of cobalt oxide nanomaterials. Microstructural evolution studies of this process inform and enable the process of controlling the shape of the final products. One such topotactic transformation was investigated here, the transition from Co(OH)2 hexagonal nano platelets to Co3O4 octahedra by a hydrothermal method in an ammonia solution. Evolution of phase and microstructure was studied during different stages of the reaction to reveal the criteria which prompt this transformation. A phase transformation from Co(OH)2 to CoOOH and hence to Co3O4 was observed. High resolution transmission electron microscopy and image simulation were utilised to disclose the role of defects in the topotactic transformation. A high density of defects including edge dislocations and displacements was found on the surface of dried Co(OH)2 nano platelets. The coexistence of CoOOH domains embedded in the Co(OH)2 surface indicates the absence of the hydrogen bonds of the starting materials. The breaking of hydrogen bonds leads to bonding variation and the further creation of defects, finally prompting the transformation from Co(OH)2 to CoOOH. The breaking of hexagonally arranged hydrogen bonds creates seeds for the formation of Co3O4. DOI: http://dx.doi.org/10.5755/j01.ms.25.3.22005http://matsc.ktu.lt/index.php/MatSc/article/view/22005topotactic transformationdefectsCoOOH domainsCo3O4 octahedronsCo(OH)2 platelet |
| spellingShingle | Fei HUI Chunhui WANG Yanhui CHEN Junfeng ZHOU Pierce MAGUIRE Hongzhou ZHANG Defects Promoted Topotactic Transformation from Co(OH)2 Nanodiscs To Co3O4 Nano Octahedra Medžiagotyra topotactic transformation defects CoOOH domains Co3O4 octahedrons Co(OH)2 platelet |
| title | Defects Promoted Topotactic Transformation from Co(OH)2 Nanodiscs To Co3O4 Nano Octahedra |
| title_full | Defects Promoted Topotactic Transformation from Co(OH)2 Nanodiscs To Co3O4 Nano Octahedra |
| title_fullStr | Defects Promoted Topotactic Transformation from Co(OH)2 Nanodiscs To Co3O4 Nano Octahedra |
| title_full_unstemmed | Defects Promoted Topotactic Transformation from Co(OH)2 Nanodiscs To Co3O4 Nano Octahedra |
| title_short | Defects Promoted Topotactic Transformation from Co(OH)2 Nanodiscs To Co3O4 Nano Octahedra |
| title_sort | defects promoted topotactic transformation from co oh 2 nanodiscs to co3o4 nano octahedra |
| topic | topotactic transformation defects CoOOH domains Co3O4 octahedrons Co(OH)2 platelet |
| url | http://matsc.ktu.lt/index.php/MatSc/article/view/22005 |
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