Self-Assembled 3D ZnO Porous Structures with Exposed Reactive {0001} Facets and Their Enhanced Gas Sensitivity
Complex three-dimensional structures comprised of porous ZnO plates were synthesized in a controlled fashion by hydrothermal methods. Through subtle changes to reaction conditions, the ZnO structures could be self-assembled from 20 nm thick nanosheets into grass-like and flower-like structures which...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2013-07-01
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| Series: | Sensors |
| Subjects: | |
| Online Access: | http://www.mdpi.com/1424-8220/13/7/8445 |
| _version_ | 1811280716661522432 |
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| author | Eric R. Waclawik Wojtek Wlodarski Muhammad Z. Ahmad Jin Chang |
| author_facet | Eric R. Waclawik Wojtek Wlodarski Muhammad Z. Ahmad Jin Chang |
| author_sort | Eric R. Waclawik |
| collection | DOAJ |
| description | Complex three-dimensional structures comprised of porous ZnO plates were synthesized in a controlled fashion by hydrothermal methods. Through subtle changes to reaction conditions, the ZnO structures could be self-assembled from 20 nm thick nanosheets into grass-like and flower-like structures which led to the exposure of high proportions of ZnO {0001} crystal facets for both these materials. The measured surface area of the flower-like and the grass, or platelet-like ZnO samples were 72.8 and 52.4 m2∙g−1, respectively. Gas sensing results demonstrated that the porous, flower-like ZnO structures exhibited enhanced sensing performance towards NO2 gas compared with either grass-like ZnO or commercially sourced ZnO nanoparticle samples. The porous, flower-like ZnO structures provided a high surface area which enhanced the ZnO gas sensor response. X-ray photoelectron spectroscopy characterization revealed that flower-like ZnO samples possessed a higher percentage of oxygen vacancies than the other ZnO sample-types, which also contributed to their excellent gas sensing performance. |
| first_indexed | 2024-04-13T01:19:46Z |
| format | Article |
| id | doaj.art-38e8f05571c2468fa377554c20c572fe |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-04-13T01:19:46Z |
| publishDate | 2013-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-38e8f05571c2468fa377554c20c572fe2022-12-22T03:08:48ZengMDPI AGSensors1424-82202013-07-011378445846010.3390/s130708445Self-Assembled 3D ZnO Porous Structures with Exposed Reactive {0001} Facets and Their Enhanced Gas SensitivityEric R. WaclawikWojtek WlodarskiMuhammad Z. AhmadJin ChangComplex three-dimensional structures comprised of porous ZnO plates were synthesized in a controlled fashion by hydrothermal methods. Through subtle changes to reaction conditions, the ZnO structures could be self-assembled from 20 nm thick nanosheets into grass-like and flower-like structures which led to the exposure of high proportions of ZnO {0001} crystal facets for both these materials. The measured surface area of the flower-like and the grass, or platelet-like ZnO samples were 72.8 and 52.4 m2∙g−1, respectively. Gas sensing results demonstrated that the porous, flower-like ZnO structures exhibited enhanced sensing performance towards NO2 gas compared with either grass-like ZnO or commercially sourced ZnO nanoparticle samples. The porous, flower-like ZnO structures provided a high surface area which enhanced the ZnO gas sensor response. X-ray photoelectron spectroscopy characterization revealed that flower-like ZnO samples possessed a higher percentage of oxygen vacancies than the other ZnO sample-types, which also contributed to their excellent gas sensing performance.http://www.mdpi.com/1424-8220/13/7/8445zinc oxidegas sensorsself-assemblyporous structure |
| spellingShingle | Eric R. Waclawik Wojtek Wlodarski Muhammad Z. Ahmad Jin Chang Self-Assembled 3D ZnO Porous Structures with Exposed Reactive {0001} Facets and Their Enhanced Gas Sensitivity Sensors zinc oxide gas sensors self-assembly porous structure |
| title | Self-Assembled 3D ZnO Porous Structures with Exposed Reactive {0001} Facets and Their Enhanced Gas Sensitivity |
| title_full | Self-Assembled 3D ZnO Porous Structures with Exposed Reactive {0001} Facets and Their Enhanced Gas Sensitivity |
| title_fullStr | Self-Assembled 3D ZnO Porous Structures with Exposed Reactive {0001} Facets and Their Enhanced Gas Sensitivity |
| title_full_unstemmed | Self-Assembled 3D ZnO Porous Structures with Exposed Reactive {0001} Facets and Their Enhanced Gas Sensitivity |
| title_short | Self-Assembled 3D ZnO Porous Structures with Exposed Reactive {0001} Facets and Their Enhanced Gas Sensitivity |
| title_sort | self assembled 3d zno porous structures with exposed reactive 0001 facets and their enhanced gas sensitivity |
| topic | zinc oxide gas sensors self-assembly porous structure |
| url | http://www.mdpi.com/1424-8220/13/7/8445 |
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