In-situ transmission electron microscopy investigation on the evolution of Pt nanocrystals in atmosphere
Metal nanocrystals exhibit unique properties due to their high surface-to-volume ratio and have great potential for applications in the fields of electronics, magnetics, optics and catalysis. However, their high specific surface area leads to easy coarsening in operation, which may greatly degrade t...
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| Format: | Article |
| Language: | English |
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OOO "CNT «NanoStroitelstvo»
2022-06-01
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| Series: | Нанотехнологии в строительстве |
| Subjects: | |
| Online Access: | http://nanobuild.ru/en_EN/journal/Nanobuild-3-2022/198-204.pdf |
| _version_ | 1811329176071831552 |
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| author | Qinglin Liu Huanyu Ye Zhihong Zhang Rongming Wang |
| author_facet | Qinglin Liu Huanyu Ye Zhihong Zhang Rongming Wang |
| author_sort | Qinglin Liu |
| collection | DOAJ |
| description | Metal nanocrystals exhibit unique properties due to their high surface-to-volume ratio and have great potential for applications in the fields of electronics, magnetics, optics and catalysis. However, their high specific surface area leads to easy coarsening in operation, which may greatly degrade their performances, especially when they are exposed to various chemical environments or at high temperatures. Therefore, the direct visualization of nanocrystals' structural evolution when they are coarsening is crucial to gain insight into the mechanism and develop more effective means to improve the size stability of nanocrystals. In this work, we investigated the structural evolution of Pt nanocrystals with sizes of ~ 4 nm on SiNx film in both oxidizing and reducing atmospheres at a moderate temperature (300оС) in the aberration-corrected environmental transmission electron microscopy (ETEM).
The sizes of nanocrystals remain almost unchanged when annealed in the oxygen atmosphere with volatile PtOx formation on the surface, hindering nanocrystals sintering and leading to Pt loss. On the other hand, obvious coarsening of nanocrystals resulting from Ostwald-ripening and nanocrystal migration and coalescence was observed in the reducing atmosphere. Our findings reveal the dynamic structural evolution of nanocrystals in different atmospheres and provide possible ways to improve the size stability of nanocrystals. |
| first_indexed | 2024-04-13T15:39:11Z |
| format | Article |
| id | doaj.art-b93f35870a054d2aa73c145031a24a5c |
| institution | Directory Open Access Journal |
| issn | 2075-8545 |
| language | English |
| last_indexed | 2024-04-13T15:39:11Z |
| publishDate | 2022-06-01 |
| publisher | OOO "CNT «NanoStroitelstvo» |
| record_format | Article |
| series | Нанотехнологии в строительстве |
| spelling | doaj.art-b93f35870a054d2aa73c145031a24a5c2022-12-22T02:41:12ZengOOO "CNT «NanoStroitelstvo»Нанотехнологии в строительстве2075-85452022-06-0114319820410.15828/2075-8545-2022-14-3-198-204In-situ transmission electron microscopy investigation on the evolution of Pt nanocrystals in atmosphereQinglin Liu0Huanyu Ye1Zhihong Zhang2Rongming Wang3University of Science and Technology Beijing, Beijing 100083, ChinaUniversity of Science and Technology Beijing, Beijing 100083, ChinaUniversity of Science and Technology Beijing, Beijing 100083, ChinaUniversity of Science and Technology Beijing, Beijing 100083, ChinaMetal nanocrystals exhibit unique properties due to their high surface-to-volume ratio and have great potential for applications in the fields of electronics, magnetics, optics and catalysis. However, their high specific surface area leads to easy coarsening in operation, which may greatly degrade their performances, especially when they are exposed to various chemical environments or at high temperatures. Therefore, the direct visualization of nanocrystals' structural evolution when they are coarsening is crucial to gain insight into the mechanism and develop more effective means to improve the size stability of nanocrystals. In this work, we investigated the structural evolution of Pt nanocrystals with sizes of ~ 4 nm on SiNx film in both oxidizing and reducing atmospheres at a moderate temperature (300оС) in the aberration-corrected environmental transmission electron microscopy (ETEM). The sizes of nanocrystals remain almost unchanged when annealed in the oxygen atmosphere with volatile PtOx formation on the surface, hindering nanocrystals sintering and leading to Pt loss. On the other hand, obvious coarsening of nanocrystals resulting from Ostwald-ripening and nanocrystal migration and coalescence was observed in the reducing atmosphere. Our findings reveal the dynamic structural evolution of nanocrystals in different atmospheres and provide possible ways to improve the size stability of nanocrystals.http://nanobuild.ru/en_EN/journal/Nanobuild-3-2022/198-204.pdfnanocrystalin-situ transmission electron microscopy (tem)structural evolutionsize stabilityatmosphere. |
| spellingShingle | Qinglin Liu Huanyu Ye Zhihong Zhang Rongming Wang In-situ transmission electron microscopy investigation on the evolution of Pt nanocrystals in atmosphere Нанотехнологии в строительстве nanocrystal in-situ transmission electron microscopy (tem) structural evolution size stability atmosphere. |
| title | In-situ transmission electron microscopy investigation on the evolution of Pt nanocrystals in atmosphere |
| title_full | In-situ transmission electron microscopy investigation on the evolution of Pt nanocrystals in atmosphere |
| title_fullStr | In-situ transmission electron microscopy investigation on the evolution of Pt nanocrystals in atmosphere |
| title_full_unstemmed | In-situ transmission electron microscopy investigation on the evolution of Pt nanocrystals in atmosphere |
| title_short | In-situ transmission electron microscopy investigation on the evolution of Pt nanocrystals in atmosphere |
| title_sort | in situ transmission electron microscopy investigation on the evolution of pt nanocrystals in atmosphere |
| topic | nanocrystal in-situ transmission electron microscopy (tem) structural evolution size stability atmosphere. |
| url | http://nanobuild.ru/en_EN/journal/Nanobuild-3-2022/198-204.pdf |
| work_keys_str_mv | AT qinglinliu insitutransmissionelectronmicroscopyinvestigationontheevolutionofptnanocrystalsinatmosphere AT huanyuye insitutransmissionelectronmicroscopyinvestigationontheevolutionofptnanocrystalsinatmosphere AT zhihongzhang insitutransmissionelectronmicroscopyinvestigationontheevolutionofptnanocrystalsinatmosphere AT rongmingwang insitutransmissionelectronmicroscopyinvestigationontheevolutionofptnanocrystalsinatmosphere |