Dominant Polar Surfaces of Colloidal II-VI Wurtzite Semiconductor Nanocrystals Enabled by Cation Exchange
Polar surfaces of ionic crystals are of growing technological importance, with implications for the efficiency of photocatalysts, gas sensors, and electronic devices. The creation of ionic nanocrystals with high percentages of polar surfaces is an option for improving their efficiency in the aforeme...
| Main Authors: | , , , , , , , , , , , |
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| Format: | Journal Article |
| Language: | English |
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AMER CHEMICAL SOC
2020
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| Subjects: | |
| Online Access: | http://purl.org/au-research/grants/arc/DE160100589 http://hdl.handle.net/20.500.11937/90989 |
| _version_ | 1848765479178469376 |
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| author | Wang, A. Wang, W. Chen, Jiayi Mao, Rundong Pang, Yingping Li, Y. Chen, Wei Chen, Dechao Hao, D. Ni, B.J. Saunders, M. Jia, Guohua |
| author_facet | Wang, A. Wang, W. Chen, Jiayi Mao, Rundong Pang, Yingping Li, Y. Chen, Wei Chen, Dechao Hao, D. Ni, B.J. Saunders, M. Jia, Guohua |
| author_sort | Wang, A. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Polar surfaces of ionic crystals are of growing technological importance, with implications for the efficiency of photocatalysts, gas sensors, and electronic devices. The creation of ionic nanocrystals with high percentages of polar surfaces is an option for improving their efficiency in the aforementioned applications but is hard to accomplish because they are less thermodynamically stable and prone to vanish during the growth process. Herein, we develop a strategy that is capable of producing polar surface-dominated II-VI semiconductor nanocrystals, including ZnS and CdS, from copper sulfide hexagonal nanoplates through cation exchange reactions. The obtained wurtzite ZnS hexagonal nanoplates have dominant {002} polar surfaces, occupying up to 97.8% of all surfaces. Density functional theory calculations reveal the polar surfaces can be stabilized by a charge transfer of 0.25 eV/formula from the anion-terminated surface to the cation-terminated surface, which also explains the presence of polar surfaces in the initial Cu1.75S hexagonal nanoplates with cation deficiency prior to cation exchange reactions. Experimental results showed that the HER activity could be boosted by the surface polarization of polar surface-dominated ZnS hexagonal nanoplates. We anticipate this strategy is general and could be used with other systems to prepare nanocrystals with dominant polar surfaces. Furthermore, the availability of colloidal semiconductor nanocrystals with dominant polar surfaces produced through this strategy opens a new avenue for improving their efficiency in catalysis, photocatalysis, gas sensing, and other applications. |
| first_indexed | 2025-11-14T11:35:54Z |
| format | Journal Article |
| id | curtin-20.500.11937-90989 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:35:54Z |
| publishDate | 2020 |
| publisher | AMER CHEMICAL SOC |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-909892023-05-15T02:22:29Z Dominant Polar Surfaces of Colloidal II-VI Wurtzite Semiconductor Nanocrystals Enabled by Cation Exchange Wang, A. Wang, W. Chen, Jiayi Mao, Rundong Pang, Yingping Li, Y. Chen, Wei Chen, Dechao Hao, D. Ni, B.J. Saunders, M. Jia, Guohua Science & Technology Physical Sciences Technology Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Atomic, Molecular & Chemical Chemistry Science & Technology - Other Topics Materials Science Physics TIO2 SINGLE-CRYSTALS CDSE NANOCRYSTALS Polar surfaces of ionic crystals are of growing technological importance, with implications for the efficiency of photocatalysts, gas sensors, and electronic devices. The creation of ionic nanocrystals with high percentages of polar surfaces is an option for improving their efficiency in the aforementioned applications but is hard to accomplish because they are less thermodynamically stable and prone to vanish during the growth process. Herein, we develop a strategy that is capable of producing polar surface-dominated II-VI semiconductor nanocrystals, including ZnS and CdS, from copper sulfide hexagonal nanoplates through cation exchange reactions. The obtained wurtzite ZnS hexagonal nanoplates have dominant {002} polar surfaces, occupying up to 97.8% of all surfaces. Density functional theory calculations reveal the polar surfaces can be stabilized by a charge transfer of 0.25 eV/formula from the anion-terminated surface to the cation-terminated surface, which also explains the presence of polar surfaces in the initial Cu1.75S hexagonal nanoplates with cation deficiency prior to cation exchange reactions. Experimental results showed that the HER activity could be boosted by the surface polarization of polar surface-dominated ZnS hexagonal nanoplates. We anticipate this strategy is general and could be used with other systems to prepare nanocrystals with dominant polar surfaces. Furthermore, the availability of colloidal semiconductor nanocrystals with dominant polar surfaces produced through this strategy opens a new avenue for improving their efficiency in catalysis, photocatalysis, gas sensing, and other applications. 2020 Journal Article http://hdl.handle.net/20.500.11937/90989 10.1021/acs.jpclett.0c01372 English http://purl.org/au-research/grants/arc/DE160100589 AMER CHEMICAL SOC fulltext |
| spellingShingle | Science & Technology Physical Sciences Technology Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Atomic, Molecular & Chemical Chemistry Science & Technology - Other Topics Materials Science Physics TIO2 SINGLE-CRYSTALS CDSE NANOCRYSTALS Wang, A. Wang, W. Chen, Jiayi Mao, Rundong Pang, Yingping Li, Y. Chen, Wei Chen, Dechao Hao, D. Ni, B.J. Saunders, M. Jia, Guohua Dominant Polar Surfaces of Colloidal II-VI Wurtzite Semiconductor Nanocrystals Enabled by Cation Exchange |
| title | Dominant Polar Surfaces of Colloidal II-VI Wurtzite Semiconductor Nanocrystals Enabled by Cation Exchange |
| title_full | Dominant Polar Surfaces of Colloidal II-VI Wurtzite Semiconductor Nanocrystals Enabled by Cation Exchange |
| title_fullStr | Dominant Polar Surfaces of Colloidal II-VI Wurtzite Semiconductor Nanocrystals Enabled by Cation Exchange |
| title_full_unstemmed | Dominant Polar Surfaces of Colloidal II-VI Wurtzite Semiconductor Nanocrystals Enabled by Cation Exchange |
| title_short | Dominant Polar Surfaces of Colloidal II-VI Wurtzite Semiconductor Nanocrystals Enabled by Cation Exchange |
| title_sort | dominant polar surfaces of colloidal ii-vi wurtzite semiconductor nanocrystals enabled by cation exchange |
| topic | Science & Technology Physical Sciences Technology Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Atomic, Molecular & Chemical Chemistry Science & Technology - Other Topics Materials Science Physics TIO2 SINGLE-CRYSTALS CDSE NANOCRYSTALS |
| url | http://purl.org/au-research/grants/arc/DE160100589 http://hdl.handle.net/20.500.11937/90989 |