Branch number matters: Promoting catalytic reduction of 4-nitrophenol over gold nanostars by raising the number of branches and coating with mesoporous SiO2
© 2016 Elsevier Inc. In this study, we demonstrate for the first time that highly branched gold nanostars (AuNSs) and silica-coated AuNSs (AuNSs@mSiO2) could potentially serve as efficient hydrogenation catalysts. The catalytic activity could be promoted by raising the number of tipped-branches of A...
| Main Authors: | , , , , , |
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| Format: | Journal Article |
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Academic Press
2016
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| Online Access: | http://hdl.handle.net/20.500.11937/8924 |
| _version_ | 1848745801187065856 |
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| author | Ndokoye, P. Zhao, Q. Li, Xin Yong Li, T. Tade, Moses Wang, Shaobin |
| author_facet | Ndokoye, P. Zhao, Q. Li, Xin Yong Li, T. Tade, Moses Wang, Shaobin |
| author_sort | Ndokoye, P. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | © 2016 Elsevier Inc. In this study, we demonstrate for the first time that highly branched gold nanostars (AuNSs) and silica-coated AuNSs (AuNSs@mSiO2) could potentially serve as efficient hydrogenation catalysts. The catalytic activity could be promoted by raising the number of tipped-branches of AuNSs, which reveals that the tips play an important role as active sites. The fabricated sharply-pointed AuNSs benefit the electron transfer from BH4 anions to 4-nitrophenol. Coating AuNSs with mesoporous silica (AuNSs@mSiO2) further enhanced the reduction rate and recyclability, and also contributed to reducing the induction period. The AuNSs@mSiO2 (50-100 nm in diameter) are large enough to be catalytically inactive, but they consist of sharply-pointed tips with the radius of 2.6-3.6 nm, which are rich in coordinately unsaturated sites similar to those of nanoparticles and clusters. Such features in structure and activity would also extend their application range in heterogeneous catalysis. |
| first_indexed | 2025-11-14T06:23:08Z |
| format | Journal Article |
| id | curtin-20.500.11937-8924 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T06:23:08Z |
| publishDate | 2016 |
| publisher | Academic Press |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-89242017-09-13T14:33:46Z Branch number matters: Promoting catalytic reduction of 4-nitrophenol over gold nanostars by raising the number of branches and coating with mesoporous SiO2 Ndokoye, P. Zhao, Q. Li, Xin Yong Li, T. Tade, Moses Wang, Shaobin © 2016 Elsevier Inc. In this study, we demonstrate for the first time that highly branched gold nanostars (AuNSs) and silica-coated AuNSs (AuNSs@mSiO2) could potentially serve as efficient hydrogenation catalysts. The catalytic activity could be promoted by raising the number of tipped-branches of AuNSs, which reveals that the tips play an important role as active sites. The fabricated sharply-pointed AuNSs benefit the electron transfer from BH4 anions to 4-nitrophenol. Coating AuNSs with mesoporous silica (AuNSs@mSiO2) further enhanced the reduction rate and recyclability, and also contributed to reducing the induction period. The AuNSs@mSiO2 (50-100 nm in diameter) are large enough to be catalytically inactive, but they consist of sharply-pointed tips with the radius of 2.6-3.6 nm, which are rich in coordinately unsaturated sites similar to those of nanoparticles and clusters. Such features in structure and activity would also extend their application range in heterogeneous catalysis. 2016 Journal Article http://hdl.handle.net/20.500.11937/8924 10.1016/j.jcis.2015.11.032 Academic Press restricted |
| spellingShingle | Ndokoye, P. Zhao, Q. Li, Xin Yong Li, T. Tade, Moses Wang, Shaobin Branch number matters: Promoting catalytic reduction of 4-nitrophenol over gold nanostars by raising the number of branches and coating with mesoporous SiO2 |
| title | Branch number matters: Promoting catalytic reduction of 4-nitrophenol over gold nanostars by raising the number of branches and coating with mesoporous SiO2 |
| title_full | Branch number matters: Promoting catalytic reduction of 4-nitrophenol over gold nanostars by raising the number of branches and coating with mesoporous SiO2 |
| title_fullStr | Branch number matters: Promoting catalytic reduction of 4-nitrophenol over gold nanostars by raising the number of branches and coating with mesoporous SiO2 |
| title_full_unstemmed | Branch number matters: Promoting catalytic reduction of 4-nitrophenol over gold nanostars by raising the number of branches and coating with mesoporous SiO2 |
| title_short | Branch number matters: Promoting catalytic reduction of 4-nitrophenol over gold nanostars by raising the number of branches and coating with mesoporous SiO2 |
| title_sort | branch number matters: promoting catalytic reduction of 4-nitrophenol over gold nanostars by raising the number of branches and coating with mesoporous sio2 |
| url | http://hdl.handle.net/20.500.11937/8924 |