Formation of stable Si–O–C submonolayers on hydrogen-terminated silicon(111) under low-temperature conditions
In this letter, we report results of a hydrosilylation carried out on bifunctional molecules by using two different approaches, namely through thermal treatment and photochemical treatment through UV irradiation. Previously, our group also demonstrated that in a mixed alkyne/alcohol solution, surfac...
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| Format: | Article |
| Language: | English |
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Beilstein-Institut
2015-01-01
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| Series: | Beilstein Journal of Nanotechnology |
| Subjects: | |
| Online Access: | https://doi.org/10.3762/bjnano.6.3 |
| _version_ | 1819260057605373952 |
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| author | Yit Lung Khung Siti Hawa Ngalim Andrea Scaccabarozzi Dario Narducci |
| author_facet | Yit Lung Khung Siti Hawa Ngalim Andrea Scaccabarozzi Dario Narducci |
| author_sort | Yit Lung Khung |
| collection | DOAJ |
| description | In this letter, we report results of a hydrosilylation carried out on bifunctional molecules by using two different approaches, namely through thermal treatment and photochemical treatment through UV irradiation. Previously, our group also demonstrated that in a mixed alkyne/alcohol solution, surface coupling is biased towards the formation of Si–O–C linkages instead of Si–C linkages, thus indirectly supporting the kinetic model of hydrogen abstraction from the Si–H surface (Khung, Y. L. et al. Chem. – Eur. J. 2014, 20, 15151–15158). To further examine the probability of this kinetic model we compare the results from reactions with bifunctional alkynes carried out under thermal treatment (<130 °C) and under UV irradiation, respectively. X-ray photoelectron spectroscopy and contact angle measurements showed that under thermal conditions, the Si–H surface predominately reacts to form Si–O–C bonds from ethynylbenzyl alcohol solution while the UV photochemical route ensures that the alcohol-based alkyne may also form Si–C bonds, thus producing a monolayer of mixed linkages. The results suggested the importance of surface radicals as well as the type of terminal group as being essential towards directing the nature of surface linkage. |
| first_indexed | 2024-12-23T19:19:51Z |
| format | Article |
| id | doaj.art-7f01fde4ee29430f9c77537dcbb2e0a5 |
| institution | Directory Open Access Journal |
| issn | 2190-4286 |
| language | English |
| last_indexed | 2024-12-23T19:19:51Z |
| publishDate | 2015-01-01 |
| publisher | Beilstein-Institut |
| record_format | Article |
| series | Beilstein Journal of Nanotechnology |
| spelling | doaj.art-7f01fde4ee29430f9c77537dcbb2e0a52022-12-21T17:34:12ZengBeilstein-InstitutBeilstein Journal of Nanotechnology2190-42862015-01-0161192610.3762/bjnano.6.32190-4286-6-3Formation of stable Si–O–C submonolayers on hydrogen-terminated silicon(111) under low-temperature conditionsYit Lung Khung0Siti Hawa Ngalim1Andrea Scaccabarozzi2Dario Narducci3University of Milan-Bicocca, Department of Materials Science, Via R. Cozzi 53, I-20125 Milan, ItalyRegenerative Medicine Cluster, Advanced Medical and Dental Institute (AMDI), Universiti Sains Malaysia, Penang, MalaysiaUniversity of Milan-Bicocca, Department of Materials Science, Via R. Cozzi 53, I-20125 Milan, ItalyUniversity of Milan-Bicocca, Department of Materials Science, Via R. Cozzi 53, I-20125 Milan, ItalyIn this letter, we report results of a hydrosilylation carried out on bifunctional molecules by using two different approaches, namely through thermal treatment and photochemical treatment through UV irradiation. Previously, our group also demonstrated that in a mixed alkyne/alcohol solution, surface coupling is biased towards the formation of Si–O–C linkages instead of Si–C linkages, thus indirectly supporting the kinetic model of hydrogen abstraction from the Si–H surface (Khung, Y. L. et al. Chem. – Eur. J. 2014, 20, 15151–15158). To further examine the probability of this kinetic model we compare the results from reactions with bifunctional alkynes carried out under thermal treatment (<130 °C) and under UV irradiation, respectively. X-ray photoelectron spectroscopy and contact angle measurements showed that under thermal conditions, the Si–H surface predominately reacts to form Si–O–C bonds from ethynylbenzyl alcohol solution while the UV photochemical route ensures that the alcohol-based alkyne may also form Si–C bonds, thus producing a monolayer of mixed linkages. The results suggested the importance of surface radicals as well as the type of terminal group as being essential towards directing the nature of surface linkage.https://doi.org/10.3762/bjnano.6.3hydrogen abstractionthermal hydrosilylationUV-initated hydrosilylationX-ray photoelectron spectroscopy |
| spellingShingle | Yit Lung Khung Siti Hawa Ngalim Andrea Scaccabarozzi Dario Narducci Formation of stable Si–O–C submonolayers on hydrogen-terminated silicon(111) under low-temperature conditions Beilstein Journal of Nanotechnology hydrogen abstraction thermal hydrosilylation UV-initated hydrosilylation X-ray photoelectron spectroscopy |
| title | Formation of stable Si–O–C submonolayers on hydrogen-terminated silicon(111) under low-temperature conditions |
| title_full | Formation of stable Si–O–C submonolayers on hydrogen-terminated silicon(111) under low-temperature conditions |
| title_fullStr | Formation of stable Si–O–C submonolayers on hydrogen-terminated silicon(111) under low-temperature conditions |
| title_full_unstemmed | Formation of stable Si–O–C submonolayers on hydrogen-terminated silicon(111) under low-temperature conditions |
| title_short | Formation of stable Si–O–C submonolayers on hydrogen-terminated silicon(111) under low-temperature conditions |
| title_sort | formation of stable si o c submonolayers on hydrogen terminated silicon 111 under low temperature conditions |
| topic | hydrogen abstraction thermal hydrosilylation UV-initated hydrosilylation X-ray photoelectron spectroscopy |
| url | https://doi.org/10.3762/bjnano.6.3 |
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