Separation of metallic and semiconducting single walled carbon nanotubes using aqueous two-phase technique / Malcolm Tang Siong Yii
The presence of metallic single-walled carbon nanotubes (M-SWCNT) in as-prepared single-walled carbon nanotubes (SWCNT) poses a significant hurdle to integrate carbon nanotubes into semiconductor electronics. Here the findings of enriching semiconducting single-walled carbon nanotubes (S-SWCNT) usin...
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| Format: | Thesis |
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2014
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| Online Access: | http://studentsrepo.um.edu.my/4838/ http://studentsrepo.um.edu.my/4838/1/MalcolmTangSiongYii.pdf |
| _version_ | 1848772732330704896 |
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| author | Malcolm Tang , Siong Yii |
| author_facet | Malcolm Tang , Siong Yii |
| author_sort | Malcolm Tang , Siong Yii |
| building | UM Research Repository |
| collection | Online Access |
| description | The presence of metallic single-walled carbon nanotubes (M-SWCNT) in as-prepared single-walled carbon nanotubes (SWCNT) poses a significant hurdle to integrate carbon nanotubes into semiconductor electronics. Here the findings of enriching semiconducting single-walled carbon nanotubes (S-SWCNT) using an aqueous two-phase system (ATPS) is reported. The solution containing as received SWCNT and polyethylene glycol (PEG), dextran, N-methylpyrrolidone (NMP) and water effectively separates into two distinct phases, with S-SWNT dominant in one phase while the M-SWCNT congregates in another phase. The separation process is due to the attraction of amine and S-SWCNT as reported by Chattopadhyay. Micro-Raman spectroscopy and Ultraviolet-Visible spectroscopy results show evidence of the removal of M-SWCNT in one of the phases especially for volume ratio 1:1 experiment. The ratio of M11/S22 in the top phase for VR 1.5 reaches 0.2574 compared to 0.1507 in the bottom phase. This finding presents ATPS as an easy, effective and low-cost purification method of carbon nanotubes. |
| first_indexed | 2025-11-14T13:31:11Z |
| format | Thesis |
| id | um-4838 |
| institution | University Malaya |
| institution_category | Local University |
| last_indexed | 2025-11-14T13:31:11Z |
| publishDate | 2014 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | um-48382015-03-12T06:52:41Z Separation of metallic and semiconducting single walled carbon nanotubes using aqueous two-phase technique / Malcolm Tang Siong Yii Malcolm Tang , Siong Yii Q Science (General) The presence of metallic single-walled carbon nanotubes (M-SWCNT) in as-prepared single-walled carbon nanotubes (SWCNT) poses a significant hurdle to integrate carbon nanotubes into semiconductor electronics. Here the findings of enriching semiconducting single-walled carbon nanotubes (S-SWCNT) using an aqueous two-phase system (ATPS) is reported. The solution containing as received SWCNT and polyethylene glycol (PEG), dextran, N-methylpyrrolidone (NMP) and water effectively separates into two distinct phases, with S-SWNT dominant in one phase while the M-SWCNT congregates in another phase. The separation process is due to the attraction of amine and S-SWCNT as reported by Chattopadhyay. Micro-Raman spectroscopy and Ultraviolet-Visible spectroscopy results show evidence of the removal of M-SWCNT in one of the phases especially for volume ratio 1:1 experiment. The ratio of M11/S22 in the top phase for VR 1.5 reaches 0.2574 compared to 0.1507 in the bottom phase. This finding presents ATPS as an easy, effective and low-cost purification method of carbon nanotubes. 2014 Thesis NonPeerReviewed application/pdf http://studentsrepo.um.edu.my/4838/1/MalcolmTangSiongYii.pdf Malcolm Tang , Siong Yii (2014) Separation of metallic and semiconducting single walled carbon nanotubes using aqueous two-phase technique / Malcolm Tang Siong Yii. Masters thesis, University of Malaya. http://studentsrepo.um.edu.my/4838/ |
| spellingShingle | Q Science (General) Malcolm Tang , Siong Yii Separation of metallic and semiconducting single walled carbon nanotubes using aqueous two-phase technique / Malcolm Tang Siong Yii |
| title | Separation of metallic and semiconducting single walled carbon nanotubes using aqueous two-phase technique / Malcolm Tang Siong Yii
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| title_full | Separation of metallic and semiconducting single walled carbon nanotubes using aqueous two-phase technique / Malcolm Tang Siong Yii
|
| title_fullStr | Separation of metallic and semiconducting single walled carbon nanotubes using aqueous two-phase technique / Malcolm Tang Siong Yii
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| title_full_unstemmed | Separation of metallic and semiconducting single walled carbon nanotubes using aqueous two-phase technique / Malcolm Tang Siong Yii
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| title_short | Separation of metallic and semiconducting single walled carbon nanotubes using aqueous two-phase technique / Malcolm Tang Siong Yii
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| title_sort | separation of metallic and semiconducting single walled carbon nanotubes using aqueous two-phase technique / malcolm tang siong yii |
| topic | Q Science (General) |
| url | http://studentsrepo.um.edu.my/4838/ http://studentsrepo.um.edu.my/4838/1/MalcolmTangSiongYii.pdf |