التفاصيل البيبلوغرافية
| العنوان: |
Controlled synthesis and tunable properties of mesoporous semiconducting carbon nanotubes |
| المؤلفون: |
Geru, I.I., Жеру, И., Tarabukin, A.B., Ignat, M., Popovici, E. |
| المصدر: |
Materials Science and Condensed Matter Physics (Editia 6) |
| سنة النشر: |
2012 |
| الوصف: |
Mesoporous carbon nanotubes CNTs were prepared by a simple nanocasting route, implying SBA-15 as template and glycerol as carbon source. The silica template, SBA-15, was synthesized using a tri-block copolymer Pluronic P123 by a hydrothermal method during three days. SBA-15 was synthesized using the tri-block copolymer polyethylene glycol-block-polypropylene glycolblock-polyethylene glycol Pluronic P123, Molecular weight = 5800, EO20PO70EO20 Aldrich as a structure directing agent according to the method reported in the literature [1]. The structure of the synthesized mesoporous carbon was studied using both low and wide angle XRD. The low angle XRD pattern shows three well resolved peaks 100, 110 and 200 which are characteristic to the two-dimensional hexagonal space group p6mm. As the mesoporous carbon material exhibits these kinds of diffractions, it has an ordered structure retained from the silica template. The low angle XRD pattern allowed calculations of the cell parameter a0 = 9.8 nm and d-spacing d100 = 8.5 nm. The wide angle XRD pattern exhibit two peaks: 002 resulting from stacks of parallel layer planes, and 101 peak that is know to be characteristic to the carbon states described as clusters made of small fragments of graphene planes plus some amount of disorganized carbon. The average pore sizes of the mesoporous carbon samples are ranging from 3 nm to 5 nm. The calculated pore size distribution data showed a pore size distribution centered at 3.8 nm. The Raman spectrum shows a strong vibration at 1599 cm-1 the G-band that characterizes the E2g mode, which is due to the vibration corresponding to the movement in opposite directions of two neighboring sp2-bonded carbon atoms in a two-dimensional hexagonal lattice. The presence of the G-band suggests that well defined graphitic domains are indeed developed. Another band, centered appreciatively at 1342 cm-1 the D-band, which results from the defects within the graphite layers, suggests the existence of the disordered graphitized domains. The SEM ... |
| نوع الوثيقة: |
article in journal/newspaper |
| وصف الملف: |
application/pdf |
| اللغة: |
English |
| Relation: |
https://ibn.idsi.md/vizualizare_articol/98871 |
| الاتاحة: |
https://ibn.idsi.md/vizualizare_articol/98871 |
| Rights: |
info:eu-repo/semantics/openAccess |
| رقم الانضمام: |
edsbas.39889822 |
| قاعدة البيانات: |
BASE |