Single-walled carbon nanotube-based coaxial nanowires: synthesis, characterization, and electrical properties
| Autor: | Zhongfan Liu, Xuetong Zhang, Mengting Wen, Zhou Lü, Jin Zhang, Hailin Liang |
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| Rok vydání: | 2006 |
| Předmět: |
Materials science
Polymers Surface Properties Nanowire Nanotechnology Carbon nanotube law.invention Polyethylene Glycols Surface-Active Agents law Materials Chemistry Pyrroles Physical and Theoretical Chemistry Particle Size Micelles Aniline Compounds Cetrimonium Nanotubes Carbon Nanowires Electric Conductivity Temperature Surfaces Coatings and Films Characterization (materials science) Core (optical fiber) Cetrimonium Compounds Electric properties Coaxial |
| Zdroj: | The journal of physical chemistry. B. 109(3) |
| ISSN: | 1520-6106 |
| Popis: | We report herein the template-directed synthesis, characterization, and electric properties of single-walled carbon nanotube- (SWNT-) based coaxial nanowires, that is, core (SWNT)-shell (conducting polypyrrole and polyaniline) nanowires. The SWNTs were first dispersed in aqueous solutions containing cationic surfactant cetyltrimethylammonium bromide (CTAB) or nonionic surfactant poly(ethylene glycol) mono-p-nonyl phenyl ether (O pi-10). Each individual nanotube (or small bundle) was then encased in its own micellelike envelope with hydrophobic surfactant groups orientated toward the nanotube and hydrophilic groups orientated toward the solution. And thus a hydrophobic region within the micelle/SWNT (called a micelle/SWNT hybrid template) was formed. Insertion and growth of pyrrole or aniline monomers in this hybrid template, upon removal of the surfactant, produce coaxial structures with a SWNT center and conducting polypyrrole or polyaniline coating. Raman and Fourier transform infrared (FTIR) spectroscopy and scanning (SEM) and transmission (TEM) electron microscopy were used to characterize the composition and the structures of these coaxial nanowires. The results revealed that the micellar molecules used could affect the surface morphologies of the resulting coaxial nanowires but not the molecular structures of the corresponding conducting polymers. Electric properties testing indicated that the SWNTs played the key roles in the conducting polymer/SWNT composites during electron transfer in the temperature range 77 K to room temperature. Compared with the SWNT network embedded in the conducting polymers, the composites within which SWNTs were coated perfectly by the identical conducting polymers exhibited higher barrier heights during electron transfer. |
| Databáze: | OpenAIRE |
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