Effects of TEOS Precursor and Reaction Time on the Synthesis of Silica Coated Single-Walled Carbon Nanotubes

Wanchart Suprompituk; Thana Radpakdee; Nantiwat Pholdee; Papot Jaroenapibal

doi:10.4028/www.scientific.net/MSF.872.248

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Effects of TEOS Precursor and Reaction Time on the Synthesis of Silica Coated Single-Walled Carbon Nanotubes
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HomeMaterials Science ForumMaterials Science Forum Vol. 872Effects of TEOS Precursor and Reaction Time on the...

Effects of TEOS Precursor and Reaction Time on the Synthesis of Silica Coated Single-Walled Carbon Nanotubes

Abstract:

This paper demonstrates a technique to synthesize silica-coated single-walled carbon nanotubes (SWNTs@SiO₂) based on sodium dodecyl sulfate (SDS), 3-aminopropyltriethoxysilane (APTES), ammonium hydroxide (NH₄OH) and tetraethyl orthosilicate (TEOS). The coating of silica is done to promote bond strength between SWNTs@SiO₂ and other materials. The anionic surfactant used in the coating process helps create linkages between the silica coupling agent and the SWNTs’ walls without compromising the excellent properties of SWNTs. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy dispersive x-ray spectroscopy (EDX) were employed to characterize the sizes of SiO₂ particles, the structure of SWNTs@SiO₂, and the elements existed in the materials. The size of SiO₂ particles has shown to be dependent on the amount of TEOS concentration and reaction time. Higher TEOS concentration and longer reaction time led to larger SiO₂ particles. Successful coatings of SiO₂ on SWNTs have been demonstrated. Silica appeared to be uniformly coated on the SWNTs surfaces. The thickness of the coating layer was found to be approximately 3-7 nm.

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Material and Manufacturing Technology VII

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Materials Science Forum (Volume 872)

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248-252

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https://doi.org/10.4028/www.scientific.net/MSF.872.248

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September 2016

Authors:

Wanchart Suprompituk, Thana Radpakdee, Nantiwat Pholdee, Papot Jaroenapibal

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Anionic Surfactant, Carbon Nanotubes, Composite, Silica Coating

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