Dispersing and functionalizing multiwalled carbon nanotubes in TiO2 sol

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Engineering

Background:

• Developing advanced composite materials requires effective dispersion and functionalization of nanomaterials.
• Titanium dioxide (TiO2) sol-gel processes offer a versatile platform for material synthesis.
• Oxidized multiwalled carbon nanotubes (MWCNTs) possess unique properties but face dispersion challenges.

Purpose of the Study:

• To synchronously disperse and functionalize oxidized MWCNTs within a TiO2 sol using an in situ sol-gel process.
• To create novel MWCNT-TiO2 tubular composite structures.
• To characterize the resulting materials and their formation mechanism.

Main Methods:

• In situ sol-gel synthesis of TiO2 incorporating oxidized MWCNTs.
• Characterization using Transmission Electron Microscopy (TEM), X-ray Photoelectron Spectroscopy (XPS), Raman Spectroscopy, and Atomic Force Microscopy (AFM).
• Filtration, washing, annealing, and redispersion experiments to analyze composite formation.

Main Results:

• The hydrolysis and condensation of Ti(OC4H9)4 molecules effectively dispersed MWCNTs in the TiO2 sol.
• A strong interaction between oxidized MWCNTs and the TiO2 sol facilitated the formation of MWCNT (core)-TiOx (shell) tubular composites.
• Discrete nanotubes were observed on silicon surfaces via AFM, confirming successful functionalization and structure formation.

Conclusions:

• The in situ sol-gel process provides an effective method for dispersing and functionalizing oxidized MWCNTs in TiO2.
• This approach enables the fabrication of MWCNT-TiO2 tubular composites and TiO2 nanotubes.
• The developed method offers a pathway for creating advanced nanomaterials with tailored properties.