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Surface functionalization of ordered mesoporous carbons--a comparative study.

Zuojiang Li1, Wenfu Yan, Sheng Dai

  • 1Chemical Sciences Division, Oak Ridge National Laboratory, Tennessee 37831, USA.

Langmuir : the ACS Journal of Surfaces and Colloids
|December 1, 2005
PubMed
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Ordered mesoporous carbons were chemically functionalized, attaching organic molecules to their surfaces. This modification altered pore structure and surface area, yielding carbons with micropores and mixed pore systems.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Ordered mesoporous carbons (OMCs) offer tunable structures for various applications.
  • Chemical functionalization is crucial for tailoring OMC surface properties.
  • Controlled synthesis of OMCs with specific pore architectures is essential.

Purpose of the Study:

  • To synthesize hexagonally and cubically structured mesoporous carbons.
  • To chemically functionalize the surfaces of these ordered carbons with organic molecules.
  • To investigate the impact of functionalization on carbon structure and properties.

Main Methods:

  • Synthesis of mesoporous carbons (C15, CMK-5, C48) using silica templates (SBA-15, MCM-48).
  • In situ generation and reaction of diazonium compounds for surface functionalization.

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  • Characterization using Fourier transform infrared spectroscopy, thermogravimetric analysis, and nitrogen adsorption.

    • Main Results:

    • Covalent attachment of chlorine, ester, and alkyl functional groups confirmed.
    • Significant reduction in BET-specific surface area and pore width, with intact carbon frameworks.
    • Functionalization occurred on external surfaces (C15) and both internal/external surfaces (CMK-5, C48), with varying grafting densities.

    Conclusions:

    • Chemical modification effectively functionalized ordered mesoporous carbons.
    • The process created micropores in C15 and C48, and mixed micropores/mesopores in CMK-5.
    • Grafting density is related to mesopore surface area, with accessibility influencing reaction efficiency.