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Solid state NMR study of nanodiamond surface chemistry.
Marc Dubois1, Katia Guérin, Nicolas Batisse
1Clermont Université, UBP, Laboratoire des Matériaux Inorganiques (UMR CNRS 6002), 24, Avenue des Landais, 63177 Aubière, France. marc.dubois@univ-bpclermont.fr
Solid State Nuclear Magnetic Resonance
|November 29, 2011
Summary
This study investigates nanodiamond surface chemistry using solid-state NMR. Fluorination converts surface hydroxyl groups to C-F bonds, altering hydrophobicity and purifying the material.
Area of Science:
- Materials Science
- Nanotechnology
- Solid-State Chemistry
Background:
- Nanodiamonds possess unique surface chemistry critical for their applications.
- Understanding the distribution and nature of surface functional groups is essential for material modification.
Purpose of the Study:
- To investigate the surface chemistry of nanodiamonds synthesized via different methods.
- To characterize the effects of chemical purification and fluorination on nanodiamonds.
Main Methods:
- Solid-state Nuclear Magnetic Resonance (NMR) spectroscopy using Carbon-13 (13C), Proton-1H, and Fluorine-19 (19F) nuclei.
- Magic Angle Spinning (MAS) and Cross-Polarization Magic Angle Spinning (CP-MAS) techniques.
- Physicochemical characterization including spin-lattice relaxation times (T1), spin densities, specific surface area, Raman, and Infrared spectroscopy.
Main Results:
- Identified surface functional groups including hydroxyl (C-OH), hydrogen (C-H), and fluorine (C-F) groups.
- Determined that C-OH groups are exclusively surface-bound, while C-H and dangling bonds are distributed throughout the nanodiamond volume.
- Demonstrated that fluorination effectively converts surface C-OH groups into covalent C-F bonds, leading to purification and increased hydrophobicity.
Conclusions:
- Solid-state NMR is a powerful tool for elucidating nanodiamond surface and bulk properties.
- Chemical modification, specifically fluorination, can precisely tune nanodiamond surface characteristics for targeted applications.
