Recent developments in MAS DNP-NMR of materials

Area of Science:

• Materials Science
• Spectroscopy
• Physical Chemistry

Background:

• Solid-state NMR spectroscopy is crucial for atomic-level material characterization.
• Sensitivity limitations hinder the study of surfaces, defects, and insensitive isotopes.
• Dynamic Nuclear Polarization (DNP) offers a substantial sensitivity enhancement for NMR.

Purpose of the Study:

• To provide a comprehensive overview of Magic-Angle Spinning (MAS) DNP-NMR studies in materials at high magnetic fields.
• To detail the principles, methods, and applications of DNP-NMR for materials science.

Main Methods:

• Magic-Angle Spinning (MAS) Dynamic Nuclear Polarization (DNP) at high magnetic fields (≥ 5 T).
• Description of DNP transfers, polarization transport via spin diffusion.
• Analysis of DNP-NMR hardware, polarizing agents, and sample preparation for materials.

Main Results:

• DNP enhances NMR sensitivity by 1-3 orders of magnitude, enabling high-resolution spectra.
• Overview of detected isotopes and combined NMR techniques with DNP.
• Demonstration of DNP-NMR's utility in diverse material applications.

Conclusions:

• MAS DNP-NMR is a rapidly developing field with commercial systems available.
• This technique provides unprecedented insights into the structure and dynamics of organic, hybrid, and inorganic materials.
• Applications span health, energy, catalysis, and optoelectronics.