Abstract
Solid-state NMR spectroscopy is a well-established method to obtain atomic-level information about the structure of inorganic materials, but its use is often limited by low sensitivity. We review how solvent generated dynamic nuclear polarization can be used to increase sensitivity in solid-state NMR of inorganic materials, with emphasis on our recent method for hyperpolarization of proton-free bulk. We use selected examples to show how overall gains in sensitivity can be observed in both the surface and bulk spectra of inorganic compounds such as lithium titanate. The hyperpolarization methods reviewed here can be used to improve NMR sensitivity for a range of inorganic materials.
Highlights
Solid-state nuclear magnetic resonance (NMR) spectroscopy is an analytical technique which directly probes molecular symmetry and structure at nuclei, and provides information about the atomic-level structure and dynamics of materials.[1]
As a selected example of how these methods work, we review our recent work on lithium titanates, which are of interest as anode materials in batteries.[7]
We have recently introduced a strategy to hyperpolarize the bulk of inorganic materials, where the relayed Dynamic nuclear polarization (DNP) method is extended to proton-free inorganic materials.[6]
Summary
Solid-state nuclear magnetic resonance (NMR) spectroscopy is an analytical technique which directly probes molecular symmetry and structure at nuclei, and provides information about the atomic-level structure and dynamics of materials.[1]. Since this material is proton-free, the hyperpolarization does not transfer to the material spontaneously 3a shows the difference between the DNP enhanced surface spec- challenging case for solid-state NMR, and even better suited to trum, recorded with 1H-7Li CP, and the ordinary direct 7Li spec- the relayed DNP approach here
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