Radical-free dynamic nuclear polarization using electronic defects in silicon

Abstract

Direct dynamic nuclear polarization of 1H nuclei in frozen water and water-ethanol mixtures is demonstrated using silicon nanoparticles as the polarizing agent. Electron spins at dangling-bond sites near the silicon surface are identified as the source of the nuclear hyperpolarization. This novel polarization method open new avenues for the fabrication of surface engineered nanostructures to create high nuclear-spin polarized solutions without introducing contaminating radicals, and for the study of molecules adsorbed onto surfaces.

References in corpus (3)

• Hyperpolarized Long-T1 Silicon Nanoparticles for Magnetic Resonance Imaging
• Dynamic Nuclear Polarization in Silicon Microparticles
• Surface-sensitive NMR in optically pumped semiconductors

Cited by in corpus (8)

• Hyperpolarized Nanodiamond with Long Spin Relaxation Times
• Enhanced dynamic nuclear polarization via swept microwave frequency combs
• Hyperpolarized relaxometry based nuclear T1 noise spectroscopy in hybrid diamond quantum registers
• Large Room Temperature Bulk DNP of ${}^{13}$C via P1 Centers in Diamond
• Tailored nanodiamonds for hyperpolarized 13C MRI
• Chemisorption of water on the surface of silicon microparticles measured by DNP-enhanced NMR
• DNP-NMR of surface hydrogen on silicon microparticles
• Optical dependence of electrically-detected magnetic resonance in lightly-doped Si:P devices