biostudies-literatureUnknown126(41)Shimon DWe use microwave-induced dynamic nuclear polarization (DNP) of the substitutional nitrogen defects (P1 centers) in diamond to hyperpolarize bulk ¹³C nuclei in both single crystal and powder samples at room temperature at 3.34 T. The large (>100-fold) enhancements demonstrated correspond to a greater than 10 000-fold improvement in terms of signal averaging of the 1% abundant ¹³C spins. The DNP was performed using low-power solid state sources under static (nonspinning) conditions. The DNP spectrum (DNP enhancement as a function of microwave frequency) of diamond powder shows features that broadly correlate with the EPR spectrum. A well-defined negative Overhauser peak and two solid effect peaks are observed for the central (<i>m</i> _<i>I</i> = 0) manifold oThe journal of physical chemistry. C, Nanomaterials and interfaces17777-17787https://www.ebi.ac.uk/biostudies/studies/S-EPMC9589901biostudies-literatureLarge Room Temperature Bulk DNP of ¹³C via P1 Centers in Diamond.PMC9589901Joseph LWilliams EQRamanathan CCantwell KATakahashi SShimon DPeng ZfalseLarge Room Temperature Bulk DNP of ¹³C via P1 Centers in Diamond.We use microwave-induced dynamic nuclear polarization (DNP) of the substitutional nitrogen defects (P1 centers) in diamond to hyperpolarize bulk ¹³C nuclei in both single crystal and powder samples at room temperature at 3.34 T. The large (>100-fold) enhancements demonstrated correspond to a greater than 10 000-fold improvement in terms of signal averaging of the 1% abundant ¹³C spins. The DNP was performed using low-power solid state sources under static (nonspinning) conditions. The DNP spectrum (DNP enhancement as a function of microwave frequency) of diamond powder shows features that broadly correlate with the EPR spectrum. A well-defined negative Overhauser peak and two solid effect peaks are observed for the central (<i>m</i> _<i>I</i> = 0) manifold o2022-01-01T00:00:00Z2022 Oct2025-04-04T23:19:53.51Z2025-04-04T23:19:53.51ZS-EPMC95899013630467010.1021/acs.jpcc.2c06145