[2A06-13] Surface Science / Chemical Property (SS2)

4:00 PM - 4:30 PM JST(7:00 AM - 7:30 AM UTC)

[2A10【若手学会賞】] Probing atomic-level-structure of oxide surfaces by DNP surface-enhanced NMR spectroscopy

*Hiroki Nagashima¹ (1. National Institute of Advanced Industrial Science and Technology (AIST), Catalytic Chemistry Research Institute (Japan))

DNP-SENS enables sensitive surface analysis of inorganic nanomaterials. However, its application to half-integer quadrupolar nuclei, which make up most NMR-active isotopes, remains limited. We developed a D-RINEPT method using adiabatic dipolar recoupling to enhance polarization transfer from ¹H to quadrupolar nuclei such as ¹⁷O, ⁴⁹Ti, and ⁶⁷Zn. To overcome resolution loss from second-order quadrupolar broadening, especially at low magnetic fields, we combined D-RINEPT with 2D techniques like MQMAS scheme and DQ-SQ homonuclear correlation. These methods enabled detailed ¹⁷O surface characterization of oxide nanoparticles and zeolites, including post-synthetic ¹⁷O enrichment strategies.

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