Transition metal dopants in SrTiO3 exhibit interesting electronic structures and defect chemistries that lead to interesting functional properties such as well-known photochromism and charge-controlled spin dynamics.1 Colloidal nanocrystals possess fundamentally different defects compared to bulk powders or single crystals as the result of high percentage of surface atoms. Using electron paramagnetic spectroscopy we show that the oxidation state of Mn ions in colloidal nanocrystals and bulk powders are different. We also provide spectroscopic evidence that the oxidation state can be altered through facile ex situ chemical perturbations in both nanocrystal, nanocrystal aggregates, and bulk powders. Electronic structural origins of these results will be discussed in the context of surface defects and charge-compensation mechanisms.

Dimensional control over the oxidation state of Mn ions in SrTiO3

2019 Spring National Meeting

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