Different Kinetic Reactivity of Electrons in Distinct TiO₂ Nanoparticle Trap States.

ABSTRACT: Electrons added to TiO₂ and other semiconductors often occupy trap states, whose reactivity can determine the catalytic and stoichiometric chemistry of the material. We previously showed that reduced aqueous colloidal TiO₂ nanoparticles have two distinct classes of thermally-equilibrated trapped electrons, termed Red/e ^- and Blue/e ^-. Presented here are parallel optical and electron paramagnetic resonance (EPR) kinetic studies of the reactivity of these electrons with solution-based oxidants. Optical stopped-flow measurements monitoring reactions of TiO₂/e ^- with sub-stoichiometric oxidants showed a surprising pattern: an initial fast (seconds) decrease in TiO₂/e ^- abs

SUBMITTER: Peper JL 

PROVIDER: S-EPMC8232823 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature