Direct <i>in situ</i> spectroscopic evidence of the crucial role played by surface oxygen vacancies in the O<sub>2</sub>-sensing mechanism of SnO<sub>2</sub>
Stefan Kucharski, Pilar Ferrer, Federica Venturini, Georg Held, Alex S. Walton, Conor Byrne, James A. Covington, Sai Kiran Ayyala, Andrew M. Beale, Christopher S. Blackman
Abstract
NAP-XPS characterisation of SnO 2 under operando conditions shows that resistance change, band bending and surface O-vacancy concentration are correlated with ambient O 2 concentration, challenging current preconceptions of gas sensor function.
Topics & Concepts
OxygenX-ray photoelectron spectroscopyStoichiometryGas phaseChemical physicsChemistrySynchrotron radiationAnalytical Chemistry (journal)Materials scienceChemical engineeringPhysical chemistryEnvironmental chemistryOpticsEngineeringPhysicsOrganic chemistryGas Sensing Nanomaterials and SensorsAnalytical Chemistry and SensorsZnO doping and properties