Highly sensitive gas sensor by the LaAlO3 /SrTiO3 heterostructure with Pd nanoparticle surface modulation

Adv Mater. 2014 Sep 10;26(34):5962-8. doi: 10.1002/adma.201401597. Epub 2014 Jul 10.

Abstract

The palladium nanoparticle (Pd NP)-decorated LaAlO3 /SrTiO3 (LAO/STO) heterostructure is for the first time used as a hydrogen-gas sensor with very high sensitivity and workability at room temperature. The outstanding gas-sensing properties are due to the Pd NPs' catalytic effect to different gases, resulting in charge coupling between the gas molecules and the two-dimensional electron gas (2DEG) through the Pd NPs by either a direct charge exchange or a change of the electron affinity. These results provide insight into the emerging properties at LAO/STO interfaces.

Keywords: LaAlO3/SrTiO3; gas sensor; hydrogen; interface; palladium; two-dimensional electron gas.

Publication types

  • Research Support, Non-U.S. Gov't