Abstract
Most of gas sensors are "surface type" gas sensors that utilize only changes in physical properties near the surface of grains. In this paper, the concept of "non-surface type" gas sensors that utilize changes in physical properties throughout the entire grain is proposed. In particular, we focused on a resistive oxygen sensor as one type of "non-surface type" gas sensor, and achieved notable performance with high-speed response to the order of milliseconds. Furthermore, in order to achieve highly sensitive and highly selective "non-surface type" gas sensors, a new sensor material was developed consisting of alternating layers at the molecular level of an inorganic layer. Aldehyde gases were detected selectively by appropriate nanostructural design of the new material.
