Nanostructure Modified Porous Interfaces for Enhanced Sensing and Directed Microcatalysis

摘要

Gaseous analyte interactions on a metal oxide decorated n-type porous silicon interface show a dynamic electron transduction to and from the interface depending upon the relative strength of the gas and metal oxides. The dynamic interaction of NO with TiO_2, SnO_2, NiO Cu_xO, and Au_xO, in order of decreasing acidity, demonstrates this effect. Surface interactions are also controlled by the in-situ nitridation of the oxide nanoparticles, enhancing the basicity of the decorated interface.. This process changes the interaction of the interface with the analyte. The observed change to the more basic oxynitrides does not represent a simple increase in surface basicity but appears to involve a change in molecular electronic structure which is well explained by the 1HSAB model..