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Creation of Exotic Features in Metal Oxides by Surface Treatment for Enhanced Gas Sensing
 

Summary: Creation of Exotic Features in Metal Oxides by Surface
Treatment for Enhanced Gas Sensing
Majed Hammoud* and Abdul-Majeed Azad
Department of Chemical and Environmental Engineering
High selectivity, enhanced sensitivity, short response time and
long shelf-life are some of the key features sought in the solid-
state ceramic-based chemical sensors. Since the sensing
mechanism and catalytic activity of ceramics are predominantly
surface-dominated, benign surface features in terms of small
grain size, large surface area and, open and connected porosity,
are required to realize a successful device.
In the case of oxide ceramics, we have developed a technique
based on rigorous thermodynamic consideration of the
metal/metal oxide coexistence. In order to incorporate the
required nanoscale morphological features, a gas phase redox
scheme was adopted. Instead of the classical approach of
reduction by H2 and oxidation by O2 or air, the metal oxide of
interest is reduced and re-oxidized by exposing it to a well-defined
pO2 that is somewhat below (for reduction) and above (for re-
oxidation) the theoretical M/MO coexistence line. Since the

  

Source: Azad, Abdul-Majeed - Department of Chemical and Environmental Engineering, University of Toledo

 

Collections: Materials Science; Energy Storage, Conversion and Utilization