Premium
Novel Structural Modulation in Ceramic Sensors Via Redox Processing in Gas Buffers
Author(s) -
Azad AbdulMajeed,
Akbar Sheikh A.
Publication year - 2006
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2006.02076.x
Subject(s) - ceramic , materials science , oxide , carbon monoxide , partial pressure , hydrogen , metal , porosity , oxygen , redox , nanotechnology , catalysis , chemical engineering , selectivity , chemical physics , composite material , metallurgy , biochemistry , chemistry , organic chemistry , engineering , physics
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. As the sensing mechanism and catalytic activity are predominantly surface‐dominated, benign surface features in terms of small grain size, large surface area, high aspect ratio and, open and connected porosity, are required to realize a successful material. In order to incorporate these morphological features, a technique based on rigorous thermodynamic consideration of the metal/metal oxide coexistence is described. By modulating the oxygen partial pressure across the equilibrium M/MO proximity line, formation and growth of new oxide surface on an atomic/submolecular level under conditions of “oxygen deprivation,” with exotic morphological features, has been achieved in potential sensor materials. This paper describes the methodology and discusses the results obtained in the case of potential semiconducting ceramic oxide‐based carbon monoxide and hydrogen sensors with enhanced characteristics.