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Porous Metal Oxides as Gas Sensors
Author(s) -
Tiemann Michael
Publication year - 2007
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200700927
Subject(s) - porosity , materials science , economies of agglomeration , replication (statistics) , nanotechnology , metal , porous medium , grain size , volume (thermodynamics) , sensitivity (control systems) , chemical engineering , composite material , metallurgy , electronic engineering , engineering , physics , statistics , mathematics , quantum mechanics
Semiconducting metal oxides are frequently used as gas‐sensing materials. Apart from large surface‐to‐volume ratios, well‐defined and uniform pore structures are particularly desired for improved sensing performance. This article addresses the role of some key structural aspects in porous gas sensors, such as grain size and agglomeration, pore size or crack‐free film morphology. New synthesis concepts, for example, the utilisation of rigid matrices for structure replication, allow to control these parameters independently, providing the opportunity to create self‐diagnostic sensors with enhanced sensitivity and reproducible selectivity.