Approaches to the Improvement of Metal Oxide Structure Stability

3 Approaches to the Improvement of Metal Oxide Structure Stability 

It should be noted that it is impossible to determine the main reason for gas sensor instabilities in a general sense the task is too complicated. In addition, the reasons for instability could depend on the constructive and/or technological features of the sensor fabrication or on temperature effects at the point of use. Therefore, at present there are a great number of approaches, aU of which—in the author s opinion—can be effective in resolving instability problems in gas sensors. According to Korotcenkov and Cho (2011), to attain maximum gas sensor operational stability, it is necessary to stick to the following recommendations. 

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Korotcenkov G, Cho BK (2011) Instability of metal oxide-based conductometric gas sensors euid approaches to stability improvement (short survey). Sens Actuators B Chem 156 527-538 Korotcenkov G, Han SD (2009) (Cu, Fe, Co and Ni)-doped SnO films deposited by spray pyrolysis doping influence on thermal stability of SnO film structure. Mater Chem Phys 113 756-763 Korotcenkov G, Boris I, Brinzari V, Luchkovsky Y, Karkotsky G, Golovanov V, Comet A, Rossinyol E, Rodriguez J, Cirera A (2004) Gas sensing characteristics of one-electrode gas sensors on the base of doped In O ceramics. Sens Actuators B Chem 103 13-22... 

To overcome the stability problem, it is obvious that an alternative approach to material synthesis would be needed. In this respect a recent report suggested that iron oxide encapsulated in meso- and macroporous carbon can be used as anode in Li batteries and reaches a greatly improved reversibility and rate performance. At the same time, a similar structure for a cathode material based on iron and lithium fluoride was synthesized and investigated. It was demonstrated that encapsulation of transition metal-metal fluoride in nanocarbon might be an effective strategy to improve the cycling performance of such a cathode material. ... 

The comparison of the results obtained in this study for the LCP degradation imder processing temperatures with the peculiarities of some thermally stable polyheteroaiylenes degradation [14] brings to light some common features carbonization of the structure, H2 evolution, improvement in thermo-oxidative stability with transition metal compoimds. That is why we took into accoimt the stabilization of polysulfones, aiyl-aliphatic polyimides, polyamides etc. The approach to such stabilization is based on the following proposals on the mechanisms of the above said polymer degradation ... 

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