Год выпуска: 2012 Автор: Sanjay Jadhav Издательство: LAP Lambert Academic Publishing Страниц: 240 ISBN: 9783848487479
Описание
The gas sensing mechanism is based on conductance of the ferrites. The oxygen adsorbed on the surface of the material influences conductance of the ferrite. The amount of oxygen on the surface of the material depends on the particle size, specific area and operating temperature of the sensor. The interaction between the sensing material and gas to be detected determines the gas response. Generally, photocatalytic degradation of organic compounds includes various processes. An electron is excited from the valence band to the conduction band (CB) of metal oxides by absorption of light with energy equal to or greater than the band gap of the semiconductor. The separated photoinduced electrons and holes transfer to the semiconductor surface efficiently. At the surface, electrons react with acceptors (usually O2 dissolved in the solution) to produce oxidant species, for example hydroxyl radicals. Meanwhile, holes react with donors (H2O, OH–) to produce oxidant species. Oxidant species...
