It is observed that the gas interaction with oxide nanoforms effectively changes the effective dielectric constant which is measurable in terms of capacitance change of the device. However, microwave transmission, reflection and absorption also are related to dielectric constant. But it is not clear that in which or what proportionate, these parameters (transmission, reflection and absorption) will change due to gas interaction. Is there any probability to absorb different frequency depending on different gas ambient? If it is, then what measures should be considered?
A simple definition of nanoform can be found in the following paper
https://ec.europa.eu/health/scientific_committees/docs/citizens_zinc_oxide_en.pdf
Best Regards
Tank you for your kind interest Prof. Thidé.
The "Oxide nanoforms" is referred to as the nanotube of outer diameter is about 70 nm and its length is about 500 nm. Spacing in between them is ~50 nm. The oxide is non-stochiometric one, means it have property to form dangling bonds with the oxygen in the atmosphere. These oxygen is termed as 'pre-adsorbed oxygen'. By the 'gas interaction', the gas is oxidized by pre-adsorbed oxygen leaving back the electrons (which were used for forming the dangling bond) to the oxide surface and hence the conductivity of the oxide increases. On the other hand, if it is measured the capacitance of the device, the mixing of test gas within the spacing result in the effective dielectric constant change. So the capacitance will be changed. It is also known that, the resonating frequency depends inversely on the square root of dielectric constant. But in case of microwave absorption, how does the nanoforms helps the absorption capability? Is there should be an effect on the same of the gas interaction?
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