A new type of trapping center for molecules with dipole moments in insulators

Hydrogen Concentration Control in Oil-Filled Power Transformers Using Field Effect Capacitive Gas Sensors

“…2b) up to 10 nm thick, gas molecules are adsorbed on traps with a surface density of the order of 10 11 cm -2 , which leads to a change in the sensor capacitance (pF) due to the shift of its capacitance-voltage characteristic. [26][27][28] An example of the MIS sensor capacitancevoltage characteristic shift under the various hydrogen concentrations action in the air is shown in the Fig. 4.…”

“…Therefore, molecules of even polyatomic gases can freely pass through numerous pores between nano crystallites up to the Pd-Ta 2 O 5 interface. In the Pd x (Ta 2 O 5 ) y transition layer (Fig.2b) up to 10 nm thick, gas molecules are adsorbed on traps with a surface density of the order of 10 11 cm -2 , which leads to a change in the sensor capacitance (pF) due to the shift of its capacitance-voltage characteristic [26][27][28]. An example of the MIS sensor capacitancevoltage characteristic shift under the various hydrogen concentrations action in the air is shown in the Fig.4.…”