Fig. 8
From: Sensitive Cross-Linked SnO2:NiO Networks for MEMS Compatible Ethanol Gas Sensors
Schematics diagram of gas-sensing mechanism of cross-linked SnO2:NiO network. a, b Schematic diagram of the energy band configurations for SnO2:NiO network in air and in ethanol vapor. In the diagram, CB is the conduction band, VB is the valence band, Eg is the band gap, Ef is the Fermi level, and e− is the charge of an electron. The depletion layers at the SnO2/NiO interface are indicated by blue rectangles. c, d Schematic model showing the sensing mechanism of the SnO2:NiO network exposed in air and ethanol, respectively. The yellow lines indicates the wide depletion region in the holes of cross-linked SnO2:NiO network