Detection mechanism of metal oxide gas sensor under UV radiation

Ozone sensing properties of ZnO nanostructures grown by the aqueous chemical growth technique

“…It is assumed that the small substrate coverage and the minimal formation of nanostructures lead to the small current changes observed under subsequent photoreduction/oxidation cycles (I ph = 1 × 10 −8 A, I o = 1.7 × 10 −12 A). It is, in general, believed that the electrical current changes in semiconductor metal oxide sensors are mainly controlled by the interactions of UV irradiation and oxidizing gas atmosphere with the metal oxide surface [9,11,18,19]. Therefore, the small surface-to-volume ratio of the 1 h ZnO sample leads to the lowest S value observed (S = 5.9 × 10 4 ) among the investigated sample series.…”

High sensitivity ethanol gas sensor based on Sn - doped ZnO under visible light irradiation at low temperature

“…When visible light radiation fell on the Sn-doped ZnO polycrystalline film, photoactivated electrons were generated in the conduction band. Optical excitation decreased the inter-grain barrier height, thereby increasing the density of free carriers through the material 20 . As a result, the ambient oxygen molecules reacted with the photoelectrons as follows 21,22 :…”

Polypyrrole/Metal Sulphide Hybrid Nanocomposites: Synthesis, Characterization and Room Temperature Gas Sensing Properties

“…[1][2][3][4][5][6][7] Over the decade, there has been a steady progress in the applications of conjugated conducting polymers (CPs) such as in chemical sensors, electrochemical supercapacitors, electro chromic and photovoltaic devices, light-emitting diodes and batteries. The years in the last decade have also witnessed consistent efforts by researchers in improving the physical and structural properties of CPs.…”

“…The years in the last decade have also witnessed consistent efforts by researchers in improving the physical and structural properties of CPs. 1,[5][6][7][8][9][10][11][12] The physical and structural attributes of CPs are generally affected by crucial parameters such as polymerization method, type of the oxidant, pH and temperature conditions during polymerization, etc. In recent times, however, tuning of CPs' properties has also been attempted by use of nanomaterials.…”