Enhanced electrocatalytic effects of Pd particles immobilized on GC surface on the nitrite oxidation reactions

Mesoporous Co3O4/SnO2 Nanostructure-Based Heterojunctions for NO2 Sensors

“…As a result of the adsorbed oxygen molecules, a hole accumulation layer (HAL) will form on the surface of Co 3 O 4 . When the oxidized NO 2 comes in contact with the Co 3 O 4 sensor, due to its high electron affinity, the NO 2 molecules will adsorb to the Co 3 O 4 surface and withdraw the electrons from the conduction band as explained in eq . – In addition, by reacting with the chemisorbed O 2 – on the surface, the NO 2 molecules can give rise to the formation of the adsorbed NO 3(ads) – as mentioned in eq , which has the effects of expanding the hole accumulation width and lowering the sensor resistance normalN O 2 ( gas ) + e − → normalN O 2 ( ads ) − 2 normalN O 2 ( gas ) + O 2 ( ads ) − + e − → 2 normalN O 3 ( ads ) − …”

Rapid and highly selective colorimetric detection of nitrite based on the catalytic-enhanced reaction of mimetic Au nanoparticle-CeO2 nanoparticle-graphene oxide hybrid nanozyme

“…Knowing the amount of nitrite can help in assessing the toxicity level and ensuring the value is below or within the acceptable limit of detection. As a result, several methods have reported on nitrite detection, based on kinetic studies and quantitative analysis [33][34][35][36][37][38].…”

High-performance UV-activated room temperature NO2 sensors based on TiO2/In2O3 composite

“…4 In fact, the maximum allowable NO 2 concentration beyond which the respiratory system of non-asthmatic people starts getting affected is less than 3 ppm. [5][6][7][8][9][10][11] Although conventional metal oxide semiconductor NO 2 sensors have satisfactory sensitivity, they have a high operating temperature (>200 °C) and poor selectivity. [12][13][14][15][16] In general, efficient gas sensors are characterized by fast response, high sensitivity, good selectivity, low operating temperature, and stability at room temperature (RT).…”