Effect of temperature on gas sensing properties of lithium(Li)substituted(N

A reliable chemiresistive sensor of nickel-doped tin oxide (Ni-SnO2) for sensing carbon dioxide gas and humidity

“…In this case, the sensitivity might be controlled through adsorption from 100 to 275 C, whereas desorption started from 275-400 C. At a particular temperature, adsorption and desorption were equal and the equilibrium position was reached. 2,50 In the present case, the optimum sensing temperature of the pristine SnO 2 and Ni-SnO 2 sensors for CO 2 gas was 275 C. The sensitivity varied from 62 to 73.29 and the maximum sensitivity with a 4 s response time was obtained when x ¼ 0.4 for 100 ppm CO 2 gas, which was comparable with other values reported recently ( Table 1). The fabricated pristine SnO 2 and Ni-SnO 2 sensors were basically chemiresistive, where the sensor resistance was controlled by the CO 2 gas molecules and the chemisorbed oxygen molecules.…”

Role of Ruthenium in the Dielectric, Magnetic Properties of Nickel Ferrite (Ru–NiFe2O4) Nanoparticles and Their Application in Hydrogen Sensors

“…62 Our previous report on Li–NiFe 2 O 4 demonstrated an optimum sensing temperature at 200 °C. 57 Among Ru–NiFe 2 O 4 NP gas sensors, the gas sensor annealed at 300 °C showed the highest gas response, which is attributed to the presence of smaller-sized particles and the presence of the α-Fe 2 O 3 . In fact, the co-existence of Fe 2 O 3 and NiFe 2 O 4 phases can generate heterojunctions, which significantly can modulate the electrical resistance of the gas sensor.…”

“…61 In our previous Li–NiFe 2 O 4 gas sensor, a response of 1.08–100 ppm hydrogen gas at 200 °C was documented. 57 The response increases from 25 to 100 °C and then decreases at 150 °C. Accordingly, the optimal sensing temperature is 100 °C.…”

Tailoring of electrical properties in nanostructured (NiO)0.25(Fe2O3)0.75 composite and compound for sensing applications

“…They have applications in various electronic, magnetic and high frequency devices from past few decades and their most attractive is in gas sensing [1,2] in environmental protection, explosive gases, combustible gases and to control fermentation in the food industry. Gas detection depends on various properties of material like optical, electrical, calorimetric etc and spinel ferrites possess all above mentioned characteristics and are superior as compared to the other materials like carbonaceous allotropes, carbon polymer composites, conducting polymers etc used as gas sensors [1][2][3]. Among inverse spinel ferrites, the most suitable ferrite used for gas sensor is nickel ferrite and is used for the detection of various gases like chlorine, acetone, NOx, CO, NH 3 , H 2 and H 2 O [4][5][6][7][8][9][10].…”

“…Nickel ferrites are soft magnetic materials with cubic inverse spinel structure. They have applications in various electronic, magnetic and high frequency devices from past few decades and their most attractive is in gas sensing [1,2] in environmental protection, explosive gases, combustible gases and to control fermentation in the food industry. Gas detection depends on various properties of material like optical, electrical, calorimetric etc and spinel ferrites possess all above mentioned characteristics and are superior as compared to the other materials like carbonaceous allotropes, carbon polymer composites, conducting polymers etc used as gas sensors [1][2][3].…”