Influence of temperature stability on the sensing properties of SAW NOx sensor

Novel scheme to improve SnO2/SAW sensor performance for NO2 gas by detuning the sensor oscillator frequency

“…Few efforts have been made in literature by utilizing polymers or metal oxide thin films as sensing layer for the detection of NO 2 gas using SAW sensors [9][10][11][12]. The sensing layer of copper pthalocyanine (CuPc) film yielded good sensitivity allowing sub ppm level detection of NO 2 gas [11].…”

“…However, high values of response time and recovery time were the major drawbacks of the sensor [10,12]. Dewan et al deposited TeO 2 thin films on the surface of LiNbO 3 based SAW devices and demonstrated the detection of NO 2 gas at room temperature [9]. However the concentration of NO 2 gas was too high (>100 ppm) and selectivity issue was not even accounted [9].…”

“…Dewan et al deposited TeO 2 thin films on the surface of LiNbO 3 based SAW devices and demonstrated the detection of NO 2 gas at room temperature [9]. However the concentration of NO 2 gas was too high (>100 ppm) and selectivity issue was not even accounted [9]. Other reports utilized metal oxides or bilayer structure of polymers and metal oxides as sensing layers for NO 2 gas detection [13,6,14,15].…”

Analysis of palladium and yttrium–palladium alloy layers used for hydrogen detection with SAW device

“…Since pioneer work made by D'Amico and al. [2], innovations concerning the selectivity and stability of sensitive layers versus external parameters have been proposed to improve H 2 detection using SAW devices [3][4][5][6][7][8][9][10].…”

Influence of Ta2O5 on polyaniline surface for liquid petroleum gas sensing applications

“…Hydrocarbon gases, including liquid petroleum gas (LPG) find useful applications, as a clean source of energy at both the domestic and industries. However, the explosive nature of LPG makes requirement of reliable and efficient gas sensors indispensable (Ihokura and Watson, 1994;Vlachos et al, 1996;Korotcenkov, 2007;Korotcenkov et al, 2003Korotcenkov et al, , 2004Pagnier et al, 2000;Gupta et al, 2005;Dewan et al, 2007;Haridas et al, 2008;Madhusudhana Reddy and Chandorkar, 1999). Major constituents of LPG include butane (70-80 percent), propane (5-10 percent) and propylene, butylene, ethylene and methane (1-5 percent).…”