Selectivity and stability of a tin dioxide sensor for methane

Investigation of gas-sensitivity of sensor structures to hydrogen in a wide range of temperature, concentration and humidity of gas medium

“…We have considered a literary review of works and publications on the gas-sensitive characteristics of various sensor structures in gas mixtures of air with hydrogen [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. The interest of authors of the works has been concentrated on the search of catalytic additives to tin dioxide and search of new semiconductive metal oxides.…”

“…The range of investigated H 2 concentration in all the considered works covers an enough wide area from 10 up to 40,000 ppm, and temperatures from the room means up to 1000 • C, and the humidity only in the limited range of means. Response to H 2 was investigated predominantly at one to three different temperatures or at a narrow temperature interval 100-200 • C, and only in works [1][2][3][4] the measurements were carried out in a wide range of temperatures from 200 to 500 • C. The widest range of temperature was observed in investigations with Ga 2 O 3 : 540-950 • C, 520-870 • C, 600-1000 • C and 680-840 • C, respectively, in works [5][6][7][8]. The concentration dependence was investigated in an enough volume only in eight works: C = 0.01-1.97 vol% [9], C = 500-5000 ppm [10], C = 20-1000 ppm [11], C = 100 ppm -4 vol% [12], C = 200-2000 ppm [13], C = 1000-10,000 ppm [3], C = 500-5000 ppm [4] and C = 10 ppm-2 vol% [14].…”

Role of solute and solvent on the deposition of ZnO thin films

“…ZnO thin films are being widely studied for their interesting optical properties and uses as solar cell window materials and mainly as a very good gas-sensing material. Presently, several nano-forms of ZnO like nanowires, nanorings, nanocombs, nanosprings, etc., are becoming the points of interest for scientists due to their novel applications in dye-sensitized solar cells, optoelectronics, sensors, transducers and bio-medical science, since ZnO is considered to be bio-compatible [1][2][3][4][5][6][7][8][9][10]. The ZnO material is also promising for potential use as a UV light phosphor at room temperature due to free electron excitation, having sufficiently large binding energy to be stable even at room temperature [2,3].…”

Laminating two-layer thick films structure tin oxide-based butane gas sensor operating at low temperature

“…Several designs of sensors' construction, SnO 2 -based, were proposed for achieving the selectivity, sensitivity and stability of combustion gas detection with respect to ethanol vapour such as directly doping of small amounts of noble metals (Pd, Pt, Rh and Ru) into SnO 2 [3][4][5][6][7][8][9][10][11][12][13], a suitable filter containing noble metal catalysts method [14][15][16] and a directly coating selective thin film on the surface of SnO 2 layer structure [17,18].…”