gas sensing properties of wo3 doped rutile tio2 thick film at high operating temperature

... heat treatment temperature levels. Therefore, rutile TiO 2 based gas sensors can detect gases at high operating temperature with no grain growth. Although, the high heat treatment temperature ensures ... Gas sensing properties of WO 3 doped rutile TiO 2 thick film at high operating temperature Sung-Eun Jo, Byeong-Geun Kang, Sungmoo Heo, Soonho Song, Yong...

Ngày tải lên: 19/03/2014, 16:48

... air at operating temperature (a) 200°C and (b) 250°C. Fig. 3. The relation between the resistance and operating temperature in ambient humidity air. Fig. 4. The in¯uence of calcinations temperature ... the conductance of the sensor. Generally, a higher sintering temperature is needed during the fabrication of gas- sensing elements, and gas sensors have to operate in t...

Ngày tải lên: 19/03/2014, 16:48

... the operating temperature of the sensors for opti- mal sensitivity to these species has been reported. The aim of this work is to study the sensing properties of nanoparticle WO 3 gas sensors doped ... ethanol at temperatures higher than 200 ◦ C. Fig. 4 shows the response sensor to ethanol as a function of the concentration of indium in the sensing layers, when opera...

Ngày tải lên: 19/03/2014, 16:48

... TiO are promising materials for gas sensor 1 . 2 TiO has been mainly studied as a material of O 22 sensor at high temperature as high as 8008C in the form of wx bulk or thick film 2,3 . However, ... resistance of the TiO –Pt film was 32 compared with that of the TiO film. Although the resis- 2 tance of 1H is smaller than that of 2H, the resistance of 1a is large...

Ngày tải lên: 19/03/2014, 16:48

... is well known that MWCNTs materials can be burned out at heat-treated temperatures higher than 550 ◦ C. Fig. 4. Response as a function of operating temperature of the PtO 2 -doped SnO 2 sensors ... vary for heat-treating temperature rang- ing from 500 to 700 ◦ C. Actually, we have already investigated the gas- sensing properties of blank SnO 2 films heat-treated at these...

Ngày tải lên: 19/03/2014, 16:48

... whereas that for 350 ◦ C calcinations are in the range of 30–150 nm. The gas sensing properties of these powders in the form of thick film were investigated with and without platinum doping. Gas response ... response of thick films sintered at two different temperatures was measured at four different operating temperatures. We confirm that the sensor elements made from...

Ngày tải lên: 19/03/2014, 16:48

... investigate the effect of HT on the morphology of the WO 3 microspheres, the heat-treatment temperature (HTT) and duration at HTT were varied. 2.2. Characterization of sample The morphologies of the ... 20 ◦ C/min) and (c) R30 powders heat treated at 450 ◦ C for 1h (heating rate: 5 ◦ C/min) (RH-SD: rapid heating and short duration at heat treatment temperature; RH: rapid heat...

Ngày tải lên: 19/03/2014, 16:48

... conditions (Na 2 Sat50 ◦ C, Na 2 Sat80 ◦ C, H 2 Sat50 ◦ C and H 2 Sat80 ◦ C) were studied at four operating volt- ages (2, 5, 10 and 20 V). The highest values of response to NO 2 at room temperature are ... NO 2 was that based on PbS prepared with Na 2 Sat50 ◦ C. This sensor had the highest response value at 5V operating voltages. The response and recovery time of sensors at...

Ngày tải lên: 20/03/2014, 13:06

... systems operated at ambient temperature [13–15]. It might be attributed to the low opera- tion temperature leading to slow desorption rate of pre-adsorbe d moieties. As an annealing temperature increases ... operated at room temperature. 4. Conclusion We have investigated the dependence of gas- sensing character- istics on thermal treatment conditions in a tungsten oxide na...

Ngày tải lên: 20/03/2014, 13:11

... film. Main aim of present work is the experimental validation of enhanced gas sensing response of nanopatterned metal oxide thin film sensors. Two different kinds of gas sensor with nanopatterned sensitive ... cheap nanofabrication process for titania (TiO 2 ) polycrystalline nanowire array for gas sensing applications with lateral size ranging from 90 to 180 nm, and gas se...

Ngày tải lên: 20/03/2014, 13:11