semiconductor gas sensors based on nanostructured tungsten oxide
semiconductor gas sensors based on nanostructured tungsten oxide
... Ž. Thin Solid Films 391 2001 255᎐260 Semiconductor gas sensors based on nanostructured tungsten oxide J.L. Solis a,1 , S. Saukko b , L. Kish a,2 , C.G. Granqvist a , ... vaporization of metal tungsten in a reactive atmosphere was used to produce UFP powder of WO for screen printing. 3 A drawback of the conventional semiconductor gas sensors is their operation at ... fil...
Ngày tải lên: 20/03/2014, 13:07
room-temperature semiconductor gas sensor based on nonstoichiometric tungsten oxide nanorod film
... Room-temperature semiconductor gas sensor based on nonstoichiometric tungsten oxide nanorod film Yong Shin Kim, a͒ Seung-Chul Ha, Kyuwon Kim, b͒ Haesik Yang, c͒ Sung-Yool Choi, and Youn Tae Kim Electronics ... sensor systems in the cost-conscious gas sensor market. Nanosized tungsten oxide particles have been found use- ful in fabricating gas sensors for the detection of...
Ngày tải lên: 20/03/2014, 13:07
room-temperature semiconductor gas sensor based on nonstoichiometric
... Room-temperature semiconductor gas sensor based on nonstoichiometric tungsten oxide nanorod film Yong Shin Kim, a͒ Seung-Chul Ha, Kyuwon Kim, b͒ Haesik Yang, c͒ Sung-Yool Choi, and Youn Tae Kim Electronics ... sensor systems in the cost-conscious gas sensor market. Nanosized tungsten oxide particles have been found use- ful in fabricating gas sensors for the detection of...
Ngày tải lên: 20/03/2014, 13:07
xps studies of active elements surface of gas sensors based on wo3nanoparticles
... nonstoichiometric tungsten oxides, which demonstrated high sensor response to molecu- lar hydrogen and rare gases at room temperature. Earlier the effect of sensitivity to rare gases at physical adsorption ... work conditions important is the exploration of the state of sensor’s surface after long contact with air at room temperature and influence of short-time anneal. We synthesized nanodis...
Ngày tải lên: 20/03/2014, 13:12
h2s sensors based on tungsten oxide nanostructures
... response Fig. 4. (a) Gas sensing characteristics of tungsten oxide nanoparticles to 1000 ppm H 2 S, and (b) variations in response with concentration of H 2 Sat 250 ◦ C. C.S. Rout et al. / Sensors ... however, show a response of ∼150 at 50 ◦ C to 1000 ppm of H 2 S, but we found a reasonably good response value even at 50–100 ◦ C. The concentration-variation of response of the tungste...
Ngày tải lên: 19/03/2014, 16:48
a selective nh3 gas sensor based on fe2o3–zno nanocomposites at room temperature
... the gas sensing properties of the ZnO nanosensors, and the composition of Fe:Zn = 2% is the best for the Fe 2 O 3 –ZnO nanocomposite thin film gas sensors. 5. Conclusion Gas sensors based on Fe 2 O 3 –ZnO ... crystallization of the Fe 2 O 3 –ZnO nanocomposites. It is well known that the sensing mechanism of semiconducting oxide gas sensors is based on the surface reacti...
Ngày tải lên: 19/03/2014, 16:47
ammonia gas sensor based on electrosynthesized polypyrrole films
... ammonia concentrations, we can plot the variation of the slope versus ammonia concentrations. Fig. 6b represents the evolution of the slope versus the ammonia concentration. Above concentrations ... obtain different NH 3 concentrations. This experimental set-up allowed PPy -based gas sensors to be exposed to the different ammonia concentrations. The effect of gases on the sensor’s elec...
Ngày tải lên: 19/03/2014, 16:47
gas sensing properties of nanocrystalline tungsten oxide synthesized by acid
... ofthese sensorsis based on the detection of a change in resistance on exposure to a gas. Due to the constraints of gas permeation only the surface layers are affected by such reactions. Among various ... Introduction Gas sensors are used for many applications such as process controls in chemical industries, detection of toxic environmental pollutants, and for the prevention of ha...
Ngày tải lên: 19/03/2014, 16:48
gas sensors using hierarchical and hollow oxide nanostructures overview
... manipulating the concentration of source solution during heterocoagulation and controlled hydrolysis reactions, and 3) controlling the local precipitation at the surface region of the droplets ... to the rapid gas diffusion. This is analogous to enhancing the gas response [114-116] and/or gas responding kinetics [117] by decreasing the film thickness in the thin-film gas sensors....
Ngày tải lên: 19/03/2014, 16:48
gas sensors using hierarchical and hollow oxide nanostructures
... 333 9. Conclusions In oxide semiconductor gas sensors, achieving both high gas response and fast responding kinetics remains a challenging issue because any increase in the surface reaction sites ... 2009 Available online 3 May 2009 Keywords: Hierarchical nanostructures Hollow structures Oxide semiconductor gas sensors Gas response Gas response kinetics abstract Hierarchi...
Ngày tải lên: 19/03/2014, 16:48