gas sensor development
development of an ozone gas sensor using single - walled carbon nanotubes
... 2009 Keywords: Single-walled carbon nanotubes Gas sensor O 3 gas N,N-dimethylformamide (DMF) Thermal treatment abstract This study deals with the fabrication of an ozone gas sensor using single-walled carbon ... 5. Sensor response to oxygen: (1) and (3), oxygen injection to gas chamber; (2) and (4), turning on a microheater and outgassing the gas chamber by using rotary pump....
Ngày tải lên: 19/03/2014, 16:47
unconventional gas shales development technology and policy issues ppt
Ngày tải lên: 08/03/2014, 16:20
a selective nh3 gas sensor based on fe2o3–zno nanocomposites at room temperature
... enhance 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 ... NH 3 . Fig. 4. Selectivity of the gas sensor based on pure ZnO nanoparticle. H. Tang et al. / Sensors and Actuators B 114 (2006) 910–915 913 Fig. 5. Selectivity of the gas sensors base...
Ngày tải lên: 19/03/2014, 16:47
ammonia gas sensor based on electrosynthesized polypyrrole films
... analysis of NH 3 vapors and (b) schematic drawing of the ammonia gas sensor. 2. Experimental 2.1. Fabrication of gas sensors The gas sensors were fabricated using microsystem technolo- gies, and ... in gas sensors for the detection of ethanol gas [54], benzene, xylene and toluene [55]. Other studies focused on ammonia gas sensors using polypyr- role as sensitive layer. Thus, an...
Ngày tải lên: 19/03/2014, 16:47
comparative study of nanocrystalline sno2 materials for gas sensor application
... decades, the development of thick film materials for tin dioxide based gas sensors enabled the fabrication of sensitive and relatively selective gas sensors. However, long-term stability of the sensors ... [4]. 2.3. Sensor characterization The sensor responses were measured in 0.2, 0.6 and 1.0 vol. % of propane in synthetic air at 50% RH. The gas concentrations and gas humidificat...
Ngày tải lên: 19/03/2014, 16:47
crystalline structure, defects and gas sensor response
... not so usual in the field of gas sensors. Gas sensors based on WO 3 obtained by this route showed a better sensor response to NO 2 than that of pyrolytic WO 3 -based gas sensors under the same test ... humidity sensor. Gas sensor response was calculated as the resistance ratio R gas /R air for both gases. Operating temperature of the sensor devices was varied between 200 and 3...
Ngày tải lên: 19/03/2014, 16:47
gas sensor response of pure and activated wo3 nanoparticle
... a gas source, a gas blender (Signal series 850), and a test chamber. Synthetic air was used as a carrier gas at a constant flow rate 1 l/min. Diverse parameters – such as sensor temperature, gas ... sensitivity of the active layer upon gas exposure was defined as the ratio G gas /G air , where G gas and G air denote the conductance of the sensor exposed to a test gas (H 2 S,...
Ngày tải lên: 19/03/2014, 16:48
highly sensitive and selective ammonia gas sensor - solid state
Ngày tải lên: 19/03/2014, 16:48
highly sensitive thin film nh3 gas sensor operating at room
... nm. Like semiconductor oxide gas sensors, the response of the com- posite gas sensors could relate with the reactivity and diffusion of gas molecules inside the gas- sensing layers [49]. Therefore, a ... Japan). Fig. 1. Apparatus for gas sensor testing. 890 N. Van Hieu et al. / Sensors and Actuators B 129 (2008) 888–895 The gas- sensing measurements were carried out as follows. Th...
Ngày tải lên: 19/03/2014, 16:48
influence of polymerization temperature on nh3 response of pani tio2 thin film gas sensor
... NH 3 . The gas response is defined as (R gas − R air )/R air , where R air is the resistance of sensor in air and R gas is the steady resistance of sensor in the presence of a tested gas. The response ... envi- ronment, and a large volume of research has been focused on the development and fabrication of gas sensors for detection of gaseous chemicals. Choice of suitable sensing...
Ngày tải lên: 20/03/2014, 13:04