h2s sensors based on tungsten oxide nanostructures
h2s sensors based on tungsten oxide nanostructures
... 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 tungsten oxide nanos- tructures ... centrifugation was washed with ethanol. The various tungsten oxide nanostructures were characterized by X-ray diffraction (Cu K␣ radiation), scanning electron microscopy (...
Ngày tải lên: 19/03/2014, 16:48
low-temperature h2s sensors based on ag-doped fe2o3 nanoparticles
... generally mentioned earlier, the gas-sensing mechanism of ␣-Fe 2 O 3 -based sensors belongs to the surface-controlled type, which is based on the change in conductance of the semiconductor. The ... to lower energy consumption, which is one of current pursuits in solid-state gas sensors. Based on the above results, we can see that the Ag/␣-Fe 2 O 3 sensors exhibit much better re...
Ngày tải lên: 20/03/2014, 13:04
semiconductor gas sensors based on nanostructured tungsten oxide
... 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 ... narrow 20 . The starting material Ž. was a tungsten pellet 99.95% positioned in the evap- orationrcondensation chamber, where the heating and oxidation of the tungsten occurs. A surroundin...
Ngày tải lên: 20/03/2014, 13:07
xps studies of active elements surface of gas sensors based on wo3nanoparticles
... 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 nanodisperse nonstoichiometric ... defects on the surface and unusual charge states of ions. An explosion in coordinated con- ditions was chosen for synthesis, injected energy was E = 1.9·E s , where E s is the sublim...
Ngày tải lên: 20/03/2014, 13:12
Báo cáo khoa học: Piezoelectric sensors based on molecular imprinted polymers for detection of low molecular mass analytes potx
... Polymerization format Monomer selection Medium selection Polymerization conditions Covalent Bulk polymerization Combinatorial screening Organic solvent Cross-linking agent selection Noncovalent ... [17,53–55]. Application areas of MIP–QCM biosensors The three most common application areas for MIP– QCM sensors are clinical diagnosis, environmental monitoring and control of enantiomeric separ...
Ngày tải lên: 23/03/2014, 07:20
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 and ... temperature operation, which are unattainable by the conventional materials. The major drawback, however, remains due to difficulties in mass pro- duction of sensors based...
Ngày tải lên: 20/03/2014, 13:07
One dimensional organic nanostructures a novel approach based on the selective adsorption of organic molecules on silicon nanowires
... Surface Science Letters One-dimensional organic nanostructures: A novel approach based on the selective adsorption of organic molecules on silicon nanowires Eric Salomon * , Antoine Kahn Department ... chemisorption of specific molecules on silicon nanowires. STM data demonstrate that depending on the molecular functional groups, the molecules adsorb either randomly on the substra...
Ngày tải lên: 16/03/2014, 15:35
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 ... micelle configuration or by the polymerization of carbon spheres and subsequent encapsulation of metal hydroxide during the Page 10 of 73 Accepted Manuscript 10 hydrothermal/solvothermal reactio...
Ngày tải lên: 19/03/2014, 16:48
gas sensors using hierarchical and hollow oxide nanostructures
... 2009 Available online 3 May 2009 Keywords: Hierarchical nanostructures Hollow structures Oxide semiconductor gas sensors Gas response Gas response kinetics abstract Hierarchical and hollow oxide nanostructures ... manipulating the concentration of source solution during heterocoagulation and controlled hydrolysis reactions, and (3) controlling the local pre- cipitation at the surfac...
Ngày tải lên: 19/03/2014, 16:48
gas sensors using hierarchical and hollow oxide nanostructures overview2
... 2009 Available online 3 May 2009 Keywords: Hierarchical nanostructures Hollow structures Oxide semiconductor gas sensors Gas response Gas response kinetics abstract Hierarchical and hollow oxide nanostructures ... manipulating the concentration of source solution during heterocoagulation and controlled hydrolysis reactions, and (3) controlling the local pre- cipitation at the surfac...
Ngày tải lên: 05/05/2014, 15:29