glucose - mediated hydrothermal synthesis and gas sensing characteristics of wo3 hollow microspheres

... hydrothermal synthesis and gas sensing characteristics of WO 3 hollow microspheres Choong-Yong Lee, Sun-Jung Kim, In-Sung Hwang, Jong-Heun Lee ∗ Department of Materials Science and Engineering, Korea ... CuO) hollow spheres by one-pot hydrothermal reaction of a solution con- taining metal ions and glucose and subsequent decomposition of core carbon. In addi...

Ngày tải lên: 19/03/2014, 16:48

... spectroscopy, and the results indicate that the Co-doped WO 3 nanostructures are semiconducting with direct band gaps of 2.26eV and 2.77 eV. The gas sens- ing performance of the as-prepared Co-doped ... the Co-doped WO 3 products. This process is similar to what happens in the synthesis of WO 3 urchin-like microspheres. Finally, the as-formed urchin- like microspheres further...

Ngày tải lên: 20/03/2014, 13:04

... Fe 3+ –H 2 O hydrothermal system. To the best of our knowledge, this is the first report of the selective synthesis of ␣-Fe 2 O 3 superstructures and nanocubes. The gas- sensing properties of the ␣-Fe 2 O 3 superstructures, ... difference in the sensing perfor- mance of the three kinds of sensors, the BET surface area of the nanocubes, hollow sea urchin-like nanostru...

Ngày tải lên: 05/05/2014, 15:26

... ZnOAIn(OH) 3 nano- composite samples were also examined. Both prism- and rasp- berry-like series show similar characteristics. As illustrated, the UV–V is absorbance spectra of raspberry-like ZnO and nanocom- posite ... the intensity of UV- and visible-emission peaks of ZnO increases, in addition two new blue emission bands with a maxi- mum at 421 nm and 440 nm can also be obse...

Ngày tải lên: 06/05/2014, 13:24

... Electrical and gas- sensing properties of WO 3 semiconductor material Wang Yu-De * , Chen Zhan-Xian, Li Yan-Feng, Zhou Zhen-Lai, Wu Xing-Hui Department of Materials Science and Engineering, ... [15]. 4.2. Gas- sensing mechanism The gas- sensing mechanism is based on the changes in the conductance of WO 3 . The reducing gas reacted with oxygen adsorbed on the surface of...

Ngày tải lên: 19/03/2014, 16:48

... Electrical and optical properties of WO 3 thin films, Thin Solid Films 397 (2001) 238–243. [8] W. Yu-De, C. Zhan-Xian, L. Yan-Feng, Z. Zhen-Lai, W. Xing-Hui, Electri- cal and gas- sensing properties of ... Au/WO 3 and Pd/WO 3 at T work = 300 ◦ C, and resulting sensing response “S gas ” of the sensors calculated by using the relations: S gas = G gas − G 0 G 0 for reduci...

Ngày tải lên: 19/03/2014, 16:48

... systematically gas- sensing characteris- tics such as response magnitude and detection time by means of careful control of the relative population ratio between W 5+ and W 6+ states. The sensing characteristics ... prepared tungsten oxide films by drop-coating single-crystalline, size-controlled WO 2.72 nanorod solution, and then investigated the dependence of their material...

Ngày tải lên: 20/03/2014, 13:11

... oxidizing gases, CO, O 2 and CO 2 , at 600 °C, and a gas mixture (NO 2 + oxidizing gases) with CO, O 2 and CO 2 concen- trations of 1000 ppm, 15% and 10%, respectively. The detection re- sults of the ... oxidizing gases and the gas mixture are shown in Figs. 6 and 7.InFig. 6, sensitivities of the sensor (15 wt.% WO 3 doped TiO 2 ) to CO, O 2 and CO 2 were very small....

Ngày tải lên: 19/03/2014, 16:48

... were prep ared by the glucose- mediated, one-pot hydrothermal synthesis of Z n-coated carb on spheres and then calcined at 500 1C, the hollow ZnO microspheres with diameters of 1–2 m m were gradually ... ZnO hollow spheres are prepared by the one-pot hydrothermal reaction. The study focuses on the formation mechanism of ZnO hollow spheres and the effect of hollow...

Ngày tải lên: 06/05/2014, 13:22

... sized gas molecules like VOCs. In this study, we fabricated porous gas sensing filmscomposed of TiO 2 nanotubes prepared by a hydrothermal treatment and studied the gas sensing properties of the ... film Hydrothermal treatment abstract Preparation and morphology control of TiO 2 nanostructured films for gas sensor applications were inves- tigated. To examine the effect...

Ngày tải lên: 19/03/2014, 16:48