novel hexagonal wo3 nanopowder with metal decorated carbon nanotubes as no2 gas sensor

... A vailable online at www.sciencedirect.com Sensors and Actuators B 133 (2008) 151–155 Novel hexagonal WO 3 nanopowder with metal decorated carbon nanotubes as NO 2 gas sensor Csaba Bal ´ azsi a,∗ , Katar ´ ına ... as a p-type material (simi- larly to the carbon nanotubes) , as its resistance decreases under NO 2 (i.e., oxidizing gas) exposure (see Fig. 4b). Fig....

Ngày tải lên: 20/03/2014, 13:05

... conductance of the gas sensor decreases from its origina l electrical potential to the electrical potential due to adsorption. As the ethanol gas was removed, conductance of the gas sensor was lost. Similar ... the gas sensor applications of CNTs have been reported recently [9–16]. Hyeok et al. [17] fabricated a gas sensor from a nanocomposite by polymerizing pyrrole monom...

Ngày tải lên: 20/03/2014, 13:06

... WO 3 thin films micro -gas sensor was fabricated and the NO 2 gas- sensing as well as electrical properties have been investigated. The film had nano-sized grains, porous structure with a relative surface ... sensitivity of 23, as we know it is unique NO 2 gas sensor which has the sensitivity at such a low temperature. © 2003 Elsevier B.V. All rights reserved. Keywords: Mesoporo...

Ngày tải lên: 20/03/2014, 13:07

... temperature, the insert gas, pressure, gas flow, catalyst, etc. – Insert hydrocarbon gas (C 2 H 2 , C 2 H 4 , CH 4 , etc) into quartz tube and obtain Energy  insert gas decomposed and CNT ... • Use Hydrogen gas instead Helium gas Synthesis methods of CNT (cont’) • Laser vaporization – First used Smalley Group in 1995 – Use He or Ar gas and maintain 500 torr – Use laser, va...

Ngày tải lên: 23/10/2013, 19:15

... carbon nanotubes with tin(IV) oxide, Letters to the Editor, Carbon 42 (2004) 3251–3272. [10] B Y.Wei,M C. Hsu, P G.Su,H M. Lin, R J. Wu, H J. Lai, A novel SnO 2 gas sensor doped with carbon nanotubes ... this sensor, the linear fit can be Please cite this article in press as: N. Van Hieu, et al., Gas- sensing properties of tin oxide doped with metal oxides and carbo...

Ngày tải lên: 19/03/2014, 16:48

... damage Mitochondrial swelling was assayed as described by Hunter et al. [33]. Mitochondrial swelling was measured by the decrease in the turbidity of the reaction mixture at 520 nm. The decrease in absorbance ... A60 cm) chro- matography (k ¼ 254 nm) with distilled water as the eluent. The resulting solution was freeze-dried and the lyophilized powder was washed with ethyl ether three...

Ngày tải lên: 19/02/2014, 02:20

... reaction was performed for 30min, 60min and 2h at 37°C and analysed as described [11]. Other methods The DNA topoisomerase, polymerase, ligase, nicking and nuclease activities were performed as described ... contamination with nuclease activity. Fraction III was applied to a phosphocellulose column equilibrated with buffer A. Following washing with buffer A, the bound proteins were...

Ngày tải lên: 20/02/2014, 11:20

... Also measured were concentrations of oxygen, nitrogen, carbon dioxide, mineral oil, and hydrocarbons. The ratio of oxygen to nitrogen was the same as that of air and was different in each measurement ... $/10 6 Btu Slurry, $80/ton carbon Gasoline, Tax Free H2 Production Cost Liquid H2 H2 Gas at 5000psi Range $ 150/ton C $ 50/ton C Figure 11 – Cost of Stored Hydrogen as a Chemical H...

Ngày tải lên: 05/03/2014, 20:20

... the P-O-C-P insert. Lastly, the asymmetric hydrolases accept the P-O-C-P inserts as competitive inhibitors, whereas the bacterial symmetri- cal hydrolase does not. Thus, these novel compounds will ... of enzymatic studies on these novel analogs as potential substrates and/or inhibitors of two asymmetrically acting Ap 4 A hydrolases [bis(5 ¢-nucleosyl)-tetraphos- phatase (asymmetrical)...

Ngày tải lên: 16/03/2014, 04:20

... oxidation was determined by measuring the layer thicknesses. The step height between the aluminum surface and the alumina surface at the edge of the anodized regions was measured with a mechanical ... concentration has been studied, and it was reported that the anodic voltage has a major effect on both pore diameter and distance, i.e., the pore distance in- creases linearly with voltage....

Ngày tải lên: 19/03/2014, 16:48