thin film polypyrrole swcnts nanocomposites-based nh3 sensor

... The thin film and the porous film could be the reasons explaining why the 3 PPY /SWCNTs composite-based sensor exhibits a higher response compared to that of PPY-based 4 sensors. Additionally, SWCNTs ... PPY /SWCNTs composite sensor depends on the reactivity and 2 diffusion of NH 3 gas molecules inside the composite-sensing thin film. Therefore, when the 3 thickness of the f...

Ngày tải lên: 20/03/2014, 13:11

... performance of the gas sensor at low operating temperature. However, the SWCNTs- doped SnO 2 sensor behaves as an n-type semiconductor, while our MWCNTs/SnO 2 composite sensor behaves as a p-type ... MWCNTs/SnO 2 composite is too thin, the response will be decreased. Such gas-response dependent on the thickness of the composite MWCNTs/SnO 2 thin film sensor has not been clear so fa...

Ngày tải lên: 19/03/2014, 16:48

... reported a PANI/TiO 2 nanocompos- ite thin film gas sensor prepared at room temperature [10].It has been revealed that the PANI/TiO 2 nanocomposite thin film gas sensor exhibited higher response values, ... polymerization temperature on the gas response of the PANI/TiO 2 thin film gas sensor was investigated. The results showed that the PANI/TiO 2 thin film prepared at 10 ◦ C was su...

Ngày tải lên: 20/03/2014, 13:04

... of the thin films was about 70 nm. The gas sensitivity of the thin film with Ag electrode was almost the same as that with Au electrode. However, Au electrode was easily torn from thin film. Therefore, ... the film fired at 4508C. The thin film fired at 4508C proved to have the highest gas sensitivity and selectivity to H among reducing gases: H , CO and CH . A XRD 224 profile...

Ngày tải lên: 19/03/2014, 16:48

... Sensors and Actuators B 119 (2006) 327–334 Review Modeling of the conduction in a WO 3 thin film as ozone sensor J. Gu ´ erin ∗ , K. Aguir, M. Bendahan L2MP ... experimental sensor. Fig. 8. Simulation of the response of the layer vs. ozone temperature at 0.8 ppm ozone in the two adsorption cases and comparison with an experimental sensor. obtained with aWO 3 sensor ... Comparison bet...

Ngày tải lên: 20/03/2014, 13:04

... Sensors and Actuators B 109 (2005) 128–134 New technology of metal oxide thin film preparation for chemical sensor application Viacheslav Khatko a,∗ , ... direction includes the technologies via with thin films of nanometer grain size can be deposited. As a rule, these technologies are used to obtain thin film gas sensors. For example, active layers with ... mi- cromachined gas sensors,...

Ngày tải lên: 20/03/2014, 13:05

... of WO 3 thin film gas sensors. Part 1. Thin film devices, sensors and actuators, Thin Solid Films 287 (1996) 258–265. [7] V. Demarne, A. Grisel, An integrated low-power thin film CO gas sensors ... WO 3 thin films. These sensors have been reported to have good selectivity for low concentration NO x gas [12]. In this study, we developed a novel NO 2 gas sensors based on mesoporous WO 3...

Ngày tải lên: 20/03/2014, 13:07

... time of the TiO 2 thin film gas sensor was studied for sensing ammonia. © 2006 Elsevier Inc. All rights reserved. Keywords: TiO 2 ; Thin films; Gas Sensor; Sputtering; Ammonia sensor 1. Introduction There ... deposition of TiO 2 films using DC magnetron sputtering and the characterization of the films for gas sensing applications. 2. Experimental 2.1. Film preparation Titanium ox...

Ngày tải lên: 20/03/2014, 13:11

... characteristics of the thin film sensor to trimethylamine were measured. A low-temperature, high sensitivity, excellent selectivity, quick response and recover of thin film sensors to trimethylamine ... WO 3 thin film sensor is very sensi- tive to TMA at 50–85 ◦ C, but not sensitive to NH 3 , gasoline, C 2 H 5 OH, CH 4 and CO and water vapor. These results in- dicate that the WO 3 thi...

Ngày tải lên: 20/03/2014, 13:12

... WO 3 thin films is electrochromic devices based on electrochromism, in which optical properties WO 3 alter reversibly under electrical bias applied [1-3]. Moreover, recently WO 3 thin films ... 12 March 2009 Abstract. Tungsten oxide film was deposited on ITO-coated glass by using RF magnetron sputtering method from WO 3 ceramic target. Thin film preparation – process took pl...

Ngày tải lên: 13/02/2014, 03:20