tio2 thin film gas sensor for monitoring ammonia

... 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 ... widely used materials for thin film- based conductometric gas sensors. The mechanistic steps responsible for the gas- induced conductance changes of polycr...

Ngày tải lên: 20/03/2014, 13:11

... improve the performance of the gas sensor based on the PANI/TiO 2 nanocomposite thin film and develop a usable NH 3 gas sensor, the polymerization tem- perature was systematically optimized for film processing ... fabrication of gas sensors for detection of gaseous chemicals. Choice of suitable sensing materials along with efficient microelectronics for the detection system is t...

Ngày tải lên: 20/03/2014, 13:04

... 2. XRD profiles for the TiO thin film fired in 3% H rAr or NH . 223 () I. Hayakawa et al.rSensors and Actuators B 67 2000 270–274 273 Fig. 3. SIMS profiles for the TiO –Pt thin film fired in 3% ... are promising materials for gas sensor 1 . 2 TiO has been mainly studied as a material of O 22 sensor at high temperature as high as 8008C in the form of wx bulk or thick film...

Ngày tải lên: 19/03/2014, 16:48

... environmental monitoring is below 100 ppm (even much lower for dissolved ammonia) , BCP is practically useless for that sensor purposes. The response time and reversibility of these sensors were ... found, that sensors prepared on different oxide layers with the same indicator, show different signal change in the presence of the same concentration of ammonia gas. Sensors with opti...

Ngày tải lên: 20/03/2014, 13:06

... sensitive layer has a great influence on the gas- sensing performance of thin film sen- sors, which has provided a much better platform to produce high performance gas sensors [44–49]. In this work, we also ... 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 [4...

Ngày tải lên: 19/03/2014, 16:48

... 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 grain ... mi- cromachined gas sensors, in: Proceedings of the 16th European Con- ference on Solid State Transducers EUROSENSORS XVI, Prague, 2002, pp. 257–258. [10] S.R. Morrison, Semiconductor...

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 ;NO 2 gas sensor; Sol–gel process 1. Introduction The detection of NO 2 is important for monitoring environ- mental pollution resulting from combustion or automotive emissions...

Ngày tải lên: 20/03/2014, 13:07

... respectively [5]. Therefore, a NO x sensor requires high sensitivity for detecting low concentration of gases. Another enormous driving force for developing high sensitivity NO x sensor comes from automotive ... Inorganic Chemistry, Oxford Science Publications, Oxford, 1987, pp. 569±574. [14] G. Sberveglieri, L. Depero, S. Groppelli, P. Nelli, WO 3 sputtered thin films for NO x m...

Ngày tải lên: 19/03/2014, 16:47

... 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 ammonia gas ... Experimental set-up used for the analysis of NH 3 vapors and (b) schematic drawing of the ammonia gas sensor. 2. Experimental 2.1. Fabrication of gas sensors The gas senso...

Ngày tải lên: 19/03/2014, 16:47

... 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 remains an important ... to form printable ink. The ink was deposited on sensor microheater platform, dried for 15 min at 150 ◦ C and annealed at 700 ◦ C for 15 min to reach the stabilization of the material...

Ngày tải lên: 19/03/2014, 16:47