highly sensitive thin film nh3 gas sensor operating at room

... A vailable online at www.sciencedirect.com Sensors and Actuators B 129 (2008) 888–895 Highly sensitive thin film NH 3 gas sensor operating at room temperature based on SnO 2 /MWCNTs ... composite sensors still operate at elevated tempera- tures. To the best of our knowledge, it seems that experimental data on SnO 2 /CNTs composite-based gas sensors operated at room te...

Ngày tải lên: 19/03/2014, 16:48

Ngày tải lên: 19/03/2014, 16:48

... properties at room tem- perature were studied. The ultimate objective of this study is to improve the gas selectivity and sensitivity of the nano-sized ZnO-based sensors at room temperature. 2. ... Jones, The role of catalysis in solid-state gas sensors, Sens. Actuators B 10 (1986) 141–163. [16] B. Bhooloka Rao, Zinc oxide ceramic semi-conductor gas sensor for ethanol vapour,...

Ngày tải lên: 19/03/2014, 16:47

... al. / Sensors and Actuators B 119 (2006) 327–334 329 For the diatomic gases as oxygen, the adsorption may be non-dissociative (generally at low temperature) or dissociative (at higher temperature). ... values, what highlights the greatest reactivity of the ozone compared to the oxygen. 4.3. Simulation in presence of the two gases at operating conditions Now, the sensors response are s...

Ngày tải lên: 20/03/2014, 13:04

... 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 superior to those prepared at other temperatures ... 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...

Ngày tải lên: 20/03/2014, 13:04

... 270–274272 Table 2 Ž. Relative resistance of the thin film fired in different atmosphere measured at 2008C Number Firing atmosphere Kind of thin film Kind of measuring gas Relative resistance 1a NH ... TiO 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 thic...

Ngày tải lên: 19/03/2014, 16:48

... 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 ... many applications if the sensor could operate at temperatures <100 ◦ C or even at room temperature, es- pecially for battery-operated devices. Recently it also has been reported...

Ngày tải lên: 20/03/2014, 13:07

... Sens. Actuators B 133 (2008) 46-52.10 35. D.R. Patil, L.A. Patil, P.P. Patil, Cr 2 O 3 -activated ZnO thick film resistors for ammonia gas 11 sensing operable at room temperature, Sens. Actuators ... 12 maintained at room temperature. Fig.6a shows the response of the four sensors to 150 ppm NH 3 gas 13 at room temperature. From Fig. 6b, it can be seen that the optimal anneal...

Ngày tải lên: 20/03/2014, 13:11

... tolerance. This situation is better in the case of novel gas sensors based on metal oxides that are stable at high temperatures, so permitting an operating Materials Characterization 58 (2007) 680 ... respect to the ammonia gas concentrations at an operating temperature of 250 °C. It was found that the sensitivity factor increases with increasing gas concentration. The repeatabi...

Ngày tải lên: 20/03/2014, 13:11

... film deposition at room temperature. The sputtering atmosphere consisted of Ar–O 2 mixed gas and its flow rate was controlled by separate gas flowmeters to provide an Ar:O 2 flow ratio of 1:1. The pressure ... Sensors and Actuators B 109 (2005) 128–134 New technology of metal oxide thin film preparation for chemical sensor application Viacheslav Khatko a,∗ , Josep Calderer b , ... ammo...

Ngày tải lên: 20/03/2014, 13:05