controlled synthesis and gas sensing properties of hollow sea urchin like

... Sensors and Actuators B 141 (2009) 381–389 is one of the most important parameters of sensors. In addition, the sensing properties of hollow sea urchin- like ␣-Fe 2 O 3 nanostruc- tures and ␣-Fe 2 O 3 nanocubes ... 2009 Keywords: ␣-Fe 2 O 3 Hollow sea urchin- like nanostructure Nanocubes Gas sensors abstract Hollow sea urchin- like ␣-Fe 2 O 3 nanostructure...

Ngày tải lên: 05/05/2014, 15:26

... achieve both of high surface area and large pore volume. 3.4. Gas sensing characteristics As stated above, the gas responses of the R5 and R0.5 powders were negligible. Thus, the gas responses of the ... the effective gas diffusion (Fig. 5). The gas response was improved fur- Fig. 7. Dynamic sensing transients of (a) R30-RH and (b) R30 sensors and (c) gas respo...

Ngày tải lên: 19/03/2014, 16:48

... concentration of NO x gas [6]. However, most reports focused on the NO x gas sensors, and the study of sensing to other gases was rare. In this paper, we have investigated the electrical and gas- sensing characteristics ... sensors to certain control and monitoring. 3.3. Gas- sensing properties In this study, we ®rst examined the eect of calcining temperature on ga...

Ngày tải lên: 19/03/2014, 16:48

... species and make them excellent candidates for gas sensing applications [34,35]. The gas sensing performance X. Shen et al. / Sensors and Actuators B 143 (2009) 325–332 329 Fig. 4. TEM and HRTEM ... absorp- tion band gap energy. Two regions with a linear relationship are observed in the ranges of 3.5–4.2eV and 5.0–6.0 eV, respectively, giving two E g values of 2.77 eV and...

Ngày tải lên: 20/03/2014, 13:04

... the material and gas- sensing properties of room-temperature tungsten oxide nanorod sensors Yong Shin Kim ∗ Department of Applied Chemistry, Hanyang University, Ansan 426-791, Republic of Korea article ... by drop-coating single-crystalline, size -controlled WO 2.72 nanorod solution, and then investigated the dependence of their material and gas- sensing properties on...

Ngày tải lên: 20/03/2014, 13:11

... press as: N. Van Hieu, et al., Gas- sensing properties of tin oxide doped with metal oxides and carbon nanotubes: A competitive sensor for ethanol and liquid petroleum gas, Sens. Actuators B: Chem. ... press as: N. Van Hieu, et al., Gas- sensing properties of tin oxide doped with metal oxides and carbon nanotubes: A competitive sensor for ethanol and liquid petroleum g...

Ngày tải lên: 19/03/2014, 16:48

... et al.rSensors and Actuators B 67 2000 270–274 271 Fig. 1. Change of gas sensitivity with firing temperature. This paper described the effect of NH on gas sensing 3 properties of Pt dispersed-TiO ... highest gas sensitivity and selectivity to H among reducing gases: H , CO and CH . A XRD 224 profile of this thin film indicated the presence of only anatase phase. In c...

Ngày tải lên: 19/03/2014, 16:48

... calcinations are in the range of 30–150 nm. The gas sensing properties of these powders in the form of thick film were investigated with and without platinum doping. Gas response of thick films sintered ... No. of Pages 5 Sensors and Actuators B xxx (2010) xxx–xxx Contents lists available at ScienceDirect Sensors and Actuators B: Chemical journal homepage: www.elsevier.c...

Ngày tải lên: 19/03/2014, 16:48

... the band gap of the In- loaded WO 3 . These energetic levels are the source of added support of charge that changes the sensing properties of the WO 3 -based sensors. 4. Conclusions The gas sensing ... size of active layers is one of the key factors to enhance the gas sensing properties of semiconductor metal oxide sensors [7,8]. Additionally, the inclusion of di...

Ngày tải lên: 19/03/2014, 16:48

... 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