gas sensing properties of nanocrystalline tungsten oxide synthesized by acid

... 800 ◦ C) response for to 4000 ppm NH 3 gas. Please cite this article in press as: T.D. Senguttuvan, et al., Gas sensing properties of nanocrystalline tungsten oxide synthesized by acid precipi- tation method, ... ammonia gas sensing prop- erties of nanocrystalline tungsten oxide with and withoutplatinum doping under different processing conditions. 2. Experim...

Ngày tải lên: 19/03/2014, 16:48

... image of an MWCNTs-doped SnO 2 sol (c); FE-SEM image of an MWCNTs-doped SnO 2 (d). Please cite this article in press as: N. Van Hieu, et al., Gas- sensing properties of tin oxide doped with metal oxides ... 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 petroleu...

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 ... stability is of signi®cance to apply the sensors to certain control and monitoring. 3.3. Gas- sensing properties In this study, we ®rst examined the e...

Ngày tải lên: 19/03/2014, 16:48

... 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 derived from precursor. 2 2. ... is explained by the effect of encapsulation or decoration of the metal by the reduced support or electronic interaction of the reduced support with the metal. SM...

Ngày tải lên: 19/03/2014, 16:48

... 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 differ- ent doping metals in the sensing ... 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...

Ngày tải lên: 19/03/2014, 16:48

... discussion Fig. 1 shows SEM images of the sensing films deposited by screen printing. The sensing film exhibited the typical microstruc- ture of screen printed sensing films. A porous sensing film surface was ... evident, the inner morphological properties of the sensing film were affected by the WO 3 doping. Fig. 3 revealed that the sensing films consisted of al- most a s...

Ngày tải lên: 19/03/2014, 16:48

... 2009 Available online xxx Keywords: Nitrogen dioxide Ammonia Gas- sensing properties PbS Sensor abstract In the present paper, the gas- sensing characteristics of novel gas sensors based on PbS were investigated. The ... harmful gases. Nitrogen dioxide is created by the high temper- ature combustion of coal, chemical production, natural gas or oil in power plants and also b...

Ngày tải lên: 20/03/2014, 13:06

... preparation of soluble and highly crystalline tungsten oxide nanorods of varying sizes by a mild, solution-based colloidal approach. A stirred slurry of 0.70 g of W(CO) 6 (Strem, 99%), 1.33 g of Me 3 NO‚2H 2 O ... been accomplished by heating a tungsten foil, covered by SiO 2 plate, in an argon atmosphere at 1600 °C 17 or recently by electrochemically etching a tungst...

Ngày tải lên: 20/03/2014, 13:08

... semiconductor gas sensor based on nonstoichiometric tungsten oxide nanorod film, Appl. Phys. Lett. 86 (2005) 213105. [12] Y. S. Kim, K. Lee, Material and gas- sensing properties of tungsten oxide nanorod thin-films, ... material and gas- sensing properties of room-temperature tungsten oxide nanorod sensors Yong Shin Kim ∗ Department of Applied Chemistry, Hanyang Un...

Ngày tải lên: 20/03/2014, 13:11

... hydrothermal system. To the best of our knowledge, this is the first report of the selective synthesis of ␣-Fe 2 O 3 superstructures and nanocubes. The gas- sensing properties of the ␣-Fe 2 O 3 superstructures, ... reducing gas to the n-type semiconductors [35]. So, logarithm of the response should be lin- ear with logarithm of gas concentration. Fig. 7b–f displays chart...

Ngày tải lên: 05/05/2014, 15:26