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Белышева, Т. В.; Bogovtseva, L. P.; Kazachkov, E. A.; Serebryakova, N. V.

doi:10.1023/a:1024176505338

Cited by 50 publications

(24 citation statements)

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“…Therefore, when the WO 3 nanorods are exposed to NO 2 gas, NO 2 adsorb directly on the surface of the WO 3 nanorods or reacts with the adsorbed O − (ads) by the following reactions [31,32]:…”

Section: Resultsmentioning

confidence: 99%

Enhanced NO2 gas sensing properties of WO3 nanorods encapsulated with ZnO

Park

et al. 2012

Appl. Phys. A

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The influence of the encapsulation of WO 3 nanorods with ZnO on the NO 2 gas sensing properties was examined. WO 3 -core/ZnO-shell nanorods were fabricated by a two-step process comprising the catalyst-free thermal evaporation of a mixture of WO 3 and graphite powders in an oxidizing atmosphere and atomic layer deposition of ZnO. Multiple networked WO 3 -core/ZnO-shell nanorod sensors showed the response of 281 % at 5 ppm NO 2 at 300°C. This response value was approximately 9 times larger than that of bare WO 3 nanorod sensors at 5 ppm NO 2 . The response values obtained from the WO 3 -core/ZnO-shell nanorods in this study were more than 5 times higher than those obtained previously from the SnO 2 -core/ZnO-shell nanofibers at the same NO 2 concentration range. The significant enhancement in the response of WO 3 nanorods to NO 2 gas by encapsulating them with ZnO can be accounted for based on the space-charge model.

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Section: Resultsmentioning

confidence: 99%

Enhanced NO2 gas sensing properties of WO3 nanorods encapsulated with ZnO

Park

et al. 2012

Appl. Phys. A

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“…This dependence is drastically altered in the current work at high temperature, where the concentration of adsorbed oxygen would be insignificant. Hirschwald transformation occurs at about 200 • C, and desorption of the latter occurs beyond 250 • C [73][74][75][76][77] Based on this fact, the functionality of the semi-conducting metal oxides theoretically should be terminated beyond 300 • C; therefore, the number of semi-conducting oxide sensors discussed in literature that function beyond that temperature are limited. Many of the semi-conducting oxide sensors described in literature lose sensing capability due to desorption of the chemi/physi-adsorbed oxygen along with reduction of the sensing material at elevated temperature.…”

Section: So 2 Sensor Testing Of the Nano-srmoo 4 And Post-mortem Analmentioning

confidence: 99%

Molybdenum and tungsten oxide based gas sensors for high temperature detection of environmentally hazardous sulfur species

Çiftyürek

Sabolsky

2016

Sensors and Actuators B: Chemical

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a b s t r a c tThere is an increasing desire to control and monitor gas emissions from coal-fired power plants and other industrial systems. With this desire, there is a growing need for distributed gas sensors to monitor these emissions at high temperature ( > 600 • C), especially for pollutants such as SO 2 and H 2 S. The objective of this work was to investigate molybdenum and tungsten binary and ternary oxide thick films on a chemiresistive sensor platform for monitoring of gas sulfur species. The work evaluated the SO 2 sensitivity of WO 3 , MoO 3 , SrMoO 4 , NiMoO 4 , Sr 2 MgMoO 6-␦ (SMM), Sr 2 MgWO 6-␦ (SMW), NiWO 4 , and SrWO 4 compositions at 600-1000 • C. The SrMoO 4 composition at both the micro-and nano-particulate scale showed the most promise in sensitivity, stability and selectivity to SO 2 up to 1000 • C. Hydrothermallysynthesized nano-SrMoO 4 showed the highest sensor response with the R max values of −17.2, −50.2 and −40.5 upon exposure to a 20 min pulse of 2000 ppm of SO 2 at 600 • C, 800 • C and 1000 • C, respectively. Similar sensitivity trends were distinguished down to 1-5 min SO 2 pulses. The nano-SrMoO 4 showed low cross-selectivity to H 2 and CO. Finally, the nano-SrMoO 4 sensor was also tested with H 2 and coal syngas containing 5-100 ppm H 2 S, where high sensitivities were realized for both, but the sensing mechanism was altered in the latter (n-type to p-type semiconducting behavior). In order to better understand the sensing mechanism, extensive microstructural, electronic and chemical property characterizations were completed in this work.

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“…The oxygen molecules play consequential role in the sensing mechanism. The oxygen molecules adsorb on the surface and capture the electrons from the conduction band of the semiconductor which leads to its ionosorption in molecular (O − 2 ) and atomic (O − , O 2− ) forms [29]. The adsorption kinematics are explained as follows [30]: …”

Section: (Ads) ) When Thementioning

confidence: 99%

Chemically synthesized PbS Nano particulate thin films for a rapid NO₂ gas sensor

Burungale

Devan

Pawar

et al. 2016

Materials Science-Poland

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Rapid NO 2 gas sensor has been developed based on PbS nanoparticulate thin films synthesized by Successive Ionic Layer Adsorption and Reaction (SILAR) method at different precursor concentrations. The structural and morphological properties were investigated by means of X-ray diffraction and field emission scanning electron microscope. NO 2 gas sensing properties of PbS thin films deposited at different concentrations were tested. PbS film with 0.25 M precursor concentration showed the highest sensitivity. In order to optimize the operating temperature, the sensitivity of the sensor to 50 ppm NO 2 gas was measured at different operating temperatures, from 50 to 200 • C. The gas sensitivity increased with an increase in operating temperature and achieved the maximum value at 150 • C, followed by a decrease in sensitivity with further increase of the operating temperature. The sensitivity was about 35 % for 50 ppm NO 2 at 150 • C with rapid response time of 6 s. T90 and T10 recovery time was 97 s at this gas concentration.

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Cited by 50 publications

References 1 publication

Enhanced NO2 gas sensing properties of WO3 nanorods encapsulated with ZnO

Enhanced NO2 gas sensing properties of WO3 nanorods encapsulated with ZnO

Molybdenum and tungsten oxide based gas sensors for high temperature detection of environmentally hazardous sulfur species

Chemically synthesized PbS Nano particulate thin films for a rapid NO₂ gas sensor

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Untitled

Cited by 50 publications

References 1 publication

Enhanced NO2 gas sensing properties of WO3 nanorods encapsulated with ZnO

Enhanced NO2 gas sensing properties of WO3 nanorods encapsulated with ZnO

Molybdenum and tungsten oxide based gas sensors for high temperature detection of environmentally hazardous sulfur species

Chemically synthesized PbS Nano particulate thin films for a rapid NO2 gas sensor

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Product

Resources

About

Chemically synthesized PbS Nano particulate thin films for a rapid NO₂ gas sensor