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RISS 인기검색어
- 검색키워드
- 저자 : Shendage, S.S. (검색결과 2 건)
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NO<sub>2</sub> sensing properties of porous fibrous reticulated WO<sub>3</sub> thin films
Shendage, S.S.,Patil, V.L.,Patil, S.P.,Vanalakar, S.A.,Bhosale, J.L.,Kim, J.H.,Patil, P.S. ELSEVIER 2017 JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS Vol.125 No.-
<P><B>Abstract</B></P> <P>In this work, the WO<SUB>3</SUB> thin films were synthesized onto glass substrates at 673K by simple and cost-effective spray pyrolysis technique for the NO<SUB>2</SUB> gas sensing. Moreover, the WO<SUB>3</SUB> thin film was synthesized as a function of different spray solution concentration. The structural and morphological results reveal the polycrystalline nature of WO<SUB>3</SUB> thin films with pure monoclinic phase having porous fibrous reticulate morphology. The optical band gaps of WO3 thin films were observed ∼2.73eV. Moreover, the activation energy in our WO<SUB>3</SUB> sample (0.368eV) is maximum than the theoretical value of activation energy (0.031eV). Due to the outstanding morphology and grater activation energy, the WO<SUB>3</SUB> thin films were used for NO<SUB>2</SUB> gas sensing. The gas sensing properties of the thin film sensor based on WO<SUB>3</SUB> thin films were studied in the range of 1–100ppm of the NO<SUB>2</SUB> at an operating temperature of 423K (or 150°C). The sensor exhibits better gas response around 5.75 for 5ppm of NO<SUB>2</SUB> gas as well as 84.75 for 100ppm NO<SUB>2</SUB> gas with better selectivity.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Porous reticulated fibrous morphology of WO<SUB>3</SUB> were synthesized via the simplistic chemical route. </LI> <LI> The nano-fibrous of WO<SUB>3</SUB> exhibited excellent and highly selective gas response ∼5.75 for 5ppm of NO<SUB>2</SUB> gas. </LI> <LI> The synthesis route and sensing behavior of as synthesized WO<SUB>3</SUB> revealed a promising candidate for fabricating low-consumption gas sensors. </LI> </UL> </P>
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Sensitive and selective NO<sub>2</sub> gas sensor based on WO<sub>3</sub> nanoplates
Shendage, S.S.,Patil, V.L.,Vanalakar, S.A.,Patil, S.P.,Harale, N.S.,Bhosale, J.L.,Kim, J.H.,Patil, P.S. Elsevier Sequoia 2017 Sensors and actuators. B, Chemical Vol.240 No.-
Gas sensors based on a chemiresistive metal oxide semiconductor are widely used including nitrogen dioxide (NO<SUB>2</SUB>) at a moderate temperature. In this work efforts are taken to fabricate NO<SUB>2</SUB> gas sensor using thin films of tungsten oxide (WO<SUB>3</SUB>) grown directly on to a soda-lime glass substrate without assistance of any seed layer by a simple and a facile hydrothermal technique. As per our knowledge, the deposition of nanostructured WO<SUB>3</SUB> thin films without assistance of any seed layer on the glass substrate was rarely reported. The WO<SUB>3</SUB> thin film samples were synthesized at various deposition times ranging from 3h to 7h and were characterized by X-ray diffraction, Raman spectroscopy, field emission scanning electron microscopy, transmission electron microscopy, UV-vis spectroscopy and Brunauer-Emmett-Teller techniques. The surface morphological and structural characterization showed the two dimensional (2D) nanoplate-like structure of as synthesized WO<SUB>3</SUB> thin films with plate thickness ranging from 90 to 150nm and had an orthorhombic structure, respectively. Moreover, the 2D nanoplates of WO<SUB>3</SUB> exhibited a gas response ~10 for 5ppm for toxic NO<SUB>2</SUB> gas at relatively low operating temperature. The new synthesis route and sensing behavior of as synthesized WO<SUB>3</SUB> nanoplates revealed a promising candidate for the fabrication of the cost effective gas sensors.
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