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      저자 : G.N. Chaudhari (검색결과 2 건)
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        Acetone gas-sensing performance of Sr-doped nanostructured LaFeO_3 semiconductor prepared by citrate sol―gel route

        P.A. Murade,V.S. Sangawar,G.N. Chaudhari,V.D. Kapse,A.U. Bajpeyee 한국물리학회 2011 Current Applied Physics Vol.11 No.3

        Nanocrystalline La_(1-x)Sr_xFeO_3 (x = 0, 0.1, 0.2, 0.3 and 0.4) was prepared by sol―gel citrate method. The structural and microstructural characterization has been carried out with the help of X-ray diffraction (XRD)and transmission electron microscopy (TEM), respectively. XRD studies confirm the formation of LaFeO_3with perovskite phase. Further studies by Fourier transform infrared spectroscopy were also conducted. DC electrical properties of the prepared nanoparticles were studied by D.C. conductivity measurements. The gas-sensing performance of the as-prepared La_(1-x)Sr_xFeO_3 nanoparticles was investigated towards different reducing gases like acetone (CH_3COCH_3), ethanol (C_2H_5OH), hydrogen sulfide (H_2S), hydrogen (H_2) and liquefied petroleum gas (LPG). The nanocrystalline La_0.7Sr_0.3FeO_3 exhibited good sensing performance towards acetone gas with rapid response and high sensitivity at 275 ℃ as compared with LaFeO_3.

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        Studies on the preparation and ethanol gas sensing properties of spinel Zn0.6Mn0.4Fe2O4 nanomaterials

        A.V. Kadu,S.V. Jagtap,G.N. Chaudhari 한국물리학회 2009 Current Applied Physics Vol.9 No.6

        Zn1-xMnxFe2O4 (x = 0, 0.2 and 0.4) nanomaterials were synthesized by sol–gel citrate method and studied structural and gas sensing properties. The structural characteristics of synthesized nanomaterials were studied by X-ray diffraction measurement (XRD) and transmission electron microscope (TEM). The results revealed that the particle size is in the range of 30–35 nm for Mn–Zn ferrite with good crystallinity. The gas sensing properties were studied towards reducing gases like LPG, CH4, CO and ethanol and it is observed that Mn–Zn ferrite shows high response to ethanol at relatively lower operating temperature. The Zn0.6Mn0.4Fe2O4 nanomaterial shows better sensitivity towards ethanol at an operating temperature 300 ℃. Incorporation of 1.5 wt.% Pd improved the sensitivity, selectivity, response time and reduced the operating temperature from 300 ℃ to 230 ℃ for ethanol sensor. The response time of 200 ppm ethanol in air is about 10s. Zn1-xMnxFe2O4 (x = 0, 0.2 and 0.4) nanomaterials were synthesized by sol–gel citrate method and studied structural and gas sensing properties. The structural characteristics of synthesized nanomaterials were studied by X-ray diffraction measurement (XRD) and transmission electron microscope (TEM). The results revealed that the particle size is in the range of 30–35 nm for Mn–Zn ferrite with good crystallinity. The gas sensing properties were studied towards reducing gases like LPG, CH4, CO and ethanol and it is observed that Mn–Zn ferrite shows high response to ethanol at relatively lower operating temperature. The Zn0.6Mn0.4Fe2O4 nanomaterial shows better sensitivity towards ethanol at an operating temperature 300 ℃. Incorporation of 1.5 wt.% Pd improved the sensitivity, selectivity, response time and reduced the operating temperature from 300 ℃ to 230 ℃ for ethanol sensor. The response time of 200 ppm ethanol in air is about 10s.

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