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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.
Characteristics of high sensitivity ethanol gas sensors based on nanostructured spinel Zn1−xCoxAl2O4
S.D. Kapse,F.C. Raghuwanshi,V.D. Kapse,D.R. Patil 한국물리학회 2012 Current Applied Physics Vol.12 No.1
Nanocrystalline powders of Zn1-xCoxAl2O4 (x ¼ 0, 0.2, 0.4, 0.6, 0.8, 1.0) mixed oxides, with cubic spinel structure were successfully prepared by the ethylene glycol mediated citrate sol-gel method. The structure and crystal phase of the powders were characterized by X-ray diffraction (XRD) and microstructure by transmission electron microscopy (TEM). X-ray diffraction results showed that the samples were in single phase with the space group Fd-3m. TEM analysis showed that the powders with spherical shape were uniform in particle size of about 17e24 nm with mesoporous in nature. Further investigations were carried out by FT-IR. Thick films of as-prepared Zn1-xCoxAl2O4 powders were fabricated using screen-printing technique. The response of Zn1-xCoxAl2O4 based thick films towards different reducing gases (liquefied petroleum gas, hydrogen, hydrogen sulfide, ethanol gas and ammonia) was investigated. The sensor response largely depends on the composition, temperature and the test gas species. The Co (cobalt) content has a considerable influence on the gas-sensing properties of Zn1-xCoxAl2O4. Especially,Zn0.4Co0.6Al2O4 composition exhibited high response with better selectivity to 100 ppm C2H5OH gas at 150 ℃. The instant response (w7 s) and fast recovery (w16 s) are the main features of this sensor. Nanocrystalline powders of Zn1-xCoxAl2O4 (x ¼ 0, 0.2, 0.4, 0.6, 0.8, 1.0) mixed oxides, with cubic spinel structure were successfully prepared by the ethylene glycol mediated citrate sol-gel method. The structure and crystal phase of the powders were characterized by X-ray diffraction (XRD) and microstructure by transmission electron microscopy (TEM). X-ray diffraction results showed that the samples were in single phase with the space group Fd-3m. TEM analysis showed that the powders with spherical shape were uniform in particle size of about 17e24 nm with mesoporous in nature. Further investigations were carried out by FT-IR. Thick films of as-prepared Zn1-xCoxAl2O4 powders were fabricated using screen-printing technique. The response of Zn1-xCoxAl2O4 based thick films towards different reducing gases (liquefied petroleum gas, hydrogen, hydrogen sulfide, ethanol gas and ammonia) was investigated. The sensor response largely depends on the composition, temperature and the test gas species. The Co (cobalt) content has a considerable influence on the gas-sensing properties of Zn1-xCoxAl2O4. Especially,Zn0.4Co0.6Al2O4 composition exhibited high response with better selectivity to 100 ppm C2H5OH gas at 150 ℃. The instant response (w7 s) and fast recovery (w16 s) are the main features of this sensor.