02396nas a2200253   4500008004100000022001400041245007600055210006900131260006900200300001200269490000800281520158200289653002501871653001001896653001501906653003001921653000801951653000801959653000801967100001901975700002001994700001802014856011002032       2011                        eng d  a0925-400500aHighly sensitive and selective LPG sensor based on alpha-Fe2O3 nanorods0 aHighly sensitive and selective LPG sensor based on alphaFe2O3 na  aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcMAR  a299-3060 v1523 a<p>The alpha-Fe2O3 nanorods were successfully synthesized without any templates by calcining the alpha-FeOOH precursor in air at 300 degrees C for 2 h and their LPG sensing characteristics were investigated. The alpha-FeOOH precursor was prepared through a simple and low cost wet chemical route at low temperature (40 degrees C) using FeSO4 center dot 7H(2)O and CH3COONa as starting materials. The formation of alpha-FeOOH precursor and its topotactic transformation to alpha-Fe2O3 upon calcination was confirmed by X-ray diffraction measurement (XRD). X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) analysis. The alpha-Fe2O3 nanorods exhibited outstanding gas sensing characteristics such as, higher gas response (similar to 1746-50 ppm LPG at 300 degrees C), extremely rapid response (similar to 3-4 s), relatively slow recovery (similar to 8-9 min), excellent repeatability, good selectivity and lower operating temperature (similar to 300 degrees C). Furthermore, the alpha-Fe2O3 nanorods are able to detect up to 5 ppm for LPG with reasonable response (similar to 15) at the operating temperature of 300 degrees C and they can be reliably used to monitor the concentration of LPG over the range (5-60 ppm). The experimental results clearly demonstrate the potential of using the alpha-Fe2O3 nanorods as sensing material in the fabrication of LPG sensors. Plausible LP G sensing mechanism of the alpha-Fe2O3 nanorods is also discussed. (C) 2010 Elsevier B.V. All rights reserved.</p>10aalpha-Fe2O3 nanorods10aFESEM10aLPG sensor10aSemiconductor gas sensors10aTEM10aXPS10aXRD1 aPatil, Dewyani1 aPatil, Virendra1 aPatil, Pradip  uhttps://library.ncl.res.in/content/highly-sensitive-and-selective-lpg-sensor-based-alpha-fe2o3-nanorods-002164nas a2200253   4500008004100000022001400041245005900055210005900114260006900173300001200242490000800254520136200262653001001624653001501634653002701649653003001676653000801706100002801714700002501742700002101767700001901788700001801807856008501825       2011                        eng d  a0925-400500aNanostructured spinet ZnCo2O4 for the detection of LPG0 aNanostructured spinet ZnCo2O4 for the detection of LPG  aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcFEB  a121-1290 v1523 a<p>Nanostrucutred spinel ZnCo2O4 (similar to 26-30 nm) was synthesized by calcining the mixed precursor (consisting of cobalt hydroxyl carbonate and zinc hydroxyl carbonate) in air at 600 degrees C for 5 h. The mixed precursor was prepared through a low cost and simple co-precipitation/digestion method. The transformation of the mixed precursor into nanostructured spinel ZnCO2O4 upon calcinations was confirmed by X-ray diffraction (XRD) measurement, thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS) and high resolution transmission electron microscopy (HRTEM). To demonstrate the potential applicability of ZnCo2O4 spinel in the fabrication of gas sensors, its LPG sensing characteristics were systematically investigated. The ZnCo2O4 spinel exhibited outstanding gas sensing characteristics such as, higher gas response (similar to 72-50 ppm LPG gas at 350 degrees C), response time (similar to 85-90 s), recovery time (similar to 75-80 s), excellent repeatability, good selectivity and relatively lower operating temperature (similar to 350 degrees C). The experimental results demonstrated that the nanostructured spinel ZnCo2O4 is a very promising material for the fabrication of LPG sensors with good sensing characteristics. Plausible LPG sensing mechanism is also discussed. (c) 2010 Elsevier B.V. All rights reserved.</p>10aHRTEM10aLPG sensor10aNanostructured ZnCo2O410aSemiconductor gas sensors10aXPS1 aVijayanand, Subramanian1 aJoy, Pattayil, Alias1 aPotdar, Hari, S.1 aPatil, Dewyani1 aPatil, Pradip  uhttps://library.ncl.res.in/content/nanostructured-spinet-znco2o4-detection-lpg-0