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-0