01979nas a2200265   4500008004100000022001400041245007500055210006900130260007300199300001000272490000700282520111500289653001401404653001901418653001001437653003001447653000801477653000801485100001901493700001801512700002801530700002501558700002101583856010901604       2010                        eng d  a0039-914000aHighly sensitive and fast responding CO sensor based on Co3O4 nanorods0 aHighly sensitive and fast responding CO sensor based on Co3O4 na  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcAPR  a37-430 v813 a<p>Co3O4 nanorods (diameters similar to 6-8 nm and lengths similar to 20-30 nm) were synthesized for the first time through a simple co-precipitation/digestion method by calcination of cobalt hydroxyl carbonate in air and their CO gas sensing properties were investigated. The Co3O4 nanorods exhibited outstanding gas sensing characteristics such as, higher gas response (similar to 6.55-50 ppm CO gas at 250 degrees C), extremely rapid response (similar to 3-4s), fast recovery (similar to 5-6s), excellent repeatability, good selectivity and lower operating temperature (similar to 250 degrees C). Furthermore, the Co3O4 nanorods are able to detect up to 5 ppm for CO with reasonable sensitivity (similar to 3.32) at an operating temperature 250 degrees C and they can be reliably used to monitor the concentration of CO over the range (5-50 ppm). The experimental results clearly demonstrate the potential of using the Co3O4 nanorods as sensing material in the fabrication of CO sensors. Plausible CO sensing mechanism of the Co3O4 nanorods is also discussed. (C) 2009 Elsevier B.V. All rights reserved.</p>10aCO sensor10aCo3O4 nanorods10aHRTEM10aSemiconductor gas sensors10aXPS10aXRD1 aPatil, Dewyani1 aPatil, Pradip1 aSubramanian, Vijayanand1 aJoy, Pattayil, Alias1 aPotdar, Hari, S.  uhttps://library.ncl.res.in/content/highly-sensitive-and-fast-responding-co-sensor-based-co3o4-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