01461nas a2200193   4500008004100000022001400041245006200055210006100117260008100178300001400259490000700273520079500280100001401075700002001089700001701109700002001126700002501146856009601171       2005                        eng d  a0002-782000aNovel low-temperature synthesis of nanosized NiZn ferrite0 aNovel lowtemperature synthesis of nanosized NiZn ferrite  a9600 GARSINGTON RD, OXFORD OX4 2DQ, OXON, ENGLANDbBLACKWELL PUBLISHINGcSEP  a2597-25990 v883 a<p>Nanosized NiZn ferrite powder is synthesized by a low-temperature method, using a unique combination of citric acid and glycine. An appropriate molar ratio of both citric acid and glycine offers a low-temperature synthetic route by incorporating the complexation behavior of citric acid and the combustion nature of glycine. Thermal decomposition/controlled autocatalytic combustion of the composite gel occurs at a low temperature of around 175 degrees C, with the evolution of a large amount of gases. Transmission electron microscopic studies showed that the average particle size of the ferrite obtained is similar to 2.5 nm, with a narrow size distribution. Uniformly distributed fine-grained microstructure with low porosity is obtained for a sample sintered at 1000 degrees C.</p>1 aVerma, S.1 aPradhan, S., D.1 aPasricha, R.1 aSainkar, S., R.1 aJoy, Pattayil, Alias  uhttps://library.ncl.res.in/content/novel-low-temperature-synthesis-nanosized-nizn-ferrite-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