02200nas a2200229 4500008004100000022001400041245009100055210006900146260007300215300001400288490000700302520140100309653001401710653001501724653001901739653002201758653000801780100002401788700001901812700002201831856011701853 2008 eng d a0039-914000aControlled synthesis of ZnO from nanospheres to micro-rods and its gas sensing studies0 aControlled synthesis of ZnO from nanospheres to microrods and it aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcJUN a1315-13190 v753 a

1D ZnO rods are synthesized using less explored hydrazine method. Here we find, besides being combustible hydrazine can also be used as a structure-directing agent. The ratio of zinc nitrate (ZN) to hydrazine is found to control the morphology of ZnO. At lower concentration of ZN as compared with hydrazine the morphology of ZnO is found to be spherical. As we increase the hydrazine content the morphology changes from spherical (diameter similar to 100 nm) to the elongated structures including shapes like Y, T as well dumbbell (diameter similar to 40 nm and length similar to 150 nm). Interestingly for more than 50% of hydrazine ZnO micro-rods are formed. Such rods are of diameter similar to 120 mn having length of about 1 mu m for ZN to hydrazine ratio of 1:9, isolated as well as bundle of rods are seen in scanning electron microscopy (SEM). The X-ray diffraction (XRD) reveals the phase formation with average particle size of 37 nm as calculated using Scherrer's formula. The high-resolution transmission electron microscopy (HRTEM) is also done to confirm the d-spacing in ZnO. Gas sensing study for these samples shows high efficiency and selectivity towards LPG at all operating temperatures. Photoluminescence (PL) study for these samples is performed at room temperature to find potential application as photoelectric material. (C) 2008 Elsevier B.V. All rights reserved.

10aHydrazine10aLPG sensor10aNanostructures10aphotoluminescence10aZnO1 aNavale, Shalaka, C.1 aGosavi, S., W.1 aMulla, Imtiaz, S. uhttps://library.ncl.res.in/content/controlled-synthesis-zno-nanospheres-micro-rods-and-its-gas-sensing-studies-001863nas a2200217 4500008004100000022001400041245006600055210006600121260006900187300001200256490000800268520113400276653001501410653001601425653002101441653001401462100002801476700002501504700002201529856009401551 2008 eng d a0925-400500aInfluence of Pd doping on morphology and LPG response of SnO20 aInfluence of Pd doping on morphology and LPG response of SnO2 aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcMAY a665-6720 v1313 a

In the present study nanocrystalline pristine and Pd-doped SnO2 (Pd:SnO2) with various mol% Pd have been synthesized by a modified Pechini citrate route. Transmission electron microscopy and X-ray powder diffraction studies were used to characterize the morphology, crystallinity, and structure of the SnO2 and Pd:SnO2. The response of the pristine SnO2 and Pd:SnO2 was studied towards different reducing gases. The 1.5 mol% Pd doping showed an enhanced response of 75 and 95% towards LPG at as low as 50 and 100 degrees C, respectively, which were quite large high value as compared with pristine SnO2 (38 and 35% at 50 and 100 degrees C, respectively). Structural characterization revealed that Pd doping reduced the crystallite size of SnO2 and helps in the formation of distinct spherical nanospheres at a calcinations temperature of 500 degrees C. Thus the increase in LPG response can be correlated with the spherical morphology, a decrease in the crystallite size (11 nm) due to doping with Pd as compared with the pristine SnO2 (26 nm) and main role of Pd as a catalyst. (c) 2008 Elsevier B.V. All rights reserved.

10aLPG sensor10ananospheres10apalladium doping10atin oxide1 aVaishampayan, Mukta, V.1 aDeshmukh, Rupali, G.1 aMulla, Imtiaz, S. uhttps://library.ncl.res.in/content/influence-pd-doping-morphology-and-lpg-response-sno2-001740nas a2200229 4500008004100000022001400041245007800055210006900133260006900202300001200271490000800283520096700291653001601258653001901274653001501293653001801308653001401326100002401340700001301364700002201377856011101399 2009 eng d a0925-400500aInvestigations on Ru doped ZnO: strain calculations and gas sensing study0 aInvestigations on Ru doped ZnO strain calculations and gas sensi aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcJUN a466-4700 v1393 a

Pure and ruthenium (Ru) doped nano-crystalline zinc oxide (ZnO) powders were synthesized by using well-known citrate gel route. Citric acid acts as a chelating agent and thus helps in the formation of nanoparticles. The detailed X-ray diffraction (XRD) studies using Hall equation reveal that in the nanoscale dimensions, incorporation of Ru modulates the lattice strain. It is interesting to note that on Ru doping, the compressive strain present in the undoped ZnO changes into tensile strain. We have tested the response of these specimens individually for reducing gases like H(2), LPG (liquefied petroleum gas), C(2)H(5)OH (ethanol), CO, acetone and oxidizing gases like NO, and Cl(2). Undoped ZnO responses perceptibly to LPG while Ru doped sample highly senses ethanol vapors. This might be due to either change in composition on Ru doping or/and difference between basicity of LPG and C(2)H(5)OH vapors. (C) 2009 Elsevier B.V. All rights reserved.

10aCitrate gel10aEthanol sensor10aLPG sensor10aNanomaterials10aruthenium1 aNavale, Shalaka, C.1 aRavi, V.1 aMulla, Imtiaz, S. uhttps://library.ncl.res.in/content/investigations-ru-doped-zno-strain-calculations-and-gas-sensing-study-001919nas a2200217 4500008004100000022001400041245008900055210006900144260006900213300001200282490000800294520115200302653001101454653001201465653001501477653002601492653001901518100002501537700002201562856011701584 2010 eng d a0254-058400aInfluence of palladium on gas-sensing performance of magnesium ferrite nanoparticles0 aInfluence of palladium on gassensing performance of magnesium fe aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcJAN a319-3230 v1193 a

Commercial ferrites with high densities are mostly used in the electromagnetic devices, which require high temperature synthesis. In this article the gas-sensing characteristics of pure and Pd-doped MgFe(2)O(4) powder has been discussed. The synthesis has been carried out by using a simple molten salt method. This method facilitates rapid synthesis at comparatively lower temperature enabling formation of nanostructures, suitable for the gas-sensing application. Various physicochemical techniques have been used for the characterization of samples. X-ray diffraction analysis confirmed the single-phase formation of pure and Pd-doped MgFe(2)O(4) having crystallite size 15-20 nm. Pure MgFe(2)O(4) showed highest responses towards liquid petroleum gas (LPG) at 350 degrees C while, on doping with Pd the highest response shifted towards lower operating temperature of similar to 200 degrees C. Pure MgFe(2)O(4) exhibited some response towards 200 ppm of LPG which markedly increased on doping of palladium (Pd). The probable mechanism is proposed to explain the selective response towards LPG. (C) 2009 Elsevier B.V. All rights reserved.

10aDoping10aFerrite10aLPG sensor10aMolten salt synthesis10aNanostructures1 aDarshane, Sonali, L.1 aMulla, Imtiaz, S. uhttps://library.ncl.res.in/content/influence-palladium-gas-sensing-performance-magnesium-ferrite-nanoparticles-001856nas a2200229 4500008004100000022001400041245007900055210006900134260009900203300001400302490000700316520106100323653001501384653001401399653000901413653001501422100001801437700001801455700002201473700002401495856010701519 2012 eng d a0272-884200aInfluence of Pd-loading on gas sensing characteristics of SnO2 thick films0 aInfluence of Pdloading on gas sensing characteristics of SnO2 th aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLANDbELSEVIER SCI LTDcAUG a4835-48440 v383 a

Nanocrystalline pristine and 0.5, 1.5 and 3.0 wt% Pd loaded SnO2 were synthesized by a facile co-precipitation route. These powders were screen-printed on alumina substrates to form thick films to investigate their gas sensing properties. The crystal structure and morphology of different samples were characterized by using X-ray diffraction, scanning electron microscopy and transmission electron microscopy techniques. The 3.0 wt% Pd:SnO2 showed response of 85% toward 100 ppm of LPG at operating temperature of 250 degrees C with fast response (8 s) and quick recovery time (24 s). The high response toward LPG on Pd loading can be attributed to lowering of crystallite size (9 nm) as well as the role of Pd particles in exhibiting spill-over mechanism on the SnO2 surface. Also selectivity of 3.0 wt% Pd:SnO2 toward LPG was confirmed by measuring its response to other reducing gases like acetone (CH3COCH3), ethanol (C2H5OH) and ammonia (NH3) at optimum operating temperature. (C) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

10aLPG sensor10aPalladium10aSnO210aThick film1 aBagal, L., K.1 aPatil, J., Y.1 aMulla, Imtiaz, S.1 aSuryavanshi, S., S. uhttps://library.ncl.res.in/content/influence-pd-loading-gas-sensing-characteristics-sno2-thick-films-0