01622nas a2200169 4500008004100000022001400041245007900055210006900134260007100203300001600274490000800290520098400298100001901282700002201301700002601323856010301349 2005 eng d a1520-610600aEffect of RuO2 in the shape selectivity of submicron-sized SnO2 structures0 aEffect of RuO2 in the shape selectivity of submicronsized SnO2 s a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcJUN a12297-123030 v1093 a

Several dissimilar types of tin oxide microstructures including bipyramids, cubes, and wires synthesized effectively by means of a simple approach were investigated using X-ray diffraction (XRD), thermogravimetry/ differential thermometric analysis (TG-DTA), and X-ray photoelectron spectroscopy (XPS). A possible growth mechanism is proposed using the results of these studies. The texture coefficient values of all the structures, indexed to a tetragonal lattice, exhibit amazing variation in the preferred orientation with respect to their shapes. Although XPS data indicate that wires and cubes have a strong SnO2 type signal, bipyramids interestingly exhibit both SnO and SnO2 signals and a correlation of the binding energy helps in understanding the growth kinetics of such submicron structures. The. results suggest that the bipyramids are formed because of the vapor-solid process (VS) while wires and cubes are formed by the vapor-liquid-solid (VLS) progression.

1 aRamgir, N., S.1 aMulla, Imtiaz, S.1 aVijayamohanan, K., P. uhttps://library.ncl.res.in/content/effect-ruo2-shape-selectivity-submicron-sized-sno2-structures-002464nas a2200301 4500008004100000022001400041245005800055210005800113260007300171300001200244490000800256520158500264653001301849653000901862653002201871653000801893653000801901653000801909653002101917100002001938700001801958700001901976700002001995700001802015700002202033700002102055856008602076 2006 eng d a0022-024800aEffect of annealing on properties of ZrSe2 thin films0 aEffect of annealing on properties of ZrSe2 thin films aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcSEP a254-2590 v2943 a

Thin films of ZrSe2 have been prepared on stainless steel and fluorine-doped tin oxide-coated glass substrates using electrodeposition technique at potentiostatic mode. Double-distilled water containing precursors Zr and Se with ethylene diamine tetra-acetic acid disodium salt as a complexing agent was used to obtain good quality deposits by controlling the rate of reaction. The preparative parameters such as concentration of bath, deposition time, bath temperature, pH of the bath and annealing temperature have been optimized using photoelectrochernical (PEC) technique. The films deposited at optimum preparative parameters are annealed at different temperatures. The film annealed at 200 degrees C shows more photosensitivity. The as-deposited and annealed films at 200 degrees C have been characterized by X-ray diffraction (XRD), energy dispersive analysis by X-ray (EDAX), optical absorption and scanning electron microscopy (SEM). The XRD analysis of the as-deposited and annealed films showed the presence of polycrystalline nature with hexagonal crystal structure. EDAX study reveals that deposited films are almost stoichiometric. Optical absorption study shows the presence of direct transition and band gap energies are found to be 1.5 and 1.38 eV, respectively, for the as-deposited and annealed films. SEM study revels that the grains are uniformly distributed over the surface of substrate for the as-deposited as well as annealed film, which indicates formation of good and compact type of crystal structure. (c) 2006 Elsevier B.V. All rights reserved.

10aband gap10aEDAX10aElectrodeposition10aPEC10aSEM10aXRD10aZrSe2 thin films1 aHankare, P., P.1 aAsabe, M., R.1 aKokate, A., V.1 aDelekar, S., D.1 aSathe, D., J.1 aMulla, Imtiaz, S.1 aChougule, B., K. uhttps://library.ncl.res.in/content/effect-annealing-properties-zrse2-thin-films-001371nas a2200205 4500008004100000022001400041245006700055210006700122260012500189300002300314490000700337520058300344100002600927700002300953700002000976700002500996700002201021700003001043856009201073 2007 eng d a0003-695100aEnergy analysis of field emitted electrons from a ZnO tetrapod0 aEnergy analysis of field emitted electrons from a ZnO tetrapod aCIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USAbAMER INST PHYSICScAPR aArticle No. 1621020 v903 a

The experimental total energy distribution (TED) of the field emitted electrons from a single pod of a ZnO tetrapod has been obtained, exhibiting a two-peak feature. The energy difference between the two peaks in the TED is found to be nearly equal to the band gap of the bulk ZnO. The results show that field emitted electrons originate from both the conduction and valence bands. The peak position dependence on the applied voltage has also been observed. In the present case, the size of the ZnO tetrapod is not small enough to reflect the quantum confinement effects.

1 aAl-Tabbakh, Ahmed, A.1 aMore, Mahendra, A.1 aJoag, Dilip, S.1 aRamgir, Niranjan, S.1 aMulla, Imtiaz, S.1 aPillai, Vijayamohanan, K. uhttps://library.ncl.res.in/content/energy-analysis-field-emitted-electrons-zno-tetrapod02481nas a2200229 4500008004100000022001400041245010800055210006900163260009900232300001400331490000700345520159100352653003401943653001501977653001901992100002602011700002202037700002202059700002202081700001702103856013102120 2008 eng d a0032-386100aEffect of synthesis procedure on the structure and properties of palladium/polycarbonate nanocomposites0 aEffect of synthesis procedure on the structure and properties of aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLANDbELSEVIER SCI LTDcJUL a3413-34180 v493 a

In this paper, we compare two procedures for the synthesis of palladium (Pd)/polycarbonate (PC) nanocomposites as well as their morphological, optical, thermal and electrical properties. Pd nanoclusters were produced by the reduction of palladium chloride using a variation of Brust's method. Discrete I'd nanoclusters of similar to 15 nm size were formed in the absence of PC in the reaction mixture (ex situ method) while agglomeration of Pd nanoclusters was noticed in the presence of PC in the reaction mixture (in situ method). Fourier transform infrared spectroscopy (FTIR) suggests nanoparticle-polymer interactions and polymer conformational changes in the in situ nanocomposite films. Even after having the same Pd content, the ex situ nanocomposites films were found to transmit more light than the in situ nanocomposites. The glass transition temperature (T-g), decreased by similar to 16 degrees C for both the ex situ and in situ samples. Thermogravimetric analysis (TGA) indicated that the presence of Pd nanoclusters significantly improved the thermal stability of the nanocomposites, as evidenced by the enhanced onset of degradation by similar to 20 degrees C and similar to 40 degrees C for the in situ and ex situ nanocomposites, respectively. The electrical conductivity measurement shows a dramatic difference between these nanocomposites with a significantly higher value for the in situ nanocomposite (resistivity = 2.1 X 10(5) Omega m) compared to the ex situ nanocomposite (resistivity = 7.2 x 10(13) Omega m). (c) 2008 Elsevier Ltd. All rights reserved.

10ain situ and ex situ syntheses10aMorphology10aNanocomposites1 aValmikanathan, O., P.1 aOstroverkhova, O.1 aMulla, Imtiaz, S.1 aVijayamohanan, K.1 aAtre, S., V. uhttps://library.ncl.res.in/content/effect-synthesis-procedure-structure-and-properties-palladiumpolycarbonate-nanocomposites-002299nas a2200241 4500008004100000022001400041245011800055210006900173260009200242300001400334490000600348520130800354653002301662653004401685653005201729653001501781653003201796100002301828700002301851700002201874700003001896856013101926 2008 eng d a1533-488000aElectrochemical sensing of sulphur dioxide: a comparison using dodecanethiol and citrate capped gold nanoclusters0 aElectrochemical sensing of sulphur dioxide a comparison using do a26650 THE OLD RD, STE 208, VALENCIA, CA 91381-0751 USAbAMER SCIENTIFIC PUBLISHERScJUN a3184-31900 v83 a

A comparison of cyclic voltammograms of dodecanethiol (DDT) capped Au nanoclusters (5.0 +/- 0.5 nm) and trisodium citrate (Cit) capped Au nanoclusters (similar to 10-15 nm) modified glassy carbon electrode shows a dramatic variation in the current when exposed to a small amount of sulphur dioxide. This is explained using the electrocatalytic properties of Au nanoclusters towards the oxidation of SO2, thus facilitating the fabrication of electrochemical sensors for the detection of SO2. The intrinsic redox changes observed for gold nanocluster-modified glassy carbon electrodes disappear on passing SO2, despite a dramatic current increase, which indeed scales up with the amount of dissolved SO2. Interestingly, a complete rejuvenation of the redox behavior of gold is also observed on subsequent removal of SO2 from the solution by passing pure nitrogen for 15 minutes. Further, these nanoclusters when characterized with X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR) after SO2 passage reveal a variety of SO2 adsorption modes on gold surface. XP spectra also show a shift of 1.03 eV towards higher binding energy indicating a strong adsorption of SO2 gas, while FTIR gives conclusive evidence for the interaction of SO2 with gold nanoparticles.

10acyclic voltammetry10aFourier transform infrared spectroscopy10amonolayer protected gold nanoclusters (Au-MPCs)10aSO2 sensor10aX-ray photoelectron spectra1 aSathe, Bhaskar, R.1 aRisbud, Mandar, S.1 aMulla, Imtiaz, S.1 aPillai, Vijayamohanan, K. uhttps://library.ncl.res.in/content/electrochemical-sensing-sulphur-dioxide-comparison-using-dodecanethiol-and-citrate-capped-001441nas a2200217 4500008004100000022001400041245006600055210006600121260012500187300001100312490000700323520062500330100002300955700002800978700002201006700003001028700002401058700002301082700002001105856009801125 2008 eng d a0003-695100aEnhanced field emission from hexagonal rhodium nanostructures0 aEnhanced field emission from hexagonal rhodium nanostructures aCIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USAbAMER INST PHYSICScJUN a2531060 v923 a

Shape selective synthesis of nanostructured Rh hexagons has been demonstrated with the help of a modified chemical vapor deposition using rhodium acetate. An ultralow threshold field of 0.72 V/mu m is observed to generate a field emission current density of 4 x 10(-3) mu A/cm(2). The high enhancement factor (9325) indicates that the origin of electron emission is from nanostructured features. The smaller size of emitting area, excellent current density, and stability over a period of more than 3 h are promising characteristics for the development of electron sources. (C) 2008 American Institute of Physics.

1 aSathe, Bhaskar, R.1 aKakade, Bhalchandra, A.1 aMulla, Imtiaz, S.1 aPillai, Vijayamohanan, K.1 aLate, Dattatray, J.1 aMore, Mahendra, A.1 aJoag, Dilip, S. uhttps://library.ncl.res.in/content/enhanced-field-emission-hexagonal-rhodium-nanostructures-002154nas a2200265 4500008004100000022001400041245005700055210005600112260006900168300001200237490000800249520136900257653002001626653000801646653000801654653001501662653000801677100002401685700001301709700001701722700002201739700001901761700002101780856008701801 2008 eng d a0925-400500aEPR and DRS evidence for NO2 sensing in Al-doped ZnO0 aEPR and DRS evidence for NO2 sensing in Aldoped ZnO aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcMAR a668-6730 v1303 a

Zinc oxide (ZnO) is a well-known semiconducting multifunctional material wherein properties right from the morphology to gas sensitivity can be tailor-made by doping or surface modification. Aluminum (Al)-incorporated porous zinc oxide (AI:ZnO) exhibits good response towards NO2 at low-operating temperature. The NO2 gas concentration as low as 20 ppm exhibits S = 17% for 5 wt. % Al-incorporated ZnO. The NO2 response increases with operating temperature and concentration and reaches to its maximum at 300 degrees C without any interference from other gases such as SO3, HCl, LPG and alcohol. Physico-chemical characterization likes differential thermogravimetric analysis (TG-DTA) electron paramagnetic resonance (EPR) and diffused reflectance spectroscopy (DRS) have been used to understand the sensing behavior for pure and A]-incorporated ZnO. The TG-DTA depicts formation of ZnO phase at 287 degrees C. The EPR study reveals distinct variation for O- (g=2.003) and Zn interstitial (g = 1.98) defect sites in pure and Al:ZnO. The DRS studies elucidate signature of adsorbed NO, species in aluminium-incorporated zinc oxide indicating its tendency to adsorb these species even at low temperatures. This paper is an attempt to correlate the gas sensing behavior with the physico-chemical studies such as EPR and DRS. (c) 2007 Published by Elsevier B.V.

10aaluminum doping10aDRS10aEPR10aNO2 sensor10aZnO1 aNavale, Shalaka, C.1 aRavi, V.1 aSrinivas, D.1 aMulla, Imtiaz, S.1 aGosavi, S., W.1 aKulkarni, S., K. uhttps://library.ncl.res.in/content/epr-and-drs-evidence-no2-sensing-al-doped-zno-001627nas a2200241 4500008004100000022001400041245009600055210006900151260007300220300001400293490000700307520076800314653001401082653002301096653002701119100002001146700001801166700002001184700001901204700001701223700002201240856012301262 2009 eng d a1293-255800aEffect of sintering temperature and thermoelectric power studies of the system MgFe2-xCrxO40 aEffect of sintering temperature and thermoelectric power studies aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcDEC a2075-20790 v113 a

Mixed metal oxides showing the spinel structure exhibit interesting structural and electrical properties. Substances with specific compositions in the system MgFe2-xCrxO4 were synthesized by the simple co-precipitation method and have been investigated by X-ray diffraction (XRD) and scanning electron microscope (SEM) to study the effect of temperature on the size of particles and grains. The infrared spectrum shows, two strong bands around 600 and 500 cm(-1). An elemental composition of one of the samples, MgFeCrO4 was found by energy dispersive X-ray spectroscopy (EDS). The thermoelectric power measurements carried out from room temperature to 500 degrees C, show both n-type and p-type behavior. (C) 2009 Elsevier Masson SAS. All rights reserved.

10asynthesis10aTemperature effect10aThermoelectric studies1 aHankare, P., P.1 aVader, V., T.1 aSankpal, U., B.1 aGavali, L., V.1 aSasikala, R.1 aMulla, Imtiaz, S. uhttps://library.ncl.res.in/content/effect-sintering-temperature-and-thermoelectric-power-studies-system-mgfe2-xcrxo4-001411nas a2200181 4500008004100000022001400041245007600055210006900131260007300200300001200273490000800285520073500293100002301028700002201051700002201073700003001095856010401125 2010 eng d a0009-261400aEffect of Fe3O4 on morphology of Fe-SnO2 hyperbranched heterostructures0 aEffect of Fe3O4 on morphology of FeSnO2 hyperbranched heterostru aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcJUN a121-1250 v4933 a

A simple modified thermal evaporation technique is employed for the synthesis of microstructured Fe:SnO2 system and their plausible growth mechanism has been proposed based on the results from various characterization techniques. Such structures grow in two steps; initially, growth of Fe core takes place from Fe3O4 source which acts as nucleating site for SnO2 growth on its surface as per the vapor-liquid- solid progression. Moreover, the composition of Fe/Sn source and temperature are found to have key roles in governing their morphology. XPS studies clearly demonstrate the presence of Fe species, which acts as a catalyst along with source for hetero-structure growth with SnO2. (C) 2010 Published by Elsevier B.V.

1 aSathe, Bhaskar, R.1 aWalke, Pravin, S.1 aMulla, Imtiaz, S.1 aPillai, Vijayamohanan, K. uhttps://library.ncl.res.in/content/effect-fe3o4-morphology-fe-sno2-hyperbranched-heterostructures-001550nas a2200217 4500008004100000022001400041245012600055210006900181260006900250300001200319490000800331520074200339653001401081653001701095653002001112653001401132653001501146100002401161700002201185856012501207 2011 eng d a0925-400500aEffect of aluminium doping on structural and gas sensing properties of zinc oxide thin films deposited by spray pyrolysis0 aEffect of aluminium doping on structural and gas sensing propert aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcAUG a943-9480 v1563 a

A facile spray pyrolysis route is used to deposit aluminium doped ZnO (AZO) thin films on to the glass substrates. It is observed that on aluminium doping the particle size of ZnO reduces significantly; moreover, uniformity of particle also gets enhanced. Their XRD study reveals that intensity ratio of crystal planes depend on the aluminium doping concentration. The gas response studies of; similar to 800 nm thick Al-doped ZnO films at different operating temperatures show that 5 at% Al-doped ZnO thin film exhibits highest response towards H(2)S gas at 200 degrees C. The results suggest that the gas response strongly depends on the particle size and aluminium doping in the ZnO. (C) 2011 Elsevier B.V. All rights reserved.

10aAluminium10aH(2)S sensor10aSpray pyrolysis10athin film10aZinc oxide1 aBadadhe, Satish, S.1 aMulla, Imtiaz, S. uhttps://library.ncl.res.in/content/effect-aluminium-doping-structural-and-gas-sensing-properties-zinc-oxide-thin-films-001888nas a2200241 4500008004100000022001400041245008900055210006900144260006900213300001200282490000800294520105600302653002301358653001501381653001801396653001501414100001801429700001801447700002501465700002201490700002401512856011001536 2015 eng d a0925-400500aEffect of Pd and Ce on the enhancement of ethanol vapor response of SnO2 thick films0 aEffect of Pd and Ce on the enhancement of ethanol vapor response aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcFEB a383-3900 v2073 a

The undoped SnO2 and 4 wt% Ce-doped SnO2 were successfully synthesized by a facile co-precipitation route. The ternary systems were prepared by Pd-loading (0.5, 1.5 and 3.0 wt%) on the 4 wt% Ce-doped SnO2 nanoparticles. The structure and morphology of the nanocrystalline powders were investigated by X-ray diffraction, scanning electron microscopy and transmission electron microscopy techniques. The nanocrystalline powders were screen printed on the alumina substrates to form thick films to investigate their gas response properties. The gas response studies reveal that 4 wt% Ce-doped SnO2 with the loading of 3.0 wt% Pd exhibits high response (88%) towards ethanol (100 ppm) at an operating temperature of 250 degrees C with quick response (6 s) and rapid recovery (20 s). The high ethanol vapor response at lower operating temperature of this sensor is attributed to the spill-over mechanism of Pd particles present on the SnO2 surface and enhancement in alkalescence of SnO2 due to Ce-doping. (C) 2014 Elsevier B.V. All rights reserved.

10aCe-doped tin oxide10aGas sensor10aSemiconductor10aThick film1 aBagal, L., K.1 aPatil, J., Y.1 aVaishampayan, M., V.1 aMulla, Imtiaz, S.1 aSuryavanshi, S., S. uhttps://library.ncl.res.in/content/effect-pd-and-ce-enhancement-ethanol-vapor-response-sno2-thick-films-0