01551nas a2200193   4500008004100000022001400041245009000055210006900145260010600214300001200320490000800332520078800340653003501128653002301163653001901186100001801205700002501223856010901248       2005                        eng d  a0038-109800aElectronic structure and ferromagnetism of polycrystalline Zn1-xCoxO (0 <= x <= 0.15)0 aElectronic structure and ferromagnetism of polycrystalline Zn1xC  aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcJUN  a665-6690 v1343 a<p>The electronic structure of polycrystalline ferromagnetic Zn1-x,CoxO (0.05 &lt;= x &lt;= 0.15) and the oxidation state of Co in it, have been investigated. The Co-doped polycrystalline samples are synthesized by a combustion method and are ferromagnetic at room temperature. XPS and optical absorption studies show evidence for Co2+ ions in the tetrahedral symmetry, indicating, substitution of Co2+ in the ZnO lattice. However, powder XRD and electron diffraction data shock the presence of Co metal in the samples. This give evidence to the fact that some Co2+ ion are incorporated in the ZnO lattice which gives changes in the electronic structure whereas ferromagnetism comes from the Co metal impurities present in the samples. (c) 2005 Elsevier Ltd. All rights reserved.</p>10aMagnetically ordered materials10aOptical properties10aSemiconductors1 aDeka, Sasanka1 aJoy, Pattayil, Alias  uhttps://library.ncl.res.in/content/electronic-structure-and-ferromagnetism-polycrystalline-zn1-xcoxo-0-001460nas a2200217   4500008004100000022001400041245004500055210004500100260009900145300001200244490000700256520078700263653002301050653001901073653001801092653000801110100001801118700001901136700001301155856007401168       2007                        eng d  a0272-884200aInfluence of surfactant on ZnO varistors0 aInfluence of surfactant on ZnO varistors  aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLANDbELSEVIER SCI LTDcMAR  a289-2910 v333 a<p>ZnO varistors with and without surfactant such as sodium dodecyl sulphate (SIDS) are prepared by nitrate-combustion process. The samples were identically heat treated and sintered at 1000 degrees C for 12 h to study the influence of the surfactant on the nonlinear electrical properties of polycrystalline ZnO. It is observed that the nonlinear coefficient decreases marginally (alpha = 35) for samples prepared with surfactant, whereas breakdown field (E-B = 130 V/mm) decreased significantly. The corresponding parameters for the samples synthesized without surfactant are alpha = 45 and E-B = 400 V/mm. Hence, this method can be used for the manufacture of varistors with low to moderate breakdown fields. (c) 2005 Elsevier Ltd and Techna Group S.r.l. All rights reserved.</p>10aChemical synthesis10aSemiconductors10aX-ray methods10aZnO1 aDhage, S., R.1 aNavale, S., C.1 aRavi, V.  uhttps://library.ncl.res.in/content/influence-surfactant-zno-varistors01760nas a2200229   4500008004100000022001400041245007600055210006900131260007300200300001400273490000700287520096700294653001801261653001101279653001901290653001201309100002501321700002401346700002801370700002201398856011001420       2008                        eng d  a0167-577X00aFacile synthesis and gas sensing properties of nanotriangular tin oxide0 aFacile synthesis and gas sensing properties of nanotriangular ti  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcNOV  a4328-43310 v623 a<p>In the present study we report a simple and convenient chemical route using pentaerythritol as a structure-directing agent for the synthesis of crystalline nanotriangular SnO2. We propose the scheme for the formation of nanotriangular structures wherein the preliminary spherical nanocrystallites are formed due to the low surface energy associated with them. These spherical nanocrystallites grow into the various linear intermediate shapes like Y, bi and tripods, which finally lead to the triangles, pyramids and bipyramids. Such variation in the structure occurs due to the structure directing pentaerythritol. These polycrystalline SnO2 nanomaterials with structural peculiarities were tested for the gas sensing characteristics. Their response towards ethanol vapor, H-2 and LPG were investigated. It was found to exhibit high response towards ethanol vapors at the operating temperature of 250 degrees C. (C) 2008 Elsevier B.V. All rights reserved.</p>10aNanomaterials10aOxides10aSemiconductors10asensors1 aDeshmukh, Rupali, G.1 aBadadhe, Satish, S.1 aVaishampayan, Mukta, V.1 aMulla, Imtiaz, S.  uhttps://library.ncl.res.in/content/facile-synthesis-and-gas-sensing-properties-nanotriangular-tin-oxide-001515nas a2200253   4500008004100000022001400041245008900055210006900144260010600213300001200319490000700331520058000338653002300918653001700941653001900958653001900977653002200996100002201018700002201040700002301062700002701085700002601112856012301138       2009                        eng d  a0025-540800aEpitaxially grown zinc-blende structured Mn doped ZnO nanoshell on ZnS nanoparticles0 aEpitaxially grown zincblende structured Mn doped ZnO nanoshell o  aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcFEB  a339-3440 v443 a<p>Zinc oxide in the bulk as well as in the nanocrystalline form is thermodynamically stable in the wurtzite structure. However, zinc oxide in the zinc-blende structure is more useful than that in the wurtzite structure due to its superior electronic properties as well as possibility of efficient doping. Therefore, zinc oxide shell is grown epitaxially on zinc sulphide core nanoparticles having zinc-blende structure. It is shown that doping of manganese could be achieved in zinc oxide nanoshell with zinc-blende structure. (C) 2008 Elsevier Ltd. All rights reserved.</p>10aChemical synthesis10aLuminescence10aNanostructures10aSemiconductors10aX-ray diffraction1 aLimaye, Mukta, V.1 aSingh, Shashi, B.1 aDate, Sadgopal, K.1 aGholap, Ramkrishna, S.1 aKulkarni, Sulabha, K.  uhttps://library.ncl.res.in/content/epitaxially-grown-zinc-blende-structured-mn-doped-zno-nanoshell-zns-nanoparticles-001799nas a2200229   4500008004100000022001400041245009900055210006900154260007400223300001200297490000700309520099100316653001901307653001901326653002501345653001401370653000801384100001401392700001901406700002501425856011901450       2009                        eng d  a1388-076400aSolid state synthesis and room temperature magnetic properties of iron phosphide nanoparticles0 aSolid state synthesis and room temperature magnetic properties o  aVAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDSbSPRINGERcFEB  a491-4970 v113 a<p>Room temperature magnetic properties have been achieved for nano-crystalline iron phosphide synthesized from the direct solid state reaction of iron chloride and tri-octylphosphine (TOP). The magnetization continuously increased with higher magnetic fields, indicating a super-paramagnetic behavior. It is observed that room temperature magnetism is possible for the material showing antiferromagnetic nature at low temperatures. In the present synthesis, TOP acted as a source of phosphorus as well as a surfactant. X-ray diffraction (XRD) studies revealed that the black powder is a mixture of FeP and Fe(2)P. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) showed elongated as well spherical particles. Energy dispersion X-ray analysis (EDAX) confirmed a non-stoichiometric iron phosphide. Presence of TOP was confirmed by infra-red (IR) spectroscopy, and thermo-gravimetric analysis (TGA) indicated about 6% wt. loss due to presence of organics.</p>10aIron phosphide10aSemiconductors10aSolid state reaction10asynthesis10aXRD1 aSingh, N.1 aKhanna, P., K.1 aJoy, Pattayil, Alias  uhttps://library.ncl.res.in/content/solid-state-synthesis-and-room-temperature-magnetic-properties-iron-phosphide-002040nas a2200241   4500008004100000022001400041245009700055210006900152260007400221300001200295490000700307520118300314653002301497653002201520653001901542653002001561100001901581700001901600700001801619700001801637700001801655856012501673       2010                        eng d  a1388-076400aOne-pot synthesis of oleic acid-capped cadmium chalcogenides (CdE: E = Se, Te) nano-crystals0 aOnepot synthesis of oleic acidcapped cadmium chalcogenides CdE E  aVAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDSbSPRINGERcJAN  a101-1090 v123 a<p>Surface-capped CdSe and CdTe nano-crystals (NCs) have been synthesized using cadmium acetate, oleic acid and respective tri-octylphosphine chalcogenide (TOPE; E = Se/Te) in diphenyl ether (DPE). Well-dispersed CdSe particles showed two absorption bands at the region of 431-34 and 458-60 nm in optical absorption study. A band-edge emission resulted at 515 nm with an excitation energy of 400 nm, in its photoluminescence (PL) spectrum. Similarly, UV-visible absorption study of CdTe revealed an absorption band at &lt; 700 nm. The broadened X-ray diffraction (XRD) pattern showed that at higher reaction temperature cubic CdSe but hexagonal CdTe can be obtained with crystallite size of &lt; 10 nm. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) revealed that agglomerated particles are of spherical nature. The inter-planar spacing in CdTe was measured to be 0.406 nm, a characteristic of (100) lattice plane in hexagonal CdTe. X-ray photoelectron spectroscopy (XPS) showed that CdSe NCs have better air stability stable than CdTe. Presence of organic moiety around the semiconductor particles was confirmed by infrared (IR) spectroscopy.</p>10aChemical synthesis10aphotoluminescence10aSemiconductors10aSurface capping1 aKhanna, P., K.1 aRao, Srinivasa1 aPatil, K., R.1 aSingh, V., N.1 aMehta, B., R.  uhttps://library.ncl.res.in/content/one-pot-synthesis-oleic-acid-capped-cadmium-chalcogenides-cde-e-se-te-nano-crystals-001635nas a2200253   4500008004100000022001400041245009400055210006900149260006900218300001200287490000800299520075400307653001901061653001901080653001501099653002201114100002001136700001901156700002101175700001801196700002201214700002001236856012501256       2010                        eng d  a0925-838800aSynthesis and characterization of nickel selenide thin films deposited by chemical method0 aSynthesis and characterization of nickel selenide thin films dep  aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcFEB  a228-2310 v4903 a<p>Nickel selenide thin films have been deposited using chemical bath method on non-conducting glass substrates in a tartarate bath containing nickel sulphate octahydrate, hydrazine hydrate, sodium seleno-sulphate in an aqueous alkaline medium. The grown films were uniform, well adherent and black in color. The films were characterized using X-ray diffraction, scanning electron microscopy, optical absorption and electrical measurements. The nickel selenide thin film revealed polycrystalline nature with hexagonal system. The direct optical band gap of the film was found to be 1.61 eV. Electrical resistivity of film was observed in the order of 10(3) (Omega cm) with p-type conduction mechanism. (C) 2009 Elsevier B.V. All rights reserved.</p>10aCrystal growth10aSemiconductors10aThin films10aX-ray diffraction1 aHankare, P., P.1 aJadhav, B., V.1 aGaradkar, K., M.1 aChate, P., A.1 aMulla, Imtiaz, S.1 aDelekar, S., D.  uhttps://library.ncl.res.in/content/synthesis-and-characterization-nickel-selenide-thin-films-deposited-chemical-method-002853nas a2200229   4500008004100000022001400041245014600055210006900201260006900270300001200339490000800351520198800359653001902347653001502366653001902381653001902400653001902419100002202438700002102460700001802481856012402499       2011                        eng d  a0254-058400aRole of lattice defects and crystallite morphology in the UV and visible-light-induced photo-catalytic properties of combustion-prepared TiO20 aRole of lattice defects and crystallite morphology in the UV and  aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcAPR  a546-5540 v1263 a<p>The physico-chemical, photo-physical and micro-structural properties responsible for the strikingly different photocatalytic behavior of combustion-prepared TiO2 (c.TiO2) and Degussa P25 (d.TiO2) samples are elucidated in this study. Electron microscopy and selected area electron diffraction micrographs revealed that the two samples exhibited different morphologies. The grains of c.TiO2 were spherical and comprised of 5-6 nm size primary particle. On the other hand, d.TiO2 consisted of large (0.5-3.0 mu m) size and irregular shape aggregates having primary particles of 15-40 nm cross-sectional diameter. The ESR study revealed that the presence of certain defect states in c.TiO2 helped in stabilization of O-. and Ti3+-OH type species during room-temperature UV-irradiation. No such paramagnetic species were however formed over d.TiO2 under similar conditions. C1s and Ti 2p XPS spectra provide evidence for the presence of some lattice vacancies in c.TiO2 and also for the bulk Ti4+ -&gt; Ti3+ conversion during its UV-irradiation. Compared to d.TiO2, c.TiO2 displayed considerably higher activity for discoloration of methyl orange but very poor activity for splitting of water, both under UV and visible light radiations. This is attributed to enhanced surface adsorption of dye molecules over c.TiO2, because of its textural features and also the presence of photo-active ion-radicals. On the other hand, the poor activity of c.TiO2 for water splitting is related to certain defect-induced inter-band charge trapping states in the close vicinity of valence and conduction bands of c.TiO2, as revealed by thermoluminescence spectroscopy. Further, the dispersion of nanosize gold particles gave rise to augmented activity of both the catalysts, particularly for water splitting. This is explained by the promotional role of Au-0 or Au-0/TiO2 interfacial sites in the adsorption and charge-adsorbate interaction processes. (C) 2011 Elsevier B.V. All rights reserved.</p>10aBand-structure10aInterfaces10aMicrostructure10aNanostructures10aSemiconductors1 aDeshpande, Aparna1 aMadras, Giridhar1 aGupta, N., M.  uhttps://library.ncl.res.in/content/role-lattice-defects-and-crystallite-morphology-uv-and-visible-light-induced-photo-002032nas a2200217   4500008004100000022001400041245013700055210006900192260010600261300001400367490000700381520115400388653002501542653002301567653002401590653001501614653001901629100002101648700001801669856012701687       2012                        eng d  a0025-540800aEffects of grain morphology, microstructure and dispersed metal cocatalyst on the photoreduction of water over impurity-doped LaInO30 aEffects of grain morphology microstructure and dispersed metal c  aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcMAY  a1217-12280 v473 a<p>The single phase lanthanum indates doped with Ga (for La) and N (for O), i.e. La1-xGaxInO3 (0 &lt;= x &lt;= 0.2) and LaInO1-yNy (y similar to 0.6), exhibit significant activity for photoreduction of water; the yield of H-2 produced depending on dopant, excitation source, and addition of a sacrificial reagent. The two-step H-2 evolution observed for this reaction corresponds with the two distinct absorbance regimes displayed by these materials, one in UV-region due to bandgap excitation and the other in visible region arising from the transitions involving sub-bandgap donor or acceptor energy states. The photocatalytic activity of these d(10) metal oxides increases on coating with a metal/metal oxide co-catalyst, gold exhibiting superior activity to Pt and NiO, irrespective of excitation source and sample composition. The preparation-controlled particle morphology, doping-induced lattice imperfections, and metal/semiconductor hetero-junctions are envisaged to play a key role in the absorption characteristics and photocatalytic water reduction activity of metal/LaInO3 nanocomposites. (C) 2012 Elsevier Ltd. All rights reserved.</p>10aCatalytic properties10aChemical synthesis10aElectron microscopy10aInterfaces10aSemiconductors1 aDhanasekaran, P.1 aGupta, N., M.  uhttps://library.ncl.res.in/content/effects-grain-morphology-microstructure-and-dispersed-metal-cocatalyst-photoreduction-002123nas a2200277   4500008004100000022001400041245016400055210006900219260007300288300001000361490000800371520109900379653001901478653002301497653001401520653002401534653001801558653002001576100002001596700002201616700001501638700002701653700001801680700001801698856012901716       2016                        eng d  a0167-577X00aSynthesis of Sn-containing anatase (TiO2) by sol-gel method and their performance in catalytic water splitting under visible light as a function of tin content0 aSynthesis of Sncontaining anatase TiO2 by solgel method and thei  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcMAY  a50-540 v1713 a<p>Sol-gel route was employed to prepare a series of Sn-containing anatase with different molar (Ti/Sn) ratios ranging from 49 to 1. Samples were characterized by powder XRD, UV-vis, XPS, SEM, EDAX, low temperature N-2 sorption technique and Raman Spectroscopy. Except anatase phase, no other crystalline phase was observed when Ti/Sn molar ratio was varied from 49 to 9 and for Sn free sample. However, further decrease in the ratio lead to the appearance of additional SnO2 phase whose peak intensities were increased with the increase in the tin content. Irrespective of tin content, all samples showed red-shift in UV-vis spectra. Moreover, samples showed Raman shift to higher vibration side from 143 cm(-1) to 147 cm(-1) indicating the doping of Sn2+ into TiO2. By virtue of low band gap, anatase crystallite size and an absence of XRD visible SnO2, ST (19) has shown maximum photocatalytic activity upon 1 wt% Pt loading. It has exhibited the highest rate (0.1264 mmole/g/h) for visible light induced hydrogen evolution by water splitting. (C) 2016 Elsevier B.V. All rights reserved.</p>10aSemiconductors10aSn2+ doped titania10aSnO2/TiO210aSol-gel preparation10avisible light10awater splitting1 aTangale, N., P.1 aNiphadkar, P., S.1 aSamuel, V.1 aDeshpande, Suvarna, S.1 aJoshi, P., N.1 aAwate, S., V.  uhttps://library.ncl.res.in/content/synthesis-sn-containing-anatase-tio2-sol-gel-method-and-their-performance-catalytic-water