02406nas a2200265   4500008004100000022001400041245016100055210006900216260006900285300001200354490000700366520141600373653001701789653002101806653002701827653001301854100002301867700002301890700001801913700001701931700002001948700002001968700002401988856012802012       2005                        eng d  a0925-963500aGradual transitions in morphology of diamond films grown by using N-2 admixtures of CH4+H-2 gas in a hot filament assisted chemical vapour deposition system0 aGradual transitions in morphology of diamond films grown by usin  aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcFEB  a232-2420 v143 a<p>A study of the evolution of morphology of diamond films grown as a function of N-2 gas additions to the CH4+H-2 precursor in an HF-CVD system is presented. With the increase of admixture of N2 fraction, in contrast to earlier studies, the morphology was observed first to gradually change from {111}-faceted crystallites texture to that of an intermediate cubo-octahedral crystallite texture and then gradually but finally to transform completely into that of {100}-faceted crystallites. The threshold nitrogen concentration, [N-2](thr), required to bring about the said transition in morphology was much larger than it was reported previously. Moreover, the morphology transition required a larger [N-2](thr) when a large fraction of methane was employed. Further additions of nitrogen, that just exceeded the [N-2](thr), resulted in growth of films containing slightly bigger {100}-multi-layered grains or isolated planar {100}-platelets. For extremely large nitrogen additions, the growth of nanocrystalline or amorphous carbon films was observed. The N-2 additions more than 50 vol.% did not yield any deposition. Raman scattering and photoluminescence measurements were used respectively for characterizing the quality and nitrogen doping in the films. These results are attributed to the possible catalytic role of atomic nitrogen at the growing surface. (C) 2005 Elsevier B.V. All rights reserved.</p>10adiamond film10ahot filament CVD10amorphology transitions10anitrogen1 aKshirsagar, S., T.1 aKshirsagar, R., B.1 aPatil, P., S.1 aKulkarni, A.1 aMandate, A., B.1 aGaikwad, A., B.1 aGokhale, Suresh, P.  uhttps://library.ncl.res.in/content/gradual-transitions-morphology-diamond-films-grown-using-n-2-admixtures-ch4h-2-gas-hot-102657nas a2200241   4500008004100000022001400041245005700055210005600112260009200168300001200260490000800272520186700280653000802147653002402155653002002179653003502199653001002234653000802244100002502252700002402277700002602301856008802327       2005                        eng d  a1042-015000aSurface disorder in c-Si induced by swift heavy ions0 aSurface disorder in cSi induced by swift heavy ions  a4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLANDbTAYLOR & FRANCIS LTDcJUN  a207-2180 v1603 a<p>The disorders induced in crystalline silicon (c-Si) through the process of electronic energy loss in the swift heavy ion irradiation were investigated. A number of silicon &lt;100&gt; samples were irradiated with 65 MeV oxygen ions at different fluences, 1x10(13) to 1.5x10(14) ions/cm(2), and characterized by the Raman spectroscopy, the optical reflectivity, the X-ray reflectivity, the atomic force microscopy (AFM) and the X-ray diffraction (XRD) techniques. The intensity, redshift, phonon coherence length and asymmetric broadening associated with the Raman peaks reveal that stressed and disordered lattice zones are produced in the surface region of the irradiated silicon. The average crystallite size, obtained by analyzing Raman spectrum with the phonon confinement model, was very large in the virgin silicon but decreased to &lt;100 nm dimension in the ion irradiated silicon. The results of the X-ray reflectivity, AFM and optical reflectivity of 200-700 nm radiation indicate that the roughness of the silicon surface has enhanced substantially after ion irradiation. The diffusion of oxygen in silicon surface during ion irradiation is evident from the oscillation in the X-ray reflectivity spectrum and the sharp decrease in the reflectivity of 200-400 nm radiation. The rise in temperature, estimated from the heat spike model, was high enough to melt the local silicon surface. The results of XRD indicate that lattice defects have been induced and a new plane &lt;211&gt; has been formed in the silicon &lt;100&gt; after ion irradiation. The results of the present study show that the energy deposited in crystalline silicon through the process of electronic energy loss similar to 0.944 keV/nm per ion is sufficient to induce disorders of appreciable magnitude in the silicon surface even at a fluence of similar to 10(13) ions/cm(2).</p>10aAFM10acrystalline silicon10aion irradiation10aoptical and X-ray reflectivity10aRaman10aXRD1 aBogle, Kashinath, A.1 aGokhale, Suresh, P.1 aBhoraskar, Vasant, N.  uhttps://library.ncl.res.in/content/surface-disorder-c-si-induced-swift-heavy-ions-001390nas a2200241   4500008004100000022001400041245004400055210004400099260007300143300001400216490000700230520064600237653002300883653001100906653001800917653003700935653002200972100001700994700002301011700002401034700001201058856007801070       2006                        eng d  a0167-577X00aLow temperature route to prepare LaMnO30 aLow temperature route to prepare LaMnO3  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcMAY  a1213-12140 v603 a<p>A combination of digestion and further low temperature calcination to crystallize the product is employed to prepare LaMnO3(LM) ceramics. Freshly co-precipitated lanthanum and manganese hydroxides gel is allowed to react at 100 degrees C under refluxing and stirring conditions for 6-12 h. The X-ray amorphous product so formed is heated at 300 degrees C to form crystalline LM powders. This is the lowest temperature so far reported for the formation of LaMnO3. Transmission electron microscope (TEM) investigations revealed that the average particle size is 50 nm for the calcined powders. (c) 2005 Elsevier B.V All rights reserved.</p>10aChemical synthesis10aLaMnO310aPrecipitation10atransmission electron microscopy10aX-ray diffraction1 aDaundkar, A.1 aKale, Sangeeta, N.1 aGokhale, Suresh, P.1 aRavi, V  uhttps://library.ncl.res.in/content/low-temperature-route-prepare-lamno3-001533nas a2200277   4500008004100000022001400041245008000055210006900135260007300204300001200277490000700289520063100296653001300927653002400940653002100964653001100985653001800996653002201014100001801036700001901054700001801073700001901091700002401110700001301134856010801147       2008                        eng d  a0167-577X00aSynthesis of LSMO at low temperature by novel hydroxide precursor technique0 aSynthesis of LSMO at low temperature by novel hydroxide precurso  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcFEB  a527-5290 v623 a<p>A novel technique of mixing individual hydroxide is employed to prepare La0.65Sr0.35MnO3 (LSMO) at low temperature. Freshly prepared lanthanum and manganese hydroxides are mixed thoroughly with strontium hydroxide in stoichiometric ratio and heated at different temperatures ranging from 100 to 500 degrees C for 6 h. At 500 degrees C, formation of La0.65Sr0.35MnO3 was confirmed by the X-ray diffraction studies (XRD). This is the lowest temperature so far reported in the literature. The particle size and morphology were investigated by scanning electron microscopy (SEM). (c) 2007 Elsevier B.V. All rights reserved.</p>10aCeramics10aElectron microscopy10aLa0.65Sr0.35MnO310aOxides10aPrecipitation10aX-ray diffraction1 aGupta, U., N.1 aMuthurajan, H.1 aKumar, H., H.1 aRao, Koteswara1 aGokhale, Suresh, P.1 aRavi, V.  uhttps://library.ncl.res.in/content/synthesis-lsmo-low-temperature-novel-hydroxide-precursor-technique-002141nas a2200265   4500008004100000022001400041245015400055210006900209260010600278300001400384490000700398520101700405653003501422653001801457653005001475653002601525653001301551653003801564653004801602100002401650700002401674700002501698700002301723856012901746       2010                        eng d  a0013-468600aFabrication, characterization and electrochemical performance of single strand carbon fiber prepared by catalytic chemical vapor decomposition method0 aFabrication characterization and electrochemical performance of   aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcFEB  a2022-20280 v553 a<p>Preparation, fabrication and voltammetric characterizations of a single strand of carbon fiber (SSCF) electrode and their potential applications for biosensor are presented. SSCFs of diameter ca. 10 +/- 2 mu m and few millimeters in length are prepared by catalytic chemical vapor decomposition (CCVD) method. Voltammetry with potassium ferricyanide. alpha-methylferrocene methanol and hexaammineruthenium(III) chloride on SSCF electrode are used as bench marks to validate the electrode properties. Quasi-steady state voltammograms obtained were fitted into a cylindrical diffusion model From which, the standard rate constant (k(0)) and electron transfer coefficient (alpha) are obtained. The use of SSCF electrode is demonstrated for the voltammetric detection of the micromolar quantity of dopamine in the presence of large excess (ca. 200 times) of ascorbic acid, without any fouling of electrode surface. The kinetics of electron transfer are investigated. (C) 2009 Elsevier Ltd All rights reserved.</p>10aalpha-Methylferrocene methanol10aAscorbic acid10aCatalytic chemical vapor decomposition (CCVD)10aCylindrical diffusion10adopamine10aHexaammineruthenium(III) chloride10aSingle strand carbon fiber (SSCF) electrode1 aJoshi, Vrushali, S.1 aGokhale, Suresh, P.1 aPatil, Kashinath, R.1 aHaram, Santosh, K.  uhttps://library.ncl.res.in/content/fabrication-characterization-and-electrochemical-performance-single-strand-carbon-fiber-001411nas a2200193   4500008004100000022001400041245008800055210006900143260009200212300001200304490000600316520065400322100002800976700002101004700002201025700002401047700002901071856011701100       2010                        eng d  a1936-661200aPd-functionalized carbon nanotubes for selective hydrogenation of 2-butyne-1,4-diol0 aPdfunctionalized carbon nanotubes for selective hydrogenation of  a26650 THE OLD RD, STE 208, VALENCIA, CA 91381-0751 USAbAMER SCIENTIFIC PUBLISHERScSEP  a313-3180 v33 a<p>Multiwalled carbon nanotubes were prepared by thermal decomposition method followed by acid treatment and Pd-functionalization with PdCl2 by wet impregnation method. The Pd functionlized carbon nanotubes catalyst was characterized by BET, FT-IR, Raman, XRD, EDX, ICP-OES, SEM and TEM and was evaluated for its activity for hydrogenation of 2-butyne-1,4-diol. It showed higher selectivity (93%) to 2-butene-1,4-diol than Pd supported on commercial carbon (70% selectivity to 2-butene-1,4-diol) for complete conversion of 2-butyne-1,4-diol. The catalyst also exhibited excellent stability as evidenced by the three catalyst recycle experiments.</p>1 aNadgeri, Jayprakash, M.1 aGarade, Ajit, C.1 aTambe, Romana, A.1 aGokhale, Suresh, P.1 aRode, Chandrashekhar, V.  uhttps://library.ncl.res.in/content/pd-functionalized-carbon-nanotubes-selective-hydrogenation-2-butyne-14-diol-001851nas a2200253   4500008004100000022001400041245009500055210006900150260007300219300001400292490000800306520089500314653003401209653003001243653003301273653002501306653001601331100002001347700002401367700002401391700002401415700003301439856012501472       2012                        eng d  a0169-433200aEnhancing the hydrogen storage capacity of Pd-functionalized multi-walled carbon nanotubes0 aEnhancing the hydrogen storage capacity of Pdfunctionalized mult  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcFEB  a3405-34090 v2583 a<p>We demonstrate that the hydrogen storage capacity of multi-walled carbon nanotubes can be enhanced by polyvinylpyrrolidone functionalization. The polyvinylpyrrolidone acts as a stabilizing agent for Pd-nanoparticles, reduces their size and facilitates their uniform and enhanced loading onto multi-walled carbon nanotubes. According to sorption studies, the polyvinylpyrrolidone capping and consequent nanostructural modification enables 2.3 times more hydrogen adsorption than mere Pd-functionalization of multi-walled carbon nanotubes. Corresponding morphological changes before and after polyvinylpyrrolidone capping, characterized using Raman Spectroscopy, X-ray diffraction, TEM and thermal analysis techniques, are also presented. The results contribute towards increasing the efficiency of hydrogen based sustainable energy sources. (C) 2011 Elsevier B.V. All rights reserved.</p>10aHydrogen based energy sources10aHydrogen storage capacity10aMultiwalled carbon nanotubes10aPd functionalization10aPVP capping1 aSingh, Priyanka1 aKulkarni, Mukta, V.1 aGokhale, Suresh, P.1 aChikkali, Samir, H.1 aKulkarni, Chandrashekhar, V.  uhttps://library.ncl.res.in/content/enhancing-hydrogen-storage-capacity-pd-functionalized-multi-walled-carbon-nanotubes-002313nas a2200265   4500008004100000022001400041245011400055210006900169260005700238300001200295490000700307520138000314653002301694653001501717653000901732653002701741653002301768100002001791700002301811700002401834700001801858700002301876700002301899856012501922       2013                        eng d  a0361-523500aSynthesis of low coercive BaFe12O19 hexaferrite for microwave applications in low-temperature cofired ceramic0 aSynthesis of low coercive BaFe12O19 hexaferrite for microwave ap  a233 SPRING ST, NEW YORK, NY 10013 USAbSPRINGERcAPR  a761-7680 v423 a<p>Polycrystalline M-type barium hexaferrite (BaFe12O19) samples have been synthesized by solution combustion route at different pH and calcination conditions in order to reduce the coercivity for microwave applications in low-temperature cofired ceramic (LTCC) substrates. Structural, morphological, and magnetic properties of BaFe12O19 were studied by x-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), Raman spectroscopy, vibrating sample magnetometry (VSM), and Mossbauer spectroscopy. The formation of a single-phase hexagonal structure was confirmed by XRD. The Raman spectra reveal all characteristic peaks of BaFe12O19, illustrating the phase purity and crystal lattice symmetry of the synthesized material. Mossbauer spectra illustrate the existence of Fe3+ cations at all five crystallographic lattice sites. The microstructural features observed by FESEM disclose the growth of nanoregime particles into hexagonal platelet particles after calcination at temperatures from 800A degrees C to 1200A degrees C. The VSM results show a lower coercivity (1350 Oe to 3500 Oe) together with reasonably high saturation magnetization (55 emu/g to 60 emu/g) and a high bulk resistivity (&gt; 10(9) Omega-cm) at room temperature. The dependence of magnetic and electrical properties on the preparation and processing conditions is also discussed.</p>10aBarium hexaferrite10acoercivity10aLTCC10aMossbauer spectroscopy10aRaman spectroscopy1 aRane, Vivek, A.1 aMeena, Sher, Singh1 aGokhale, Suresh, P.1 aYusuf, S., M.1 aPhatak, Girish, J.1 aDate, Sadgopal, K.  uhttps://library.ncl.res.in/content/synthesis-low-coercive-bafe12o19-hexaferrite-microwave-applications-low-temperature-0