02405nas a2200265 4500008004100000022001400041245016100055210006900216260006900285300001200354490000700366520141600373653001701789653002101806653002701827653001301854100002301867700002301890700001801913700001701931700002001948700002001968700002401988856012702012 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

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.

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. uhttp://library.ncl.res.in/content/gradual-transitions-morphology-diamond-films-grown-using-n-2-admixtures-ch4h-2-gas-hot-102218nas a2200229 4500008004100000022001400041245009200055210006900147260009200216300001200308490000600320520138900326653001301715653001801728653001101746653000901757653002901766100001601795700002201811700003001833856012501863 2009 eng d a1533-488000aN,S-Co-doped TiO2 Nanophotocatalyst: synthesis, electronic structure and photocatalysis0 aNSCodoped TiO2 Nanophotocatalyst synthesis electronic structure  a26650 THE OLD RD, STE 208, VALENCIA, CA 91381-0751 USAbAMER SCIENTIFIC PUBLISHERScJAN a423-4320 v93 a

N,S-co-doped anatase-phase TiO2 (N,S-TiO2) nanophotocatalysts were prepared from either benzothiazoline or aminothiol with titanium isopropoxide followed by a systematic thermal decomposition. The chemical nature of S and N in N,S-TiO2 have been identified by XPS to be sulfate and NO-like, respectively. A significant band broadening and red-shift in the UV-visible absorption spectrum of N,S-TiO2 suggests a band gap reduction compared to TiO2. A maximum band-gap narrowing of 0.22 +/- 0.02 eV was observed on N,S-TiO2. Higher energy width observed on N,S-TiO2 is in contrast to 0.13 eV from N-doped TiO2 indicating the sulfate-like species might play a major role in narrowing the band-gap to a Higher level. It is confirmed that the oxidation of N and S to NO and SO42- occurs in the final stage of preparation of N,S-TiO2, during calcination in air. It is predicted that the oxygen associated with sulfate and NO structural features could be crucial in bringing down the energy gap and red shift in optical absorption and the role of sulfur is to facilitate the above. Photocatalytic decomposition of methylene blue has been carried out on N,S-TiO2 shows higher activity than the commercial TiO2 in the visible region. However, sulfate species seems to enhance the activity of N,S-TiO2 marginally compared to N-TiO2, and possible suggestions are given to improve the same.

10anitrogen10aPhotocatalyst10aSulfur10aTiO210aVisible Light Absorption1 aSathish, M.1 aViswanath, R., P.1 aGopinath, Chinnakonda, S. uhttp://library.ncl.res.in/content/ns-co-doped-tio2-nanophotocatalyst-synthesis-electronic-structure-and-photocatalysis-001607nas a2200217 4500008004100000022001400041245010200055210006900157260007700226300001200303490000600315520081200321653002801133653001301161653001101174653001401185653002201199100001501221700003001236856012301266 2014 eng d a1867-388000aNOx reduction at near ambient temperatures and under lean-burn conditions on modified pd surfaces0 aNOx reduction at near ambient temperatures and under leanburn co aBOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANYbWILEY-V C H VERLAG GMBHcFEB a531-5370 v63 a

Palladium surfaces that are modified with O atoms in the subsurface broaden the NO reduction temperature regime up to 325 K with O-2-rich NO+H-2+O-2 compositions. Compared to virgin Pd surfaces, up to 150% higher deNO(x) catalytic activity was observed with modified Pd surfaces at the reaction maximum. Molecular beam instrument and ambient-pressure photoelectron spectroscopy were employed to follow the kinetic and surface changes. These results open up a possibility to realize the cold-start reduction of NOx (deNO(x)). DeNO(x) activity reported in the literature with supported Pd catalysts after a simple calcination in air compares well with our present observations. Surface modification is likely to demonstrate a high potential for other catalytic reactions at relatively low temperatures.

10aheterogeneous catalysis10anitrogen10aoxygen10aPalladium10asurface chemistry1 aRoy, Kanak1 aGopinath, Chinnakonda, S. uhttp://library.ncl.res.in/content/nox-reduction-near-ambient-temperatures-and-under-lean-burn-conditions-modified-pd-0