01624nas a2200265 4500008004100000020002200041022001400063245011200077210006900189260013500258300001400393490000900407520061800416653001101034653002401045653002301069653001701092100002401109700002201133700001801155700001501173700002001188700002101208856012901229 2012 eng d a978-0-7354-1044-2 a0094-243X00aNoble metal ions incorporated in lattice points of perovskites - water gas shift activity of BaCe1-xPtxO3-d0 aNoble metal ions incorporated in lattice points of perovskites w a2 Huntington Quadrangle, Ste 1no1, Melville, NY 11747-4501 USAbGovt India, Dept Atom Energy (DAE), Board Res Nucl Sci (BRNS)cJUN a1277-12780 v14473 a

Recently precious metals supported on oxides were reported to be very promising catalysts for the lower-temperature WGS reaction. Here we report the synthesis of platinum doped barium cerate and its use as catalysts for WGS reaction. It has been found that maximum CO conversion was obtained at 350 degrees C which enhanced after the first cycle. XPS analysis shows that after the first cycle more ionic Platinum species are present on the surface of the catalyst. Neutron diffraction at room temperature shows that the oxygen vacancies are in the O2 position and increases with increasing Pt substitution.

10aBaCeO310aNeutron diffraction10aPlatinum catalysis10aWGS reaction1 aJijil, Chamundi, P.1 aRajarajan, A., K.1 aDevi, Nandini1 aMittal, R.1 aChauhan, A., K.1 aMukhopadhyay, R. uhttps://library.ncl.res.in/content/noble-metal-ions-incorporated-lattice-points-perovskites-water-gas-shift-activity-bace1-001692nas a2200169 4500008004100000022001400041245010300055210006900158260011000227300001400337490000700351520098300358100002001341700002001361700001801381856012301399 2012 eng d a1144-054600aNovel porous silica encapsulated Au nanoreactors as peroxidase mimic for one-pot glucose detection0 aNovel porous silica encapsulated Au nanoreactors as peroxidase m aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcDEC a2625-26290 v363 a

The peroxidase family of natural enzymes facilitate H2O2 reduction by one electron transfer through aromatic substrates, if chromogenic, they can be used in the colorimetric detection of H2O2 and subsequently glucose in tandem with glucose oxidase. Au nanoparticles encapsulated within porous silica exhibited peroxidase mimetic activity and kinetic parameter evaluation indicates an excellent affinity for H2O2. It is also shown to have a detection capability for glucose in very low concentrations and could be used for glucose detection in a one-pot assay. The material is synthesised by using cation-ended thiol-stabilised ultra small gold clusters as precursors. Removal of the thiols creates micropores within the silica, making this material unique in that the active centres are protected inside the silica, yet are accessible to reactant molecules. This characteristic makes the material ideal as a detection tool where attrition resistance will be advantageous.

1 aSamanta, Anupam1 aDhar, Basab, B.1 aDevi, Nandini uhttps://library.ncl.res.in/content/novel-porous-silica-encapsulated-au-nanoreactors-peroxidase-mimic-one-pot-glucose-002918nas a2200265 4500008004100000022001400041245008000055210006900135260007100204300001600275490000600291520199700297653001902294653002102313653003102334653002102365653002202386653004402408100001502452700001802467700001802485700002002503700001702523856011202540 2014 eng d a1944-824400aNanostructured donor-acceptor self assembly with improved photoconductivity0 aNanostructured donoracceptor self assembly with improved photoco a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcNOV a19434-194480 v63 a

Nanostructured supramolecular donor-acceptor assemblies were formed when an unsymmetrical N-substituted pyridine functionalized perylenebisimide (UPBI-Py) was complexed with oligo(p-phenylenevinylene) (OPVM-OH) complementarily functionalized with hydroxyl unit and polymerizable methacrylamide unit at the two termini. The resulting supramolecular complex [UPBI-Py (OPVM-OH)](1.0) upon polymerization by irradiation in the presence of photoinitiator formed well-defined supramolecular polymeric nanostructures. Self-assembly studies using fluorescence emission from thin film samples showed that subtle structural changes occurred on the OPV donor moiety following polymerization. The 1:1 supramolecular complex showed red-shifted aggregate emission from both OPV (similar to 500 nm) and PBI (similar to 640 nm) units, whereas the OPV aggregate emission was replaced by intense monomeric emission (similar to 430 nrn) upon polymerizing the methacrylamide units on the OPVM-OH. The bulk structure was studied using wide-angle X-ray diffraction (WXRD). Complex formation resulted in distinct changes in the cell parameters of OPVM-OH. In contrast, a physical mixture of 1 mol each of OPVM-OH and UPBI-Py prepared by mixing the powdered solid samples together showed only a combination of reflections from both parent molecules. Thin film morphology of the 1:1 molecular complex as well as the supramolecular polymer complex showed uniform lamellar structures in the domain range <10 rim. The donor-acceptor supramolecular complex [UPBI-Py (OPVM-OH)](1.0) exhibited space charge limited current (SCLC) with a bulk mobility estimate of an order of magnitude higher accompanied by a higher photoconductivity yield compared to the pristine UPBI-Py. This is a very versatile method to obtain spatially defined organization of n and p-type semiconductor materials based on suitably functionalized donor and acceptor molecules resulting in improved photocurrent response using self-assembly.

10adonor-acceptor10ahydrogen bonding10aoligo(p-phenylenevinylene)10aPerylenebisimide10aphotoconductivity10asupramolecular polymeric nanostructures1 aSaibal, B.1 aAshar, A., Z.1 aDevi, Nandini1 aNarayan, K., S.1 aAsha, S., K. uhttps://library.ncl.res.in/content/nanostructured-donor-acceptor-self-assembly-improved-photoconductivity-002351nas a2200193 4500008004100000022001400041245011700055210006900172260011000241300001600351490000600367520155200373100002401925700002401949700001801973700001801991700002402009856012402033 2014 eng d a2040-336400aNitrogen-doped graphene interpenetrated 3D Ni-nanocages: efficient and stable water-to-dioxygen electrocatalysts0 aNitrogendoped graphene interpenetrated 3D Ninanocages efficient  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcSEP a13179-131870 v63 a

Herein, we report the synthesis of a nitrogen-doped graphene (NGr) interpenetrated 3D Ni-nanocage (Ni-NGr) electrocatalyst by a simple water-in-oil (w/o) emulsion technique for oxidation of water to dioxygen. Correlation of adsorption of NGr and subsequent interpenetration through the specific surface plane of nickel particles as well as the concomitant interaction of N and C with Ni in the nano-regime has been investigated. Apart from the benefits of the synergistic interactions between Ni, N, and C, the overall integrity of the structure and its intra-molecular connectivity within the framework help in achieving better oxygen evolution characteristics at a significantly reduced overpotential. The engineered Ni-NGr nanocage displays a substantially low overpotential of similar to 290 mV at a practical current density of 20 mA cm(-2) in 0.1 M KOH. In comparison, NGr and Ni-particles as separate entities give overpotentials of similar to 570 and similar to 370 mV under similar conditions. Moreover, the long term stability of Ni-NGr was investigated by anodic potential cycling for 500 cycles and an 8.5% increment in the overpotential at 20 mA cm(-2) was observed. Additionally, a chronoamperometric test was performed for 15 h at 20 mA cm(-2), which highlights the better sustainability of Ni-NGr under the actual operating conditions. Finally, the quantitative estimation of evolved oxygen was monitored by gas chromatography and was found to be 70 mmol h(-1) g(-1) of oxygen, which is constant in the second cycle as well.

1 aDhavale, Vishal, M.1 aGaikwad, Sachin, S.1 aGeorge, Leena1 aDevi, Nandini1 aKurungot, Sreekumar uhttps://library.ncl.res.in/content/nitrogen-doped-graphene-interpenetrated-3d-ni-nanocages-efficient-and-stable-water-000802nas a2200217 4500008004100000245010800041210006900149260000800218300001800226490000600244100002400250700002400274700002800298700002100326700002800347700002300375700001700398700002800415700001800443856012300461 2016 eng d00aNitrogen doping in oxygen-deficient Ca2Fe2O5: a strategy for efficient oxygen reduction oxide catalysts0 aNitrogen doping in oxygendeficient Ca2Fe2O5 a strategy for effic cNOV a34387–343950 v81 aJijil, Chamundi, P.1 aLokanathan, Moorthi1 aChithiravel, Sundaresan1 aNayak, Chandrani1 aBhattacharyya, Dibyendu1 aJha, Shambhu, Nath1 aBabu, P., D.1 aKakade, Bhalchandra, A.1 aDevi, Nandini uhttps://library.ncl.res.in/content/nitrogen-doping-oxygen-deficient-ca2fe2o5-strategy-efficient-oxygen-reduction-oxide