02034nas a2200181   4500008004100000245013800041210006900179260000800248300001400256490000700270520135100277100001601628700001901644700001801663700002201681700002301703856012601726       2016                        eng d00aControllable synthesis of SnO2 photocatalyst with superior photocatalytic activity for the degradation of methylene blue dye solution0 aControllable synthesis of SnO2 photocatalyst with superior photo  cMAY  a1138-11550 v113 aSnO2 photocatalyst was successfully synthesised by novel chemical route in hydrothermal environment and annealed at two different temperatures viz 550 and 600 degrees C, respectively. The crystal structure, optical properties, surface and bulk morphology have been characterised using various tools like X-ray diffraction (XRD), UV visible spectroscopy, Fourier transform infrared spectroscopy, transmission electron microscope (TEM) and scanning electron microscope (SEM). Cubic, spheres and porous like morphology of SnO2 photocatalyst was successfully confirmed using SEM micrographs and TEM. In addition to this the photocatalytic activity was evaluated towards the degradation of methylene blue dye solution. SnO2 photocatalyst annealed at 600 degrees C exhibits excellent photocatalytic efficiency which may be attributed to the unique morphology, high crystalline nature and charge separation. The photocatalyst efficiency was further tested towards the concentration of dye, catalyst dosage and pH of the dye. The involvement of center dot OH in the photocatalytic reaction was evidenced using trapping experiment by employing different scavengers. The photocatalyst was moderately active, stable upto its fifth usage and stability of the photocatalyst before and after the photocatalytic reaction was also been studied using XRD and SEM.1 aPrakash, K.1 aKumar, Senthil1 aPandiaraj, S.1 aSaravanakumar, K.1 aKaruthapandian, S.  uhttps://library.ncl.res.in/content/controllable-synthesis-sno2-photocatalyst-superior-photocatalytic-activity-degradation02343nas a2200277   4500008004100000245009800041210007000139260000800209300001000217490000800227520145200235653002001687653002101707653002101728653001701749653001701766653001901783653001901802100001601821700001801837700001701855700001501872700001501887700002301902856014001925       2017                        eng d00aFacile synthesis of β-functionalized “push-pull” Zn(II) porphyrins for DSSC applications0 aFacile synthesis of βfunctionalized pushpull ZnII porphyrins for  cDEC  a56-660 v1473 a<p>Three new β-substituted “push-pull” Zn(II) porphyrin dyes with various electron donors at meso-positions and cyanoacetic acid as acceptor at β-position have been designed and synthesized. These porphyrins have been characterized by UV-Vis, Fluorescence, 1H NMR and 13C NMR spectroscopic techniques and cyclic voltammetric studies. The Soret and Q band of Zn(II) porphyrin dyes were found to be red-shifted (30–35 nm) as compared to ZnTPP. The fluorescence quenching and the decrement in quantum yield and lifetime suggest intramolecular charge transfer from donor to acceptor. Zn porphyrins exhibited anodic shift in their first redox potentials (0.03–0.11 V) as compared to ZnTPP. The HOMO-LUMO energy levels of Zn porphyrin dyes were compared with the conduction band of TiO2 and the electrolyte I−/I3 −. The HOMO levels of all the dyes are sufficiently higher than the energy level of electrolyte I−/I3 − and LUMO levels significantly lower than the conduction band of TiO2 which reflect the feasibility of facile electron-transfer. ZnT(Mes)P(CN-COOH) has been co-sensitized with N719 dye to further improve the PCE efficiency. These dyes displayed power conversion efficiency (PCE) of η = 1.72–3.13% where co-sensitized ZnT(Mes)P(CN-COOH) (N719) dye demonstrated maximum PCE efficiency up to 5.35%, with a Jsc of 11.8 mA cm−2, a Voc of 630 mV and a fill factor (FF) of 72% due to better light harvesting capacity.</p>10acharge transfer10aConduction Bands10aCyanoacetic Acid10aElectrolytes10aFloorescence10aRedox Reaction10azinc compounds1 aPrakash, K.1 aManchanda, S.1 aSudhakar, V.1 aSharma, N.1 aSankar, M.1 aKrishnamoorthy, K.  uhttps://library.ncl.res.in/content/facile-synthesis-%CE%B2-functionalized-%E2%80%9Cpush-pull%E2%80%9D-znii-porphyrins-dssc-applications