01886nas a2200229   4500008004100000022001400041245012300055210006900178260000800247300001100255490000600266520108400272653002201356653003901378653002701417100001901444700002401463700001801487700001301505700001801518856012001536       2014                        eng d  a2053-159100aFacile gamma radiolytic synthesis of synergistic Co3O4-rGO nanocomposite: direct use in photocatalytic water splitting0 aFacile gamma radiolytic synthesis of synergistic Co3O4rGO nanoco  cDEC  a0455070 v13 a<p>Nanostructured Co3O4 was synthesized through a gamma (gamma)-radiolysis technique using alcoholic (iso-propanol) salt solutions of cobalt ions with and without suspended graphene oxide (GO) nanoparticles, respectively. Formation of Co3O4 accompanied with GO reduction takes place simultaneously (in situ) upon.-ray exposure carried out at a rate of 5.1 KGy h(-1). Reduction of GO and formation of Co3O4 were confirmed by XRD, Raman and UV-vis spectroscopy. XRD and HRTEM results supports the embedding of nano-crystalline Co3O4 in an amorphous matrix. Relatively larger crystallites of cobalt oxide obtained in the presence of rGO proved to be a decisive supporting material for the directional growth of Co3O4. Electrochemical characterization established the fact that rGO is indeed considered as a proficient medium for electrochemical electron transfer process. Photo-assisted H-2 generation studies using Co3O4 and Co3O4-rGO nano-composite yielded 3 and 30 mu mol h(-1) g(-1) of hydrogen (H-2) generation, respectively, supports the action of rGO as an electron trap.</p>10anano cobalt oxide10aphotocatalytic hydrogen production10aReduced graphene oxide1 aGupta, Bhavana1 aMelvin, Ambrose, A.1 aMatthews, Tom1 aDash, S.1 aTyagi, A., K.  uhttps://library.ncl.res.in/content/facile-gamma-radiolytic-synthesis-synergistic-co3o4-rgo-nanocomposite-direct-use02605nas a2200265   4500008004100000022001400041245018700055210006900242260006900311300001200380490000800392520159400400653002401994653002602018653001202044653001502056100001902071700001902090700002402109700002102133700001802154700001802172700001802190856013102208       2014                        eng d  a0254-058400aPoly (3,4-ethylenedioxythiophene) (PEDOT) and poly (3,4-ethylenedioxythiophene)-few walled carbon nanotube (PEDOT-FWCNT) nanocomposite based thin films for Schottky diode application0 aPoly 34ethylenedioxythiophene PEDOT and poly 34ethylenedioxythio  aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcOCT  a867-8770 v1473 a<p>Transparent, conductive films of poly (3,4-ethylenedioxythiophene) (PEDOT) and poly (3,4-ethylenedioxythiophene)-few walled carbon nanotube (PEDOT-FWCNT) nanocomposite were synthesized by in-situ oxidative polymerization and investigated for their Schottky diode property. The prepared films were characterized by UV-Vis spectroscopy, thermal gravimetric analysis (TGA), surface resistivity, cyclic voltametery, scanning electron microscopy (SEM) and high resolution transmission electron microscopy (HRTEM). SEM reveals the formation of homogeneous and adhesive polymer films while HRTEM confirms the uniform wrapping of polymer chains around the nanotube walls for PEDOT-FWCNT film. Improved thermal stability, conductivity and charge storage property of PEDOT in the presence of FWCNT is observed. Among different compositions, 5 wt. % of FWCNT is found to be optimum with sheet resistance and transmittance of 500 Omega sq(-1) and 77%, respectively. Moreover, the electronic and junction properties of polymer films were studied and compared by fabricating sandwich type devices with a configuration of Al/PEDOT or PEDOT-FWCNT nanocomposite/indium tin oxide (ITO) coated glass. The measured current density-voltage characteristics show typical rectifying behavior for both configurations. However, enhanced rectification ratio and higher forward current density is observed in case of PEDOT-FWCNT based Schottky diode. Furthermore, reliability test depicts smaller hysteresis effect and better performance of PEDOT-FWCNT based diodes. (C) 2014 Elsevier B.V. All rights reserved.</p>10aComposite materials10aElectrical properties10aPolymer10aThin films1 aGupta, Bhavana1 aMehta, Minisha1 aMelvin, Ambrose, A.1 aKamalakannan, R.1 aDash, Sitaram1 aKamruddin, M.1 aTyagi, A., K.  uhttps://library.ncl.res.in/content/poly-34-ethylenedioxythiophene-pedot-and-poly-34-ethylenedioxythiophene-few-walled-carbon-002482nas a2200265   4500008004100000022001400041245010400055210006900159260010600228300001400334490000700348520153200355653002101887653001901908653001901927653002701946653000901973100001901982700002402001700001802025700001402043700001802057700001802075856012302093       2015                        eng d  a0360-319900aFacile gamma radiolytic methodology for TiO2-rGO synthesis: effect on photo-catalytic H-2 evolution0 aFacile gamma radiolytic methodology for TiO2rGO synthesis effect  aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcMAY  a5815-58230 v403 a<p>TiO2 (P25) decorated reduced graphene oxide (rGO) is synthesized by gamma-radiolytic technique using water-ethanol solvent medium. Visible light absorpdon was confirmed by UV-Visible spectroscopy. Photoluminescence (PL) study revealed a decline in electron-hole recombination rate signalled by a sharp fall in luminescence of TiO2. Under such scenario, electron transfer from TiO2 conduction band to the conjugated sheet becomes a preferred pathway in the presence of rGO, which is further confirmed by photocurrent measurement. TiO2 -rGO composite with 1 wt. % rGO was found to be the best composition in terms of visible light absorption, while retaining TiO2 crystallinity. Transmission electron microscopy and Raman spectroscopic studies confirmed the coating of rGO sheet with TiO2 nanoparticles. TiO2 -rGO was found to show about 150 times higher photocatalytic H-2 generation under 250 W UV-Visible light irradiation than pristine TiO2. In addition to this, TiO2 -rGO composite shows hydrogen production yield of 35 mu mol/h.g under visible light (lambda = 400 nm) irradiation. Thus gamma-radiolysis can be considered to be a viable technique, which helps in synthesizing photocatalytically active nanocomposite with high H-2 evolution rate. In the light of these interesting aspects, a detail investigation is carried out to study the effect of rGO concentration and illumination time on photocatalytic yield. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.</p>10agamma-radiolysis10aH-2 production10aPhotocatalysis10aReduced graphene oxide10aTiO21 aGupta, Bhavana1 aMelvin, Ambrose, A.1 aMatthews, Tom1 aDhara, S.1 aDash, Sitaram1 aTyagi, A., K.  uhttps://library.ncl.res.in/content/facile-gamma-radiolytic-methodology-tio2-rgo-synthesis-effect-photo-catalytic-h-2-002575nas a2200277   4500008004100000022001400041245018000055210006900235260011200304300001400416490000700430520146700437653001401904653001601918653003001934653003201964653003501996653001402031100002102045700002102066700002202087700002002109700001802129700001902147856013102166       2015                        eng d  a0019-452200aNovel 2,6-diformyl-4-methyl phenol based chemosensor for Zn-II ion by ratiometric displacement of Cd-II ion and its application for cell imaging on human melanoma cancer cells0 aNovel 26diformyl4methyl phenol based chemosensor for ZnII ion by  a5-A, NEW PALI RD, PO BOX 91, NEAR HOTEL TAJ HARI MAHAL, JODHPUR, 342 003, INDIAbSCIENTIFIC PUBL-INDIAcNOV  a1729-17450 v923 a<p>A new chelating ligand [4-methyl-2,6-bis-(pyridin-2-yl-hydrazonomethyl)-phenol] (1) was prepared by the condensation of 2-hydrazinylpyridine with 2,6-diformyl-p-cresol. Compound 1 exhibits weak fluorescence due to intramolecular photoinduced electron transfer (PET). The sensor (1) demonstrates Zn2+-specific emission enhancement due to ``PET off'' process through a 1 : 1 binding mode with the metal ion. The fluorescence quantum yield of the chemosensor 1 is only 0.020, and it increases more than 14-fold (0.280) in the presence of one equivalent of the zinc ion. Interestingly, the introduction of other metal ions causes the fluorescence intensity to remain either unchanged or weakened except for Cd2+. Ratiometric displacement of Cd2+ ion from the complex by Zn2+ ion supports the formation of more stable sensor-Zn2+ complex over the sensor-Cd2+ complex. The experimental findings have been correlated with theoretical results using B3LYP functional and 6-31G(d,p), LANL2DZ basis set for Cd2+ (2) and Zn2+ (3) complex, respectively, by Density Functional Theory (DFT) method. Moreover, the ability of probe 1 to sense Zn2+ within human melanoma cancer cells has been explored, and the Zn2+-probing process in living cells was reversible. [Mn-2(PHMP)(2)](ClO4)(2) (4) and [Ni-2(PHMP)(H2O)(5)](NO3)(3) (5) have been also synthesized and characterized crystallographically and spectroscopically to understand the ligating behavior of the ligand PHMP.</p>10aCd-II ion10aChemosensor10aDensity functional theory10ahuman melanoma cancer cells10aphotoinduced electron transfer10aZn-II ion1 aMitra, Debarshan1 aVenkatathari, N.1 aSabharwal, S., C.1 aGodbole, S., V.1 aTyagi, A., K.1 aDas, Sangbrita  uhttps://library.ncl.res.in/content/novel-26-diformyl-4-methyl-phenol-based-chemosensor-zn-ii-ion-ratiometric-displacement-cd-102119nas a2200253   4500008004100000022001400041245008000055210006900135260010600204300001400310490000700324520123900331653002201570653002401592653001801616653001901634653000901653100001901662700002401681700001801705700001801723700001801741856010601759       2016                        eng d  a1364-032100aTiO2 modification by gold (Au) for photocatalytic hydrogen (H-2) production0 aTiO2 modification by gold Au for photocatalytic hydrogen H2 prod  aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcMAY  a1366-13750 v583 a<p>TiO2 is indeed one of the widely used semiconductors employed for photocatalytic hydrogen production. Most of its photocatalytic activity-is achieved in its crystalline form. However, its photocatalytic activity is limited to ultraviolet region. For making TiO2 visible light active; Au deposition is strongly recommended due to its surface plasmon feature. Au deposition enhances the photocatalytic activity of both crystalline and nanocrystalline TiO2. Efficiency of photocatalytic activity is controlled by shape and size of Au nanoparticle subsequently the synthetic methodology plays an important role. Herein, we furnish a brief description of TiO2-Au nanocomposite synthesis by different methods viz. sol-gel, photodeposition, deposition-precipitation simple reducing method and dispersion method. A discussion on physical properties of the resultant material is also provided. Three different types of mechanism has been described depending on the type of irradiation and form of TiO2 (crystalline and nanocrytalline). A comparative hydrogen production yield is also tabulated to get an idea about the best synthesis methodology and form of TiO2 for efficient photocatalysis. (C) 2016 Elsevier Ltd. All rights reserved.</p>10aGold nanoparticle10aHydrogen generation10aNanocomposite10aPhotocatalysis10aTiO21 aGupta, Bhavana1 aMelvin, Ambrose, A.1 aMatthews, Tom1 aDash, Sitaram1 aTyagi, A., K.  uhttps://library.ncl.res.in/content/tio2-modification-gold-au-photocatalytic-hydrogen-h-2-production-0