02253nas a2200289 4500008004100000022001400041245009500055210006900150260000800219300000900227490000700236520135300243653002001596653001801616653001901634653001401653100001701667700001801684700002201702700001901724700001901743700001601762700002101778700001901799700001901818856012601837 2017 eng d a1432-848800aConcurrent synthesis of SnO/SnO2 nanocomposites and their enhanced photocatalytic activity0 aConcurrent synthesis of SnOSnO2 nanocomposites and their enhance cJAN a9-170 v213 a

The SnO/SnO2 nanocomposites were synthesized using semisolvothermal reaction technique. These nanocomposites were prepared using different combination of solvents viz., ethanol, water, and ethylene glycol at 180 A degrees C for 24 h. The synthesized nanocomposites were analyzed with various characterization techniques. Structural analysis indicates the formation of tetragonal phase of SnO2 for the sample prepared in ethanol, whereas for other solvent combinations, the mixture of SnO and SnO2 having tetragonal crystal structures were observed. The optical study shows enhanced absorbance in the visible region for all the prepared SnO/SnO2 nanocomposites. The observed band gap was found to be in the range of 3.0 to 3.25 eV. Microstructural determinations confirm the formation of nanostructures having spherical as well as rod-like morphology. The size of nanoparticles in ethanol-mediated solvent was found to be in the range of 5 to 7 nm. Thermogravimetric analysis indicate the weight gain around 1.3 wt% confirming the conversion of SnO to SnO2 material. The photocatalytic activity of synthesized nanocomposites was evaluated by following the aqueous methylene blue (MB) degradation. The sample prepared in ethylene glycol-mediated solvent showed highest photoactivity having apparent rate constant (K-app) 0.62 x 10(-2) min(-1).

10aDye-degradation10aNanocomposite10aPhotocatalysis10atin oxide1 aRoy, Animesh1 aArbuj, Sudhir1 aWaghadkar, Yogesh1 aShinde, Manish1 aUmarji, Govind1 aRane, Sunit1 aPatil, Kashinath1 aGosavi, Suresh1 aChauhan, Ratna uhttps://library.ncl.res.in/content/concurrent-synthesis-snosno2-nanocomposites-and-their-enhanced-photocatalytic-activity01985nas a2200229 4500008004100000245010700041210006900148260000800217300002800225490000800253520119900261100001901460700001801479700002101497700002001518700001801538700002001556700001801576700001901594700002001613856012201633 2017 eng d00aSynthesis of gamma-WO3 thin films by hot wire-CVD and investigation of its humidity sensing properties0 aSynthesis of gammaWO3 thin films by hot wireCVD and investigatio cMAY aArticle Number: 16007170 v2143 aIn this study, monoclinic tungsten oxide (gamma-WO3) have been grown in a single step using HW-CVD method by resistively heating W filaments in a constant O-2 pressure. The formation of gamma-WO3 was confirmed using low angle-XRD and Raman spectroscopy analysis. Low angle-XRD analysis revealed that as-deposited WO3 film are highly crystalline and the crystallites have preferred orientation along the (002) direction. HRTEM analysis and SAED pattern also show the highly crystalline nature of WO3 with d spacing of similar to 0.38 nm, having an orientation along the (002) direction. Surface topography investigated by SEM analysis shows the formation of a uniform and homogeneous cauliflower like morphology throughout the substrate surface without flaws and cracks. A humidity sensing device incorporating WO3 is also fabricated, which shows a maximum humidity sensitivity factor of similar to 3954% along with a response time of similar to 14 s and a recovery time of similar to 25 s. The obtained results demonstrate that it is possible to synthesize WO3 in a single step by HW-CVD method and to fabricate a humidity sensor by using it. (C) 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim1 aJadkar, Vijaya1 aPawbake, Amit1 aWaykar, Ravindra1 aJadhavar, Ashok1 aDate, Abhijit1 aLate, Dattatray1 aPathan, Habib1 aGosavi, Suresh1 aJadkar, Sandesh uhttps://library.ncl.res.in/content/synthesis-gamma-wo3-thin-films-hot-wire-cvd-and-investigation-its-humidity-sensing01783nas a2200241 4500008004100000022001500041245006600056210006500122260000800187300001400195490000700209520104800216100002501264700001901289700002101308700002001329700001801349700001801367700002401385700001801409700001901427856009501446 2018 eng d a 1530-437X00aEvaluation of humidity sensor based on PVP-RGO nanocomposites0 aEvaluation of humidity sensor based on PVPRGO nanocomposites cNOV a9097-91040 v183 a

his paper describes the humidity sensing properties of one step in situ synthesized poly (N-vinyl pyrrolidone)- reduced graphene oxide (PVP-RGO) nanocomposites. Different PVP-RGO nanocomposites were obtained by varying PVP/GO weight %ratio as x/50 mg, wherein x = 25, 50, and 75 mg, respectively. The real-time adsorption kinetics of the water molecules during the humidity sensing were also discussed using Elovich model, pseudo first and second order equations. The increase in humidity response of 1.5 PVP-RGO nanocomposite is attributed to the presence of large amount of oxygen functionalities. The above observation was corroborated using spectroscopic analysis. The optimized PVP-RGO nanocomposite showed faster response kinetics with response and recovery times of 10 and 20 s, respectively. The present humidity sensor shows remarkable linearity over the range of 20-90%RH. More specifically, sensitivity was correlated with oxygen functionalities created due to variation of PVP during the functionalization of RGO nanosheets.

1 aBhangare, Bhagyashri1 aJagtap, Shweta1 aRamgir, Niranjan1 aWaichal, Rupali1 aMuthe, K., P.1 aGupta, S., K.1 aGadkari, Sanjay, C.1 aAswal, D., K.1 aGosavi, Suresh uhttps://library.ncl.res.in/content/evaluation-humidity-sensor-based-pvp-rgo-nanocomposites01862nas a2200217 4500008004100000245013700041210006900178260000800247490000800255520106100263100002001324700002001344700002601364700001901390700002101409700002101430700002201451700001901473700002001492856013201512 2019 eng d00aDetection of toxic metal ions Pb2+ in water using SiO2@Au core-shell nanostructures: A simple technique for water quality monitoring0 aDetection of toxic metal ions Pb2 in water using SiO2Au coreshel cOCT0 v7323 a

The present paper demonstrates a development of simple, sensitive and selective optical probe for detection of Pb2+ ions in water using monodispersed silica-gold core-shell nanostructures (SiO2@Au NSs). Structural and elemental analysis confirms the phase purity of nanostructures. The SPR studies for SiO2 @Au NSs reveals, linear dynamic range for Pb2+ ions detection, in the concentration range of 100 ppb to 2 ppm, with detection limit of 100 ppb, which is 5 times higher than AuNPs. Cross sensitivity study confirm its selectivity towards Pb2+ ions over other metal ions. XPS analysis shows the interaction of Pb2+ ions with core-shell NPs.

1 aDaware, Krishna1 aKasture, Manasi1 aKalubarme, Ramchandra1 aShinde, Rakesh1 aPatil, Kashinath1 aSuzuki, Norihiro1 aTerashima, Chiaki1 aGosavi, Suresh1 aFujishim, Akira uhttps://library.ncl.res.in/content/detection-toxic-metal-ions-pb2-water-using-sio2au-core-shell-nanostructures-simple-technique02565nas a2200265 4500008004100000022001400041245010600055210006900161260000800230300001400238490000700252520168100259653002001940653001901960653003401979653001702013653001802030653001702048100002002065700002002085700001402105700001902119700002902138856013202167 2020 eng d a1947-293500aNonenzymatic glucose detection in human serum using Ni nanoparticles decorated reduced graphene oxide0 aNonenzymatic glucose detection in human serum using Ni nanoparti cAUG a1125-11360 v123 a

Reduced Graphene oxide (RGO) decorated with Ni nanoparticles (NiNPs) composites, have been successfully synthesized using a simple hydrothermal method and possessing excellent electrocatalytic activity towards glucose oxidation. The morphological and structural features of RGO-Ni nanocomposites were characterized by field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) and energy dispersive spectroscopy (EDS). From TEM, we observed that NiNPs were anchored on RGO sheets. Cyclic Voltammetric (CV) study revealed that the electrocatalytic activity of RGO-Ni nanocomposite with 20% Ni loading (RGONi-20) towards glucose oxidation is better than that shown by bare Glassy Carbon Electrode (GCE), RGO, bare NiNPs, RGONi10 and RGONi-30. The prepared nanocomposites exhibited fast electrocatalytic response (<5 s) towards glucose oxidation. Amperometric study indicates that the present glucose sensor have exhibited excellent performance by offering a lowest detection limit as 5.1 mu M, with linier range from 2 to 5000 mu M and high sensitivity of 896.67 mu A mM(-1) cm(-2). Interference from different anticipatable electroactive substances such as ascorbic acid (AA), uric acid (UA) and dopamine (DA) is not observed. Furthermore, the application of the as prepared sensor was successfully demonstrated for the detection of glucose in human serum and results were comparable to presently used nonenzymatic technique. RGONi-20 nanocomposite electrode holds great promise for the development of biosensors and other electrochemical devices.

10aElectrochemical10aGlucose Sensor10aGraphene-Nickel Nanoparticles10ahydrothermal10aNanocomposite10aNonenzymatic1 aWaichal, Rupali1 aBhirud, Ashwini1 aFouad, H.1 aGosavi, Suresh1 aAshokkumar, Muthupandian uhttps://library.ncl.res.in/content/nonenzymatic-glucose-detection-human-serum-using-ni-nanoparticles-decorated-reduced-graphene02199nas a2200313 4500008004100000022001400041245010900055210006900164260000900233300001100242490000600253520118600259653000801445653001801453653001901471653001101490653003201501100001801533700001901551700002801570700002301598700001901621700003401640700002001674700001601694700002101710700002501731856012901756 2024 eng d a2515-765500aPhotocatalytic CO2 reduction to syngas using nickel phosphide-loaded CdS under visible light irradiation0 aPhotocatalytic CO2 reduction to syngas using nickel phosphideloa cAPR  a0250190 v63 a

Photocatalytic CO2 reduction is a sustainable pathway to produce syngas (H-2 + CO), which is a key feedstock for the production of several important liquid fuels on the industrial scale. However, achieving an appropriate tunable ratio of H-2:CO in syngas for commercial purposes is a challenging task. In this work, we present a low-cost and non-noble metal, phosphide-based co-catalyst-Ni2P-loaded cadmium sulfide (CdS) photocatalyst system, for photocatalytic CO2 reduction. As a co-catalyst, Ni2P fosters an efficient charge separation of photoexcited charges generated in the CdS production of syngas. In total, 3 wt.% Ni2P/CdS exhibited exceptional performance of 50.6 mu mol g(-1) h(-1) in the CO evolution rate and 115 mu mol g(-1) h(-1) in the H-2 evolution rate, with a syngas composition varying from 2 to 4 in the H-2:CO ratio. Furthermore, first-principles density functional theory calculations were performed to study the surface energetics of the catalyst system and the results are found to be consistent with our experimental findings. Indeed, they establish that the composite favors CO2 photoreduction into syngas more efficiently than pure surfaces.

10aCdS10aCO2 reduction10aPhotocatalysis10aSyngas10atransition metal phosphides1 aYadav, Poonam1 aKumar, Santosh1 aVelankanni, Nandhakumar1 aKuehne, Thomas, D.1 aGosavi, Suresh1 aRaghupathy, Ramya, Kormath Ma1 aBhosale, Reshma1 aHeld, Georg1 aShelke, Manjusha1 aOgale, Satishchandra uhttps://library.ncl.res.in/content/photocatalytic-co2-reduction-syngas-using-nickel-phosphide-loaded-cds-under-visible-light