02254nas a2200301 4500008004100000022001400041245012100055210006900176260013200245300001200377490000600389520113200395653003001527653002001557653001601577653001601593653002701609653002301636653001901659653001401678100001701692700001901709700001901728700002401747700002101771700003001792856013001822 2010 eng d a1475-743500aFabrication of homogeneous nanoparticle/nanoneedle BaTiO3 and Ba0.8Sr0.2TiO3 smooth thin films by simple dip coating0 aFabrication of homogeneous nanoparticlenanoneedle BaTiO3 and Ba0 aWORLD TRADE CENTER BLDG, 29 ROUTE DE PRE-BOIS, CASE POSTALE 896, CH-1215 GENEVA, SWITZERLANDbINDERSCIENCE ENTERPRISES LTDcDEC a919-9310 v73 a

Ferroelectric BaTiO3 (BTO) and Ba0.8Sr0.2TiO3 (BSTO) thin film materials have been successfully prepared by sol-gel processing and simple dip coating on glass and silicon supports. Above thin films were characterised by x-ray diffraction (XRD), Raman spectroscopy, photoelectron spectroscopy, thermal analysis, atomic force microscopy (AFM) and spectroscopic ellipsometry. Phase identification of BaTiO3 and Ba0.8Sr0.2TiO3 was performed by XRD. XRD and Raman spectroscopy investigations demonstrate that thc Ba0.8Sr0.2TiO3 film exhibits tetragonal structure. AFM analysis demonstrates the elongated nanospherical particles on glass substrate and nanowires on silicon substrate, which represent a strong influence of the crystallinity of underlying substrate on the grain morphology in this technique. The thin films on both the substrates are uniformly coated without any pinhole to significant area (similar to 2.5 cm(2)), and this method might be extended to large area uniform coating. Spectroscopic ellipsometric measurements reveal the exact thickness, refractive index and extinction coefficient of the thin films.

10abarium strontium titanate10abarium titanate10adip coating10afabrication10aferroelectric material10alarge area coating10ananotechnology10athin film1 aSaini, Mamta1 aVivekanand, K.1 aPoddar, Pankaj1 aMurty, K., V. G. K.1 aThushara, K., S.1 aGopinath, Chinnakonda, S. uhttps://library.ncl.res.in/content/fabrication-homogeneous-nanoparticlenanoneedle-batio3-and-ba08sr02tio3-smooth-thin-films-001879nas a2200253 4500008004100000022001400041245010200055210006900157260007300226300001400299490000800313520098400321653001601305653001901321653001801340653001401358100002101372700002401393700002101417700001901438700002001457700002201477856012601499 2011 eng d a0169-433200aField emission studies of silver nanoparticles synthesized by electron cyclotron resonance plasma0 aField emission studies of silver nanoparticles synthesized by el aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcJUN a7184-71890 v2573 a

Field emission has been studied for silver nanoparticles (25-200 nm), deposited within a cylindrical silver target in an electron cyclotron resonance (ECR) plasma. Particle size distribution was controlled by optimum biasing voltages between the chamber and the target. Presence of non-oxidized silver was confirmed from the X-Ray diffraction analysis; however, thin protective layer of oxide was identified from the selective area electron diffraction pattern obtained with transmission electron microscopy. The silver nanoparticles were seen to exhibit hilly pointed like structures when viewed under the atomic force microscopy (AFM). The emissive properties of these particles were investigated by field emission microscopy. It is found that this technique of deposition is ideal for formation of nanoparticles films on different substrate geometries with size controllability as well as its application to emission devices. (C) 2011 Elsevier B.V. All rights reserved.

10aCold plasma10afield emission10aNanoparticles10athin film1 aPurohit, Vishwas1 aMazumder, Baishakhi1 aBhise, Ashok, B.1 aPoddar, Pankaj1 aJoag, Dilip, S.1 aBhoraskar, S., V. uhttps://library.ncl.res.in/content/field-emission-studies-silver-nanoparticles-synthesized-electron-cyclotron-resonance-001642nas a2200145 4500008004100000245011800041210006900159260000800228300001400236490000600250520107100256100002301327700001901350856012701369 2017 eng d00aFluorescent metal quantum clusters: an updated overview of the synthesis, properties, and biological applications0 aFluorescent metal quantum clusters an updated overview of the sy cDEC a9055-90840 v53 aMetal quantum clusters are evolving as excellent systems for a wide range of biological applications due to their small size (similar to 2 nm), tunable optical properties, including optical absorption, photoluminescence (UV to NIR), nonlinear optical properties (two-photon absorption, two-photon fluorescence, and second/third harmonic generation), ultrafast dynamics (relaxation kinetics, electron-phonon coupling, and radiative emission), and magnetism. These excellent properties have resulted in their use in a broad range of applications, including the sensing of ions (heavy metal ions, anions), biomolecules (proteins, DNA, miRNA, and enzymes), biological cells, diagnosis, and therapy. This article presents an introduction to metal quantum clusters, including a brief history of research in this system and an overview of the existing theories to understand their properties. We also discuss the synthesis methods, the various properties of quantum clusters and present a broad and updated overview of the applications of metal quantum clusters in biology.1 aKhandelwal, Puneet1 aPoddar, Pankaj uhttps://library.ncl.res.in/content/fluorescent-metal-quantum-clusters-updated-overview-synthesis-properties-and-biological01720nas a2200229 4500008004100000022001400041245006400055210006300119260000800182300001600190490000700206520103000213653002101243653001101264653002401275653003001299653000701329100002001336700001901356700001901375856009601394 2022 eng d a0272-884200aFormation of zircon-type DyCrO4 and its magnetic properties0 aFormation of zircontype DyCrO4 and its magnetic properties cSEP a24666-246760 v483 a

The formation mechanism of hydrolytic sol-gel synthesized DyCrO4 with a complexing agent in acidic and basic mediums is thoroughly studied. The role of complexing agents and pH on phase formation temperature is also intensively investigated. The formation temperature for DyCrO4 is similar to 500 degrees C in the absence and presence of complexing agents such as oxalic acid and ethylenediaminetetraacetic acid (EDTA) at pH 10. When critic acid is used, the DyCrO4 forms with Cr2O3 impurity. The crystallite size in the presence of a complexing agent in the basic medium is similar to 55 nm which is small as compared to only ammonia solution. The various reaction modes lead to tetragonal zircon-type DyCrO4 at similar to 500 degrees C, transforming into orthorhombic perovskite DyCrO3 at 800 degrees C. The magnetization curve shows the ferromagnetic behavior of DyCrO4 below transition temperature T-c similar to 21 K. This low T-c makes nanocrystalline DyCrO4 a potential material for cryogenic applications.

10aComplexing agent10aDyCrO410aFormation mechanism10aHydrolytic sol-gel method10apH1 aUghade, Supriya1 aJoshi, Bhavana1 aPoddar, Pankaj uhttps://library.ncl.res.in/content/formation-zircon-type-dycro4-and-its-magnetic-properties02127nas a2200169 4500008004100000022001400041245015200055210006900207260000900276300001600285490000700301520146600308100001801774700001901792700001901811856012701830 2023 eng d a0743-746300aFerroelectric polarization and iron substitution synergistically boost electrocatalytic oxygen evolution reaction in bismuth oxychloride nanosheets0 aFerroelectric polarization and iron substitution synergistically cAUG  a11414-114250 v393 a

Ferroelectric materials have gained significant interestin variouskinds of water splitting, but the study of ferroelectric materialsfor electrocatalytic water splitting is in its infancy. Ferroelectricmaterials have spontaneous polarization below their Curie temperaturedue to dipolar alignment, which results in surface charges. In 2Dferroelectric materials, spontaneous polarization depends on thickness.Herein, we report that thickness-dependent ferroelectric polarizationin 2D nanosheets can also accelerate the oxygen evolution reaction(OER) along with the tailored active surface area of exposed crystallinefacets, which improves the electrocatalytic activity relatively. Iron-substitutedBiOCl nanosheets of varying thickness are fabricated by varying thepH using a facile coprecipitation method. The substituted iron enhancespolarization and electrochemical active sites on the surface. Thefindings in this study show that the exposed (001) facet and higherthickness of the nanosheets have high ferroelectric polarization and,in turn, superior electrocatalytic activity and remarkable stability,requiring low overpotentials (348 mV and 270 mV at 100 mA/cm(2) and 10 mA/cm(2)) in alkaline (1.0 M KOH) electrolyte. Asthe thickness of the nanosheets is decreased from 140 to 34 nm, theelectrocatalytic performance of iron-substituted BiOCl nanosheetsstarts to reduce due to the lower Coulomb-Coulomb interactionand the increasing depolarization.

1 aSingh, Dinesh1 aJoshi, Bhavana1 aPoddar, Pankaj uhttps://library.ncl.res.in/content/ferroelectric-polarization-and-iron-substitution-synergistically-boost-electrocatalytic