A cobalt telluride/reduced graphene oxide (CoTe/RGO) hybrid is synthesized by hydrothermal method and used as counter electrode in dye-sensitized solar cell (DSSC). The synthesized samples are characterized by field emission scanning electron microscopy and transmission electron microscope, whic...
Nickel telluride (NiTe) and cobalt telluride (CoTe) nanocrystallites were synthesized from homogeneous reaction mixtures of tartrate complex of Ni2+/Co2+ and Te4+ at room temperature by reduction with sodium borohydride. The morphology and the structure of the synthesized particles were characte...
Rational structure design and component-controlled synthesis are attractive and challenging methods to develop materials with unique function for renewable energy conversion such as hydrogen production via water splitting. The earth-abundant and affordable transition metals have been regarded as...
In this report, cobalt telluride (CoTe) is synthesized in a water-oil heterogeneous system, and CoTe film fabricated by spin-coating method is applied as platinum (Pt) -free counter electrode for dye-sensitized solar cells. Field emission scanning electron microscopy finds that CoTe counter elec...
A confocal Raman system combined with a high-temperature furnace cell has been established to monitor the formation of cobalt silicides. This system enables the quasi in situ study of the influence of temperature, annealing duration, and oxygen impurities on phase transformation. The experimenta...
Thin films of cobalt silicide are widely used as metallization in very large-scale integrated electronic circuits. In this study, Co ions were deposited on Si(1 1 1) wafers by a high beam current filter metal vacuum arc deposition (FMEVAD) system. Surface silicide films were formed after anneali...
Ternary cobalt–nickel silicide films were prepared using magnetron sputtering from an equiatomic cobalt–nickel alloy target on Si substrate. The effect of post-deposition annealing on the phase formation, structural properties and resistivity of the resultant films has been studied. The result...
Cobalt catalytic-layers 25 nm were deposited by sputtering on silicon substrates. At the pretreatments, hydrogen plasma was conducted for 4–16 min at 600 °C in a MPCVD system. Pretreated samples were characterized using SEM and AFM. Surface morphologies of catalytic-layers were changed after ...
Cobalt silicide has emerged as a leading contact material in silicon technology due to its low resistivity, high stability and small lattice mismatch. In this study, 0.2–0.4 μm thick Co films were deposited on Si(1 0 0) wafers by RF magnetron sputtering at room temperature, and annealed at tem...
Silicide formation in Co/Si thin structures synthesized using thermal evaporation, sputter deposition and ion implantation, has been investigated using depth-resolved positron annihilation spectroscopy (PAS) together with other corroborative experimental techniques. S vs. Ep curves and S–W corr...
We have used scanning tunneling microscopy (STM) and ab initio total-energy calculations to characterize surface and interfacial structure of Co-Si(111) system. It has been found experimentally that two different types of the (2×2) surface structures occur. The coexistence of two phases is demo...
Co-Ti system was prepared on Si (1 0 0) substrates using an electron beam evaporator equipped with thickness monitor. Co (10 nm) thin film was deposited on top of pre-deposited Ti (10 nm) film at 0.6 Å/sec deposition rate. First three samples were then argon and vacuum annealed at temperatures b...
Cathodic polarisation curves and impedance spectra for cobalt silicides Co2Si and CoSi2 in 0.5–2 M KOH at ambient temperature were obtained. It was shown that electrocatalytic activity of both silicides in hydrogen evolution reaction (HER) is higher than that of cobalt. The dependences of equiv...
Intercalation synthesis of graphene-capped cobalt silicides has been studied in situ by core-level photoelectron spectroscopy with synchrotron radiation and low-energy electron diffraction. It is found that at 400 °C the intercalation of graphene/Ni(1 1 1) with cobalt takes place in a wide rang...
The development of efficient, sustainable, cheap and safe methods for the synthesis of hydrogen peroxide is a very important challenge from the environmental viewpoint, since H2O2 can be used as a solar fuel or for degradation of organic, inorganic and biologic pollutants from wastewater. Effici...
Lightly cobalt-modified, Aurivillius-type, sodium bismuth titanate (Na0.5Bi4.5Ti4O15, NBT) ceramics were synthesized by substituting a small amount of cobalt ions onto the Ti4+ sites using conventional solid-state reaction. X-ray photoelectron spectroscopy (XPS) analysis coupled with bond valenc...
Bismuth layer-structured ferroelectric (BLSF) strontium bismuth titanate (SrBi4Ti4O15, SBT) ceramic oxides with B-site cobalt substitutions have been synthesized using conventional solid–state reaction. The dielectric, piezoelectric, and ferroelectric properties of cobalt-modified SBT are inves...
We prepared and characterized a new type of photocatalyst, referred to as cobalt-deposited titanate nanotubes, using TiO2 (P25) as the precursor through a two-step process (hydrothermal reaction at 150 °C followed by calcination at 600 °C). The optimal catalyst (Co-TNTs-600) was obtained at a ...
In the present work, multilayered sensing films were prepared by sol–gel spin coating process using precursor solutions of cobalt oxide and cobalt titanate. Cobalt oxide films were annealed at 150, 300 and 450 °C respectively; however, the films of cobalt titanate were annealed at 450 °C. XRD...
Ultra-thin cobalt ferrite films have been synthesised on ferroelectric barium titanate crystals. The cobalt ferrite films exhibit a magnetic response to strain induced by structural changes in the barium titanate substrate, suggesting a pathway to multiferroic coupling. These structural changes ...
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