Topic
Cobalt
About: Cobalt is a research topic. Over the lifetime, 69899 publications have been published within this topic receiving 1242058 citations. The topic is also known as: Co & Element 27.
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TL;DR: In this paper, a cobalt oxide thin film electrode was grown on copper substrate from an aqueous alkaline bath containing cobalt chloride as cobalt source by adopting simple and inexpensive chemical deposition method and characterized for structural and morphological studies.
216 citations
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TL;DR: In this paper, the gas sensing characteristics and the morphology of cobalt oxide thin films were investigated using X-ray diffraction analysis (XRD), scanning electron microscope (SEM) and Rutherford backscattering (RBS).
Abstract: The gas sensing characteristics and the morphology of cobalt oxide thin films have been investigated. The thin films were prepared by reactive electron beam evaporation of cobalt on “pure” and surface-oxidised silicon wafers respectively followed by an additional thermal treatment. Structural and morphological analyses of the thin Co3O4 films were performed by X-ray diffraction analysis (XRD), scanning electron microscope (SEM) and Rutherford backscattering (RBS). Two gas-sensitive parameters of the Co3O4 films were investigated: the shift of the work function and change of conductivity during gas exposure. The gas measurements were carried out with ammonia, methane, carbon monoxide, hydrogen, chlorine (only GasFET) and nitric dioxide as test gases in synthetic air at different humidities. The work function measurements were carried out with suspended gate GasFETs as transducer, the resistive measurements with single chip thin-film sensor arrays.
216 citations
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20 Jul 2009TL;DR: In this paper, a process for the selective production of ethanol by vapor phase reaction of acetic acid over a hydrogenating catalyst composition to form ethanol is disclosed and claimed, and an embodiment of this reaction is presented.
Abstract: A process for the selective production of ethanol by vapor phase reaction of acetic acid over a hydrogenating catalyst composition to form ethanol is disclosed and claimed. In an embodiment of this invention reaction of acetic acid and hydrogen over either cobalt and palladium supported on graphite or cobalt and platinum supported on silica selectively produces ethanol in a vapor phase at a temperature of about 25O0C.
215 citations
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TL;DR: A number of discrete binary molybdenum oxides have been characterized after reactions at 200°C and pressures ranging from 1 atm to 10−6 Pa.
Abstract: Surface oxidation reactions of cobalt, molybdenum and mixed cobalt–molybdenum metals have been investigated using x-ray photoelectron spectroscopy (XPS). The oxide stoichiometries have been determined from XPS intensity measurements. Such quantification has been important in identifying oxide compositions with characteristic XPS spectra. A number of discrete binary molybdenum oxides have been characterized after reactions at 200°C and pressures ranging from 1 atm to 10−6 Pa. At the lowest pressure, the Mo 3d spectra and O/Mo ratios suggest the formation of a molybdenum–oxygen structure with a stoichiometry near unity. By contrast, at higher pressures, oxides that are predominantly MoO2 and MoO3 appear, but other intermediate oxide structures are also identified. Well-defined binary oxides of cobalt can be prepared from cobalt metal after heating in oxygen at different pressures. New binary oxides of cobalt and molybdenum have been generated by the reaction on MoO3 or Co3O4 substrates. Oxidation of a thin film of molybdenum on a Co3O4 substrate has been shown to produce a nearly stoichiometric surface layer of CoMoO4. The procedure could be useful for the production of other ternary oxides of possible interest for use as XPS reference materials.
215 citations
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215 citations