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Chemical state
About: Chemical state is a research topic. Over the lifetime, 2378 publications have been published within this topic receiving 78183 citations.
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TL;DR: The initial composition and chemical state of nanopowder primary particles obtained by grinding natural diamond and detonation synthesis have been studied by X-ray photoelectron spectroscopy as discussed by the authors.
Abstract: The initial composition and chemical state of nanopowder primary particles obtained by grinding natural diamond and detonation synthesis have been studied by X-ray photoelectron spectroscopy. It has been shown that the primary particles of both nanopowders contain mainly carbon and oxygen atoms. The signals from nitrogen, sulfur, chlorine, and metal atoms in the photoelectronic spectrum do not exceed the noise level. It has been discovered that the proportions of carbon atoms are ∼46.5 and ∼67.8% in the state of the sp3 hybridization, ∼26.8 and ∼17.4% in the state of the sp2-hybridization, and ∼26.7 and ∼14.7% in the composition of the oxygen-containing functional groups in the primary particles of the nanopowders obtained by detonation synthesis and by grinding natural diamond, respectively.
4 citations
TL;DR: In this paper, a linear relationship was obtained between the implanted dose and the normalized Auger signal intensity, and the importance of the chemical effects in quantitative Auger analysis has also been demonstrated by evaluating a phosphorus sensitivity factor specific to each chemical state of the matrix.
4 citations
TL;DR: In this article, mixed WO3/WS2 powders were prepared by oxidation of WS2, and the physical properties of the samples were characterized by X-ray diffraction, diffuse reflectance spectroscopy, and scanning electron microscopy; they were strongly dependent upon the time and temperature of oxidation.
Abstract: Mixed WO3/WS2 powders were prepared by oxidation of WS2. The physical properties of the samples were characterized by X-ray diffraction, diffuse reflectance spectroscopy, and scanning electron microscopy; they were strongly dependent upon the time and temperature of oxidation. The chemical state and the elemental distribution of the sample surface were investigated by X-ray photoelectron spectroscopy. The photocatalytic results have showed that the aqueous suspensions of the mixed WO3/WS2 systems have significantly higher activities than pure WS2 and WO3 for the photodegradation of phenol. The enhanced performance can be related to the presence of heterojunctions WO3/WS2 on the single particles. The best results were obtained when the surface WS2 molar fraction was about 0.5.
4 citations
TL;DR: In this paper, a surface characterization tool was used to investigate the chemical state and subtle radiation damage on a thick insulator surface, where the difference in Au 4f peak shift due to the surface charging at each pixel, where a Au adlayer of approximately 15 A thickness was formed on the surface to overcome the serious charging shift of the peak position and the spectral deterioration in the photoelectron spectra.
Abstract: We report a surface characterization tool that can be effectively used to investigate the chemical state and subtle radiation damage on a thick insulator surface. It has been used to examine the MgO surface of a plasma display panel (PDP) consisting of a stack of insulator layers of approximately 51 µm thickness on a 2-mm-thick glass plate. The scanning photoelectron microscopy (SPEM) image of the insulating MgO surface was obtained by using the difference in Au 4f peak shift due to the surface charging at each pixel, where a Au adlayer of approximately 15 A thickness was formed on the surface to overcome the serious charging shift of the peak position and the spectral deterioration in the photoelectron spectra. The observed contrast in the SPEM image reveals the chemical modification of the underlying MgO surface induced by the plasma discharge damage. The chemical state analysis of the MgO surface was carried out by comparing the Mg 2p, C 1s and O 1s photoemission spectra collected at each pixel of the SPEM image. We assigned four suboxide phases, MgO, MgCO3, Mg(OH)2 and Mg1+, on the initial MgO surface, where the Mg(OH)2 and Mg1+ phases vanished rapidly as the discharge-induced surface damage began.
4 citations
TL;DR: In this article, the microstructures of the organic-inorganic composite coatings were observed by transmission electron microscopy (TEM) and the chemical states of Cr were investigated by the total electron yield X-ray absorption near edge structure (TEY-XANES) method.
4 citations