Topic
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: In this paper, a local atomic structure analysis of the interface between chemical vapor-deposited SiO2 and 4H-SiC was achieved via a combination of chemical-state-selective X-ray absorption spectroscopy and the use of a sample with a very thin oxide film.
Abstract: A local atomic structure analysis of the interface between chemical vapor-deposited SiO2 and 4H-SiC was achieved via a combination of chemical-state-selective X-ray absorption spectroscopy and the use of a sample with a very thin oxide film. The Si K-edge spectrum, which monitors the SiC-assigned Auger peak, allows the SiC side of the SiO2/SiC interface to be selectively measured through the SiO2 film. We estimate the coordination number of the first nearest neighbor to be reduced by 17% with respect to the SiC bulk. This suggests that C vacancy defects exist at the SiC side of the interface.
8 citations
TL;DR: In this article, the chemical nature of the deposited iodine has been determined by X-ray photoelectron spectroscopy to be a metal iodide by correlating I 3d binding energies with those obtained from well characterised standards.
8 citations
TL;DR: In this paper, a static secondary ion mass spectrometry (SSIMS) has been developed into a technique which is able to provide the power of SSIMS for the chemical characterization of surfaces.
Abstract: The analysis of the surface chemistry of organic materials or of organic molecules at surfaces presents special problems. Firstly there is the requirement of high chemical specificity and the ability to detect small differences in chemical state. Secondly, organics are very sensitive to damage by the radiation used for the analysis. Over recent years, static secondary ion mass spectrometry (SSIMS) has been developed into a technique which is able to provide the power of mass spectrometry for the chemical characterization of surfaces. Furthermore, the advent of time-of-flight mass spectrometry techniques has enabled very high sensitivity with little sample damage. The power of the technique is illustrated by its application to four areas of surface investigation: the adsorption and reaction of propene at a ruthenium single crystal surface; the interaction of organic lubricants at a synthetic `gold' surface; the interaction of bioactive molecules at a model cell membrane surface, and the identification of contamination responsible for adhesive failure.
8 citations
TL;DR: In this article, the X-ray photoelectron spectroscopy (XPS) study on as deposited as well as 500°C annealed Co (400 A)/Si thin film synthesized by electron beam evaporation technique under UHV conditions is reported.
8 citations
TL;DR: In this paper, the effect of Al3+ substitution into nanocrystalline cobalt ferrite that was prepared via a thermal treatment method was investigated and the average ferrite nanoparticle diameters were found to be in the range between 5.86 and 15.91 nm when polyvinylpyrrolidone (PVP) was used as a capping agent.
8 citations