Topic
Chemical state
About: Chemical state is a research topic. Over the lifetime, 2378 publications have been published within this topic receiving 78183 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this paper, an iron oxide thin film grown with atomic layer deposition for a gas sensor application was investigated, and the results indicated that the film has a granular structure and that it has grown mainly on the glass substrate leaving the platinum electrodes uncovered.
77 citations
TL;DR: In this article, the initial stages of oxide formation were studied in situ by AES and X-ray photoelectron spectroscopy (XPS) at low oxygen pressures, while the in-depth composition of the generated oxide layer was obtained by sputter depth profiling.
76 citations
TL;DR: In this paper, temperature-dependent x-ray photoelectron spectroscopy was used to investigate local chemical states and thermal stabilities of N dopants in ZnO:N film.
Abstract: Local chemical states and thermal stabilities of N dopants in ZnO:N film are investigated by temperature-dependent x-ray photoelectron spectroscopy. Different types of N local states are detected, including N2 molecules occupying O sites [(N2)O], –NO species, substitutional N atoms in O- and N-rich local environments (α- and β-NO). Compared to the β-NO, the α-NO shows a better thermal stability up to 723 K. However, the transformation from α-NO acceptor to undesirable (N2)O donor occurs above 743 K. The variation of N local states also affects Zn and O binding energies. Photoluminescence studies indicate the shallow acceptor nature of α-NO.
76 citations
TL;DR: In this article, a ligand-free method based on absorption-precipitation process is developed to fabricate Ir/CeO2 nano-catalysts for CO2 hydrogenation reaction.
Abstract: A one-step ligand-free method based on absorption-precipitation process is developed to fabricate Ir/CeO2 nano-catalysts. It is observed that Ir species have strong metal-support interaction (SMSI) with the cerium oxide substrate. Depends on the loading of Ir, the chemical state of iridium could be finely tuned. In CO2 hydrogenation reaction, it was shown that the chemical state of iridium species, induced by SMSI, has a major impact on the reaction selectivity. Ir/Ce catalyst (20% Ir) with relatively large particle size and almost pure metallic iridium species shows high selectivity towards methane. And Ir/Ce catalysts with lower iridium loading (5% and less), with the chemical state of iridium strongly modulated and partially decorated with oxygen, have almost 100% selectivity towards CO. This study shows the potential of tuning the surface chemistry of metal catalyst by substrate and thus to control the selectivity of a catalytic reaction towards designated direction.
76 citations
TL;DR: In this article, the structural ordering of ultra-thin Al-oxide films, as grown by dry, thermal oxidation for various oxidation times within the temperature range of 373-773 K, has been investigated by chemical state analysis using X-ray photoelectron spectroscopy (XPS).
76 citations