Topic
Photoemission spectroscopy
About: Photoemission spectroscopy is a research topic. Over the lifetime, 10821 publications have been published within this topic receiving 250888 citations. The topic is also known as: photoelectron spectroscopy & PES.
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TL;DR: In this article, the authors demonstrate that room temperature ferromagnetic ordering can be induced in pristine anatase TiO2 paramagnetic bulk powder through extended hydrogenation by combining x-ray diffraction and photo-emission spectroscopy.
Abstract: In this work, we demonstrate that room temperature ferromagnetism can be induced in pristine anatase TiO2 paramagnetic bulk powder through extended hydrogenation. Defect complexes, Ti3+–VO (Ti3+ ions accompanied by oxygen vacancies) are clearly identified in hydrogenated TiO2 by combining x-ray diffraction and photoemission spectroscopy. The observed ferromagnetic ordering is reversible that can be switched between “on” and “off” by inducing or removing, respectively, these defect complex. We convincingly elucidate that the factors (i) Ti 3d–O 2p hybridization (iii) F+ centers (the electrons in singly occupied oxygen vacancies), and (iii) oxygen vacancy assisted fragmentation of grains, compositely contribute to the ferromagnetic ordering.
68 citations
TL;DR: In this article, the electronic structure of Ca$1-x}$Sr$_x$VO$_3$ using photo-emission spectroscopy was investigated, and the results showed that the high energy-scale of thermal excitations and Coulomb and other electronic interactions were correlated.
Abstract: We investigate the electronic structure of Ca$_{1-x}$Sr$_x$VO$_3$ using photoemission spectroscopy. Core level spectra establish an electronic phase separation at the surface, leading to distinctly different surface electronic structure compared to the bulk. Analysis of the photoemission spectra of this system allowed us to separate the surface and bulk contributions. These results help us to understand properties related to two vastly differing energy-scales, namely the low energy-scale of thermal excitations (~$k_{B}T$) and the high-energy scale related to Coulomb and other electronic interactions.
68 citations
TL;DR: In this article, a green and controllable method was introduced to reduce graphene oxide via a hydrothermal deoxygenation process, and the reduced graphene oxide (RGO) obtained was characterized by atomic force microscopy (AFM), X-ray photoemission spectroscopy (XPS), Fourier transform infrared spectroscope (FTIR), Raman spectroscopic, and UV-Vis absorption spectrography.
Abstract: In this article, a green and controllable method was introduced to reduce graphene oxide (GO) via a hydrothermal deoxygenation process. The reduced graphene oxide (RGO) obtained was characterized by atomic force microscopy (AFM), X-ray photoemission spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, UV–Vis absorption spectroscopy, et al. The reduction degree as well as residual chemical components can be adjusted by changing the reaction time and pH conditions. Both GO and RGO were applied as SERS substrates, and their SERS activities were studied and compared. The mechanism on SERS enhancement of GO and RGOs was discussed. Copyright © 2016 John Wiley & Sons, Ltd.
68 citations
TL;DR: In this article, surface transfer doping of hydrogen-terminated diamond using high electron affinity oxides such as V2O5 is a promising approach for achieving thermally stable, high performance diamond based devices in comparison with air-induced surface conduction channel.
Abstract: Surface transfer doping of hydrogen-terminated diamond has been achieved utilising V2O5 as a surface electron accepting material. Contact between the oxide and diamond surface promotes the transfer of electrons from the diamond into the V2O5 as revealed by the synchrotron-based high resolution photoemission spectroscopy. Electrical characterization by Hall measurement performed before and after V2O5 deposition shows an increase in hole carrier concentration in the diamond from 3.0 × 1012 to 1.8 × 1013 cm−2 at room temperature. High temperature Hall measurements performed up to 300 °C in atmosphere reveal greatly enhanced thermal stability of the hole channel produced using V2O5 in comparison with an air-induced surface conduction channel. Transfer doping of hydrogen-terminated diamond using high electron affinity oxides such as V2O5 is a promising approach for achieving thermally stable, high performance diamond based devices in comparison with air-induced surface transfer doping.
68 citations
TL;DR: In this paper, the chemisorption-site geometries for chlorine on cleaved Si(111) 2\ifmmode\times\else\texttimes\fi{}1 and Ge( 111) 2
Abstract: The chemisorption-site geometries for chlorine on cleaved Si(111) 2\ifmmode\times\else\texttimes\fi{}1 and Ge(111) 2\ifmmode\times\else\texttimes\fi{}1 surfaces have been determined by comparing detailed pseudopotential calculations with energy distribution spectra and polarization selection rules of photoemission spectroscopy. Strong $p$-symmetry polarization effects observed in photoemission allow us to determine that on Si(111) the correct geometry is a onefold covalent site while on Ge(111) the Cl is in a threefold coordinated ionic site.
68 citations