Results 41 to 50 of about 12,386 (281)

Highly Anisotropic Quasi‐Direct Organic Metal Halide Hybrids: A Platform for Polarization‐Sensitive Optoelectronics

Advanced Materials Technologies, EarlyView.
One‐dimensional C4N2H14PbBr4 is shown to have a quasi‐direct electronic band structure and strongly anisotropic transport with polarized broadband emission. A GW/Bethe–Salpeter excited‐state force formalism, supported by polarized Raman and temperature‐dependent photoluminescence, identifies low–frequency Pb–Br phonons that drive ultrafast exciton self‐
Rijan Karkee, Rafael R. Del Grande, Yeonjoo Lee, Jinkyoung Yoo, Azza Ben‐Akacha, Biwu Ma, Michael T. Pettes, David A. Strubbe   +7 more
wiley   +1 more source

XAFS in the high-energy region

Journal of Synchrotron Radiation, 1998
XAFS (X-ray absorption fine-structure) spectra were measured near K-absorption edges of Ce (40.5 keV), Dy (53.8 keV), Ta (67.4 keV) and Pt (78.4 keV). The blunt K-edge jump due to the finite lifetime of the core hole was observed. This makes it difficult to extract EXAFS (extended X-ray absorption fine-structure) functions at low k values.
Y, Nishihata, O, Kamishima, Y, Kubozono, H, Maeda, S, Emura   +4 more
openaire   +2 more sources

Selective oxidation of methanol to methyl formate over Auδ+-nanogold/amorphous SiO2 catalyst

Cailiao gongcheng
Methyl formate （MF） is an important chemical intermediate. The development of efficient catalysts for the synthesis of MF from methanol is of great significance to C1 chemistry.
ZOU Honglei, GAN Guoyou, TANG Xiuzhi, CHANG Weichun, WU Jian   +4 more
doaj   +1 more source

Decoupling the metal insulator transition and crystal field effects of VO2

Scientific Reports, 2021
VO2 is a highly correlated electron system which has a metal-to-insulator transition (MIT) with a dramatic change of conductivity accompanied by a first-order structural phase transition (SPT) near room temperature.
In-Hui Hwang, Chang-In Park, Sunmog Yeo, Cheng-Jun Sun, Sang-Wook Han   +4 more
doaj   +1 more source

Atomic Tuning of Metal‐Support Interactions for Pathway‐Selective CO2 Photoreduction on TiO2

Advanced Science, EarlyView.
Single‐atom Fe and Cu catalysts anchored on TiO2 steer photocatalytic CO2 reduction toward distinct pathways. Fe sites favor rapid *CO desorption and selective CO formation, whereas Cu sites stabilize *CHO intermediates, enabling deep reduction and C─C coupling. Combined spectroscopy and DFT calculations reveal how metal–support interactions and oxygen
Dongyun Kim, Wonjae Ko, Byoung‐Hoon Lee, Sanghoon Kim, Yun Do Kim, Hyunsoo Ahn, Yoon Jung, Chan Woo Lee, Kug‐Seung Lee, Eunhee Gong, Junho Lee, Minho Kim, Taeghwan Hyeon, Su‐Il In   +13 more
wiley   +1 more source

XAFS investigations of tin nitrides

Journal of Synchrotron Radiation, 2001
Tin nitrides (Sn3N4) prepared by the reaction of Sn-halides with KNH2 in liquid ammonia and a subsequent vacuum annealing procedure were investigated with transmission mode XAFS experiments. While the near edge data suggest the presence of a univalent Sn-compound with a valency close to +4, the analysis of the extended X-ray absorption fine structure ...
Lützenkirchen-Hecht, Dirk, Scotti, Nicole, Jacobs, Herbert, Frahm, Ronald   +3 more
openaire   +3 more sources

Operando Electrochemical Formation of Integrated Ni‐Fe Oxyhydroxide Anode for Durable Anion Exchange Membrane Water Electrolyzer

Advanced Science, EarlyView.
The interfacial stability and activity of Ni‐Fe‐based AEMWE anodes can be directly enhanced by operando voltage‐cycling in a FeOOH‐containing electrolyte. This process simultaneously induces Ni oxidation and Fe incorporation, forming an integrated, porous (Fe, Ni)OOH layer with high conductivity and durability.
Euntaek Oh, Jonghyun Hyun, Hojin Lee, Changsoo Lee, Jang Yong Lee, Dong Wook Lee, Kyunghwa Seok, Jeesoo Park, Susung Kim, Gisu Doo, Hee‐Tak Kim   +10 more
wiley   +1 more source

XAFS in a single macrophage cell

Journal of Synchrotron Radiation, 2001
In this paper, a novel approach using XAFS will be introduced for the study of the problem of cytotoxicity to metal ions. A micro beam from a SR source was used to measure the time-dependent distributions and chemical states of elements in mouse microphages that were cultured in metallic solutions of different concentration.
N, Kitamura, A M, Ektessabi
openaire   +2 more sources

Generating Mechanism of Catalytic Effect for Hydrogen Absorption/Desorption Reactions in NaAlH₄–TiCl₃

Applied Sciences, 2021
The hydrogen desorption and absorption reactions of the complex metal hydride NaAlH4 are disproportionation processes, and the kinetics can be improved by adding a few mol% of Ti compounds, although the catalytic mechanism, including the location and ...
Kazutaka Ikeda, Fumika Fujisaki, Toshiya Otomo, Hidetoshi Ohshita, Takashi Honda, Toru Kawamata, Hiroshi Arima, Kazumasa Sugiyama, Hitoshi Abe, Hyunjeong Kim, Kouji Sakaki, Yumiko Nakamura, Akihiko Machida, Toyoto Sato, Shigeyuki Takagi, Shin-ichi Orimo   +15 more
doaj   +1 more source

Reinforcing Oxygen Activation of Spinel Oxide via Mn─O Covalency Engineering for VOCs Oxidation

Advanced Science, EarlyView.
A MnCo spinel catalyst with weakened Mn─O covalency was synthesized via a hard‐template method. The reduced Mn─O covalency facilitates localized electron redistribution, promoting the activation of both molecular oxygen and lattice oxygen, and thereby enabling the efficient and complete oxidation of VOCs (ethyl acetate, toluene, and propane).
Gan Li, Ruochen Zhou, Qianqian Chen, Guobo Li, Xiang Tu, Fengbo Yu, Wenming Liu, Jian Ji, Honggen Peng   +8 more
wiley   +1 more source