共查询到20条相似文献,搜索用时 15 毫秒
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二价的配合物3p能级分裂间距大于三价Y的化合物,二价Y的4s多重分裂也是鉴别Y的价态指纹。 相似文献
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有机锗化合物的光电子能谱研究 总被引:2,自引:1,他引:1
用X射线光电子能谱法(XPS)研究了六种有机锗化合物的Ge3d轨道结合能化学位移与锗所处不同化学环境的关系。结果表明,对Ge3d轨道电子能化学位移有明显影响的关键取决于极性基团。 相似文献
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X-ray photoelectron spectroscopy is used as a probe to demonstrate the interaction between cellulose and 1-butyl-3-methylimidazolium chloride. The fitting models of C 1s spectra for the ionic liquid, cellulose and cellulose containing solutions are developed. The measured binding energy of C2 1s component is used to indicate the ionic liquid-cellulose interaction. In the case of the cellulose containing solution, due to the weaker charge-transfer effect between hydrophilic groups of cellulose and the imidazolium cation, the C2 atom is in a more electropositive environment and thus exhibits higher binding energy. 相似文献
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Dr. Elmar Kataev Daniel Wechsler Prof. Federico J. Williams Julia Köbl Dr. Natalia Tsud Dr. Stefano Franchi Prof. Hans-Peter Steinrück Dr. Ole Lytken 《Chemphyschem》2020,21(20):2293-2300
Thin-film growth of molecular systems is of interest for many applications, such as for instance organic electronics. In this study, we demonstrate how X-ray photoelectron spectroscopy (XPS) can be used to study the growth behavior of such molecular systems. In XPS, coverages are often calculated assuming a uniform thickness across a surface. This results in an error for rough films, and the magnitude of this error depends on the kinetic energy of the photoelectrons analyzed. We have used this kinetic-energy dependency to estimate the roughnesses of thin porphyrin films grown on rutile TiO2(110). We used two different molecules: cobalt (II) monocarboxyphenyl-10,15,20-triphenylporphyrin (CoMCTPP), with carboxylic-acid anchor groups, and cobalt (II) tetraphenylporphyrin (CoTPP), without anchor groups. We find CoMCTPP to grow as rough films at room temperature across the studied coverage range, whereas for CoTPP the first two layers remain smooth and even; depositing additional CoTPP results in rough films. Although, XPS is not a common technique for measuring roughness, it is fast and provides information of both roughness and thickness in one measurement. 相似文献
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X射线光电子能谱在材料研究中的应用 总被引:3,自引:0,他引:3
卢炯平 《分析测试技术与仪器》1995,1(1):1-12
X射线光电子能谱(XPS)在材料科学与工程的许多领域中有着广泛的用途.本文将讨论XPS在材料研究的三个方面的应用,即材料表面改性、固体-固体界面体系及材料与环境的相互作用.我们将引用一些具体的例子来说明XPS的应用价值及其研究方法.所讨论的例子将涉及聚合物和氧化物材料的表面改性、化学及物理气相淀积、粘接界面断裂机制、腐蚀及摩擦等领域. 相似文献
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Shuang Men Yujuan Jin 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2018,92(12):2472-2475
Russian Journal of Physical Chemistry A - We investigate the Schrock–Osborn catalyst, [Rh(COD)(PPh3)2][PF6], in a series of ionic liquids by XPS. The electronic environment of the rhodium... 相似文献
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Single-stranded DNA immobilized on an III-V semiconductor is a potential high-sensitivity biosensor. The chemical and electronic changes occurring upon the binding of DNA to the InAs surface are essential to understanding the DNA-immobilization mechanism. In this work, the chemical properties of DNA-immobilized InAs surfaces were determined through high-resolution X-ray photoelectron spectroscopy (XPS) and near-edge X-ray absorption fine structure (NEXAFS). Prior to DNA functionalization, HF- and NH(4)OH- based aqueous etches were used to remove the native oxide from the InAs surface. The initial chemical state of the surface resulting from these etches were characterized prior to functionalization. F-tagged thiolated single-stranded DNA (ssDNA) was used as the probe species under two different functionalization methods. The presence of DNA immobilized on the surface was confirmed from the F 1s, N 1s, and P 2p peaks in the XPS spectra. The presence of salt had a profound effect on the density of immobilized DNA on the InAs surface. To study the interfacial chemistry, the surface was treated with thiolated ssDNA with and without the mercaptohexanol molecule. An analysis of the As 3d and In 3d spectra indicates that both In-S and As-S are present on the surface after DNA functionalization. The amount of In-S and As-S was determined by the functionalization method as well as the presence of mercaptohexanol during functionalization. The orientation of the adsorbed ssDNA is determined by polarization-dependent NEXAFS utilizing the N K-edge. The immobilized ssDNA molecule has a preferred tilt angle with respect to the substrate normal, but with a random azimuthal distribution. 相似文献
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X-Ray and X-ray Photoelectron Spectroscopy Studies of the Electronic Structure of Borane Derivatives
V. D. Yumatov E. A. Il'inchik L. N. Mazalov O. V. Volkov V. V. Volkov 《Journal of Structural Chemistry》2001,42(2):281-295
This paper reviews the results of electronic structure studies of a number of typical members of borane series by X-ray and X-ray photoelectron spectroscopy using quantum chemical calculations. Fragment analysis of the molecular orbital structure is given. The nature of chemical interaction in boron cluster compounds is studied on models: simple molecules NH3, BH3, and BF3 and their adducts NH3BH3 and NH3BF3. The electronic structure of B10H12L2 type compounds with Lewis bases L = NH3, (CH3)2S, (C6H5)3P is analyzed. The complexes are considered in terms of the concept of donor–acceptor interactions between the fragments. The donor–acceptor bond has contributions from both occupied and vacant acceptor orbitals. X-ray photoelectron data on the charged states of atoms in the compounds are overviewed. Electron distribution in complex compounds with transition metals [(1,2-B9C2H11)2M]–, M = FeIII, CoIII, NiIII, and NiIV and chain type polycobaltocarborane anions {[(3)-1,2-B9C2H11]2Co
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[(3,6)-1,2-B8C2H10]n-1}
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, n = 2-7, is considered. 相似文献
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在Ni-MH和Ni-Cd电池制造业中,对钴的价态确定是重要的。高自旋二价钴给出较强的Shake-up伴峰,而三价钴是反磁性的,没有伴峰,由此可以确定钴的价态,并进行定量分析。由实验结果得出下面的经验方程:X%=100(13-20C)/13(C 1)。式中X%是三价钴的百分含量,C是待测样品Co2p1/2Shake-up伴峰与主峰强度之比。此方程可以给出三价钴近似含量。我们从Cop1/2与Shake-up伴峰之间距离或者从伴峰与主峰强度之比,可以鉴别氢氧化亚钴与氧化亚钴。 相似文献
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