XPS研究中几种参数对CdS中Cd 3d结合能的影响

本文着重从仪器本身参数方面和样品方面讨论了由于各参数的不同，对电子结合能的影响。通过半导体ＣｄＳ膜的研究，探讨了Ｃｄ　３ｄ５／２，Ｃｄ　３ｄ３／２特征峰结合能的变化规律，分析了这种变化在测试中带来的影响。

STUDIES ON THE PEROVSKITE-TYPE MIXED CATALYSTS OF TITANIUM SYSTEM FOR OXIDATIVE COUPLING OF METHANE - THE INFLUENCE OF CALCINATION TEMPERATURE

The correlations of the calcination temperature, structure and catalytic activity for the oxidative coupling of methane on the LiLa0.5Ti0.5O2+lambda catalysts whose main phase and major active phase is Perovskite-type ternary complex oxide LaTi1-yLiyO3-lambda have been studied. The surface and bulk structures of the catalysts were characterized by means of XRD, XPS, IR, BET and so on, The results cleary indicated that the effect of calcination temperature on the activity for the oxidative coupling of methane is twofold. On one hand, it is favorable for Li+ substitution for Ti3+ to enter into the lattice of LaTiO3 and produce more oxygen vacancies in which active oxygens are formed; however, excessively high calcination temperature make the amount of Li+ substitution for Ti3+ lower, due to a little change of structure or phases for the catalyst. On the other hand, the conversion of CH4 drops because of the decrease of surface area, when the calcination temperature is raised.

STUDY ON THE NON-STIOCHIOMETRIC SNO2-X NANOCRYSTALLINE MATERIAL BY XRD, XPS AND ESR

Nonstiochiometric SnO2-x nanocrystalline material were successfully prepared through Sol-Gel process using anhydrous stannic chloride and iso-propyl alcohol. TEM observation shows that the mean diameter of the powder sintered at 700 degrees C for 2 hours is about 20 nm. By the investigation of XRD and ESR, we can conclude that the sample sintered at 300 degrees C for 2 hours was amorphous and it grew into nanocrystalline with the oxygen vacancies and defects when sintered at 700 degrees C for 2 hours. Using these conclusion, the ESR signals and the difference between the two SnO2-x samples are explained.

非化学计量比SnO_(2-x)纳米微晶材料的XRD,XPS和ESR研究

采用溶胶凝胶法,以无水四氯化锡及异丙醇为原料,制得非化学计量比的SnO_(2-x)纳米微晶材料.透射电镜图片显示700℃焙烧2h得到的粉体的粒度为20nm,由X射线衍射及X射线光电子能谱的分析可知,300℃焙烧2h得到颗粒边界部分原子无规排布的纳米粉体,而700℃焙烧2h得到的是晶格趋于完整的纳米微晶,它们都存在氧空位及晶格缺陷,利用这些结论可以解释SnO_(2-x)纳米微晶材料中出现的顺磁信号.

复合氧化物LaMn_(1-x)Fe_xO_3(x=0-1)的XPS研究

用XPS方法研究了具有ABO3结构的LaMn1-xFexO3（x＝0－1）氧化物的氧化还原性能、表面组成和吸附氧种．样品经还原和再氧化处理后，Mn2p和Fe2p结合能的变化对Fe和Mn之间发生的氧化还原提供了明显的证据．可表示如下：Me4＋＋Fe（3－δ）→Mn（4－δ）＋＋Fe3＋通过计算机用三种氧物种（OⅠ，OⅡ和OⅢ）对O1s峰进行拟合，确定了每种氧物种的状态．同时，以氧物种含量随还原、再氧化的变化，确定了发生在表面上的氧化还原反应同OⅠ和OⅡ吸附氧物种有关．在此基础上，对吸附位与氧之间的电子转移过程进行了讨论.

Study of Methane Oxidative Coupling over Ti-La-Li Mixed Oxides

The composition and structures of Li-Ti-La mixed oxides as well as their catalytic activity for methane oxidative coupling have been studied by means of XRD XPS, IR, SEM and so on. The results indicate that by changing x value in Li-La1-xTixO2 oxides phas

XPS Study of the Oxygen State in LaMnyCo1-yO3 Catalysts

A series of LaMnyCo1-yO3 compounds were prepared by the complexation method with citric acid. XPS was used to investigate the oxygen state in perovskite-type (ABO(3)) Complex oxide LaMnyCo1-yO3 catalysts. The result showed that three oxygen species (alpha

Bi－Mo－Nb复合氧化物催化作用机理的ESR和XPS研究

用ＥＳＲ对比研究了掺杂Ｎｂ对α－Ｂｉ２Ｍｏ３Ｏ（１２）催化剂丙烯还原和氧再氧化的影响，并用ＸＰＳ原位Ａｒ＋溅射研究了催化剂的还原与再氧化过程，观察了上述过程中催化剂内金属离子的价态变化和晶格氧的扩散现象。提出了Ｂｉ－Ｍｏ间通过晶格氧扩散所发生的氧化还原作用及模型，探讨了Ｎｂ（５＋）取代Ｍｏ（６＋）产生的氧空位对加速晶格氧扩散所起的作用。

聚四氟乙烯微粉辐照接枝苯乙烯的XPS研究

聚四氟乙烯微粉辐照接枝苯乙烯的ＸＰＳ研究许观藩，罗云霞，杨弘（中国科学院长春应用化学研究所，长春，１３００２２）关键词聚四氟乙烯，苯乙烯，表面接枝，ＸＰＳ用辐照方法在疏水性高聚物材料表面接枝聚合亲水性单体，可以达到改性的目的．文献中所用的高聚物材料包...

EBD法制备ZnIn_2Te_4薄膜的性质与XPS研究

用电子束加热沉积法（EBD）制备了厚度420um的ZnIn2ZTe4薄膜。研究了最佳成膜工艺条件和性能，用电子能谱（XPS）分析了ZuIn2Te4薄膜的组成、结构和状态；典型ZnIn2Te4膜最佳参数为：电阻率ρ为3．2×10－1Ω·cm，Hall迁移率是79cm2V－1s－1，载流子浓度是1．58×1017cm－3，禁带宽度（Eg）是2．33eV；探讨了ZuIn2Te4膜导电机理，制作了ZuIn2Te4－Si太阳能电池。

等离子体改性聚丙烯纤维表面的XPS研究

用等离子体技术处理了聚丙烯纤维表面．用Ｘ－射线光电子能谱（ＸＰＳ）研究了聚合物表面的元素组成、相对含量的变化、表面官能团的类型．采用曲线拟合分峰技术对谱图进行数学处理，结果表明：尽管处理气氛不同，聚丙烯纤维表面除含有Ｃ—Ｈ和Ｃ＝Ｃ键外，还引入了Ｏ、Ｎ元素．形成活性基团：－ＯＨ、＞Ｃ＝Ｏ、－ＣＯＯＨ、－ＮＨ２和－ＣＯＮＨ２等，提高了聚合物表面活性。

UNSTEADY DIFFUSION KINETICS OF ZIEGLER-NATTA HETEROGENEOUS CATALYST POLYMERIZATION .4. PREDICTION OF EXPERIMENTAL RESULTS OF PROPYLENE ETHYLENE 1-HEXADECENE TERPOLYMERIZATION

The prediction, based on unsteady diffusion kinetics, of the enhancement of reactivity and incorporation of 1-hexadecene in its copolymerization with propylene on adding a small amount of ethylene (increase from 5,2 mol-% to 10,8 mol-% when 2% of ethylene was added, and to 16,1 mol-% when 5% was added) was verified in the terpolymerization of propylene/1-hexadecene/ethylene on a commercial Solvay-type delta-TiCl3 catalyst. The catalyst efficiency was thus also increased. These augmentations originate from the increase in diffusion coefficient of 1-hexadecene at the catalyst surface when the PP crystallinity decreases on introduction of ethylene. Calculation based on unsteady diffusion kinetics showed that the order of diffusion coefficients ethylene > propylene > 1-hexadecene is reversed as the monomer concentration increases when the monomers are not at their equilibrium concentration. Sequence distribution as determined by means of C-13 NMR revealed a tendency of blocky structure rather than a Bernoullian one. The terpolymer compositions obtained by means of an IR method developed in this work conform rather well with the NMR results. Results in this work not only support the unsteady diffusion kinetics but also provide a new route to prepare olefinic copolymer rubbers with heterogeneous titanium catalysts.