聚乙烯膜辐照接枝丙烯酸的XPS表征

用辐照方法,使亲水单体在聚烯烃类高分子材料表面接枝聚合,从而改善这些材料的亲水性,同时也可用这种方法来制备具有所需性能的膜材料(作离子交换膜、反渗透膜等),是一个较热门的研究课题。

聚三甲硅基丙炔膜表面改性的XPS研究——Ⅰ.用N-溴代丁二酰亚胺的表面改性

用N-溴代丁二酰亚胺的丙酮溶液在回流温度下对三甲硅基丙炔的均聚物和共聚物作了表面改性。XPS的研究表明,试样表面层中Br原子含量随溴化时间的增长而增加,C_(IS)谱变宽且产生来自C-O和C-Br结构的新谱线。红外光谱证明溴化反应产生CH_2Br结构。溴化使膜的气透性发生相应的变化,即α_(O_2/N_2)值增高,P_(O_2)值降低。

电子束法沉积ZnIn_2Se_4膜的结构与XPS表征

研究了电子束法沉积ZnIn_2Se_4薄膜的工艺条件,所得致密、均匀膜的导电类型可以通过不同气氛处理得到控制。该膜的最佳参数为:电阻率ρ为2.35×10~(-1)Ω·cm,Hall迁移率μ_H为106cm~2·V~(-1)·S~(-1),载流子浓度N是1.51×10~(17)cm~(-3),禁带宽度E_(?)为2.23eV。采用XPS技术研究了膜的组成、结构、价态。

LnBa_2C_3O_(7-δ)(Ln=Pr、Y)体系的XPS研究

该文研究了YBa_2Cu_3O_(7-δ)和PrBa_2Cu_3O_(7-δ)两体系的XPS谱图,结果表明从XPS图中难以判断三价铜的存在,与YBa_2Cu_3O_(7-δ)体系相比,PrBa_2Cu_3O_(7-δ)体系中Ba的结合能低,O_(18)的两个状态变得模糊不清。讨论了空穴浓度对高T_c超导电性的影响。

LaMn_(1-x)Co_xO_(3-λ)催化剂的XPS研究

用柠檬酸络合法制备了LaMn_(1-x)Co_xO_(3-λ)系列稀土复合氧化物。用XPS技术研究了它的表面、体内组态和结构变化及锰和钴含量对La 3d_(5/2)特征峰和Shske-up伴峰的影响。认为α-O是催化剂中的活性氧种。用氩离子剥离技术研究了LaMn_(1-x)Co_xO_(3-λ)体系,观察到锰在表面的偏析作用随x的减小而增大。

WATER-SOLUBLE AND AMPHIPHILIC POLYMERS .6. A STUDY ON THE SURFACE-COMPOSITION OF CAST FILMS OF PST/PMAA AND PEO-PST-PEO BLOCK POLYMERS BY XPS

Thin films of PSt/PMAA and PEO-PSt-PEO block polymers were deposited on a polystyrene substrate by solution adsorption (with or without solvent treatment), and the film surfaces were characterized by means of XPS. Direct solvent - casting of PEO-PSt-PEO from benzene solutions resulted in PSt-rich surfaces, whereas PMAA richer surfaces were obtained for PSt/PMAA films cast from DMF solutions. Moreover, solvent treatment after casting had profound effect on the film surface composition. Treatment with water markedly increased the surface concentration of polar PEO segments. In the case of PSt-PMAA block polymers, the PSt content on the surface increased in the order of water < ethanol < cyclohexane < petroleum ether, the last-named giving films with almost pure PSt surface. It is well worth noticing that the bulk composition had little to do with the surface composition for both PSt/PMAA and PEO-PSt-PEO block polymers within the composition range investigated when subsequent solvent treatment was applied.

XPS研究等离子体处理的聚苯乙烯表面结构

采用不同功率(10、20、60、100、150W)、时间(0.5、1、3、6、15和30分),在Ar、N_2、O_2、H_2和空气中,对聚苯乙烯(PS)片基进行了等离子体处理。 通过XPS技术、谱图的拟合、差谱分析和Ar~+小功率剖面处理,研究了PS表面组成与结构变化,指出处理的聚苯乙烯表面有C—O、C—NH_2、C=O、COOH和基团嵌入,因而改变了材料特性。

用XPS振起伴峰表征聚苯醚酮的辐射凝胶化剂量

X-射线光电子能谱(XPS)振起(Shake-Up)伴峰主要是伴随主光电子的电离所导致的最高占有轨道到最低未占有轨道电子跃迁的结果.Carlson及Clark的工作声明这种振起伴峰是某些共轭π电子体系的表征,振起伴峰的相对强度与π电子共轭情况有关。 含酚酞侧基聚芳醚酮(PEK-C)是一种新型耐高温工程塑料,其主侧链均带苯环:

PMo_(12-x)V_x和PMo_(12-x)W_x杂多酸的XPS研究 Ⅰ.杂多酸中氧的俄歇谱

用XPS对杂多酸PMo_(12-x) V_x和PMo_(12-x) W_x的研究表明:在用V部分取代Mo时,虽然O1s峰没有给出什么有意义的结构信息,但OKL_(23)L_(23)俄歇跃迁动能随X增大而增大;在W部分取代Mo时,OKL_(23)L_(23)俄歇峰的动能随X增大而减少。杂多酸中酸性与OKL_(23)L_(23)数值有一定的关系。从OKL_1L_1与OKL_(23)L_(23)俄歇峰强度之比,求出氧成键时增加电荷,进一步表明了杂多酸中氧原子成键情况。

杂多酸PMo_(12-x)V_x和PMo_(12-x)W_x的XPS研究 Ⅱ.氧的双电离能及轫致辐射诱导的磷、钼俄歇谱

利用式E_Ⅱ(min)=E_B(K)-E_i(L_(23)~+L_(23)~+)可以从OKL_(23)L_(23)价态型俄歇跃迁能量求出氧的双电离能,它与杂多酸的Bronsted质子酸有一定的对应关系。本文利用铝靶的轫致辐射诱导MoL_3M_(45)M_(45)和PKL_(23)L_(23)俄歇跃迁,实现了在一个阳极和同一次实验情况下,既测得Mo、P特征的电光电子峰,又记录了高动能的俄歇峰。Mo、P的俄歇谱可表明杂原子与杂多配位原子的关系。

用XPS振起伴峰估算含酚酞侧基聚芳醚砜的辐射凝胶化剂量

含酚酞侧基聚芳醚砜(PES—C)是近年来陈天禄等刚刚开发出的一种新型耐高温高分子材料,其结构为:

XPS STUDY ON RARE-EARTH PHTHALOCYANINE COMPLEXES

The rare earth monophthalocyanine complexes, LnPcCl and LnPc(OAc)2 (Ln = Tb, Ho, Tm, Lu, Pc=Phthalocyanine, OAc = Acetate), were synthesized. The electronic structures of the complexes have been studied by means of XPS. The experimental results of binding energies for the complexes indicate that the bonds of the complexes have a certain covalent character depending on L-->Ln charge transfer. This L-->Ln charge transfer process of phythalocyanine complexes differs from that of crown ether complexes. Both coordination and substitution are included in the former case, but only coordination in the latter. Phthalocyanine ring is an electrophilic group and its electronegativity is large. So, the O1s binding energies of coordinating oxygen atoms of acetate in LnPc(OAc)2 are larger than those of Ln(OAc)3. The magnitude of valent charge delocalized from ligand onto metal atom is dependent on electronegativity, coordination number, valence state and so on. Because coordination number of Ln in LnPc(OAc)2 is larger than that in LnPcCl and electronegativity of Clin LnPcCl is larger than that of O in LnPc(OAc)2, the Ln4d5/2 binding energies of LnPc (OAc)2 are less than those of LnPcCl.

XPS STUDY OF CORROSION BEHAVIOUR OF TITANIUM IN H2C2O4 SOLUTION

The corrosion behaviour of titanium substance and the XPS characterization of Ti surface in the H2C2O4 solution have been first studied by X-ray photoelectron spectroscopy, The experimental results show that there am mile Ti-2 and Ti2+ on sample surface in 10% H2C2O4 solution for two boars corrosion at 80 degrees C, but if corrosion is extended to 4 hones, the surface composition is mainly TiO2 with a small amount of Ti2+. This result corresponds to the structure of TiH1.642 composion in sample surface found by XRD analysis. Since bath TiO2 and the surface coating RuO2 are of Gald-Redstone structure, therefore electrode materials of Ti-Ru are stable in chemical industry.

La_(1-x)Sr_xCoO_3的XPS研究 Ⅳ.La_(1-x)Sr_xCoO_3的价态谱

钙钛矿ABO_3复合氧化物用于取代贵金属催化剂的研究工作已取得突破性进展尤其是近几年来在具有钙钛矿结构类型化合物中高临界温度超导材料的发现,更引起国内外学者的重视。对LaCoO_3的结构及各种物化性质的研究已相当多。Lam等用XPS对LaCoO_3一类化合物的价带谱进行过研究,并且与用分子簇、自由离子模型的计算结果进行比较,解释了LaCoO_3的电子结构。我们曾对La_(1-x)Sr_xCoO_3中La与配位体之间的作用,表面氧的状态以及在氢气气氛下钴的还原行为作过研究,但至今对

甲基丙烯酸-苯乙烯嵌段共聚物的XPS研究

对甲基丙烯酸-苯乙烯嵌段共聚物DMF溶液涂制膜(接着经过或不经其它溶剂的处理)的XPS研究表明,共聚物本体组成对膜的表面组成没有明显的影响。从DMF溶液直接涂膜时,按照两相模型,PMAA在表面的面积分数最大可达0.55。在用溶剂处理时,膜表面组成基本上决定于所用溶剂的溶解度参数,PMAA的表面面积分数按下列顺序降低:水>乙醇>环己烷>石油醚。