Synthesis Carbon and Silicon Materials by Laser Ablation

目前在原子团簇和纳米材料的合成和制备研究中，激光等离子体合成法扮演了一个极其重要的角色，许多突破性的进展都是通过激光等离子体合成法来实现的。如C60及其富勒烯家族的发现，碳纳米管和其他多种类型纳米材料的生成等。因此，我们希望通过建立起脉冲激光溅射合成法，探索一种团簇及材料合成的新的方法途径，并对产物形成的条件和规律进行研究。希望不仅能够合成得到宏量的产物，并且通过对中间产物的研究来解释某些物质的形成机理。 本文创建了脉冲激光溅射合成法，在固相、液相、气相三相共存的反应体系中，利用激光等离子体反应合成得到了不同种类的碳团簇、硅团簇及硅纳米材料。以不同手段对合成产物进行了分离、表征。探讨了富勒烯...Nowadays plasma synthesis by laser ablation plays a very important role among the researches about synthesis and production of clusters and nanomaterials. Many salient progresses in this area were realized by laser plasma synthesis. For example, the discovery of C60 and the family of fullerenes, the production of carbon nanotubes and many kinds of other nanomaterials. So we hope to build a new eff...学位：理学博士院系专业：化学化工学院化学系_无机化学学号：B19982500

C_nD_m~-簇离子的结构特性和形成动力学研究

对较小碳原子簇负离子Ｃ－ｎ结构的研究是从直链向单环乃至双环构型发展的．氢原子在碳原子簇中起着电子给予体的作用［１，２］．但以往的研究未发现碳原子数的奇偶性和氢原子数目对簇离子构型的影响．我们以激光溅射氘代蒽样品，产生了丰富的碳／氢团簇负离子ＣｎＤ－ｍ..

Structural Recombination of Polymethylsilicone Induced by Laser Plasma

[中文文摘]将脉冲激光束在惰性气氛中溅射石墨产生的等离子体,与一维链状聚甲基硅氧烷的蒸气束流反应 ,在产物中通过真空升华和重结晶分离出了两种单晶,经X射线衍射测定为具有 (CH3SiO1.5) n(n =8,10 )组成的硅氧烷,它们均具有多面体的三维笼状构型 .通过色 -质联用还检测到其它硅氧烷化合物,其中某些产物已表征为二维多环的构型.反应结果表明,经由激光等离子体的碰撞和能量传递,反应物的链状结构发生解离和进一步反应,经结构重组形成了多种不同组成和构型的产物。[英文文摘]A special synthetic reaction has been developed, in which vapor of the reactant interacts with the high temperature plasma generated by laser ablating a graphite target. By selecting chained methylsilicone as reactant, a series of methylsilsesquioxanes products with various structural configurations have been obtained. Among them, two products, which were separated by sublimation in high vacuum and recrystalization, were characterized by X-ray crystal diffraction as (CH_3SiO_ 1.5)_n (n=8,10). Both of them are found to have three-dimensional cage structure.In addition,other products with double ring structure were detected by GC-MS analysis.The results demonstrate the potential application of the synthetic reaction.In the reaction described in this article,resulting from the collision and energy-transfer of the laser plasma,chain structure of the reactant dissociated and recombined to give the cage and ring structure of the product.国家自然科学基金重大项目(29890210)资助课

Structural recombination of polymethylsilicone induced by laser plasma

A special synthetic reaction has been developed, in which vapor of the reactant interacts with the high temperature plasma generated by laser ablating a graphite target. By selecting chained methylsilicone as reactant, a series of methylsilsesquioxanes products with various structural configurations have been obtained. Among them, two products, which were separated by sublimation in high vacuum and recrystalization, were characterized by X - ray crystal diffraction as (CH3SiO1.5)(n)(n = 8, 10). Both of them are found to have three - dimensional cage structure. In addition, other products with double ring structure were detected by GC - MS analysis. The results demonstrate the potential application of the synthetic reaction. In the reaction described in this article, resulting from the collision and energy - transfer of the laser plasma, chain structure of the reactant dissociated and recombined to give the cage and ring structure of the products

Synthesis of Perchlorinated Polycyclic Aromatic Hydrocarbon by Laser Ablation

[中文文摘]受Ｋｒａｔｓｃｈｅｒ等［１］电弧法合成Ｃ６０工作的启发,本课题组近年来以独创的液相电弧、微波放电等方法，合成了Ｃ５０及其多种全氯代碎片［２－５］．本文通过我们最近发展的脉冲激光溅射方法在四氯化碳的蒸汽中溅射石墨，得到丰富的克量级产物．这些产物经ＨＰＬＣ－ＵＶ－ＭＳ联用技术，表征为全氯代多环芳烃．其中部分物质含有五元环，可以看作是富勒烯形成过程中产生的全氯代碎片，该研究结果不仅有助于了解富勒烯的形成机理，而且展示了激光溅射合成法应用前景．[英文文摘]By laser ablating graphite in the vapor of tetrachloromethane,a series of perchlorinated polycyclic aromatic hydrocarbons were synthesized.Among them, hexachlorobenzene (C6Cl6), octachloronaphthalene (C10Cl8), octachloroacenaphthylene (C12Cl8), decachloroanthracene (C14Cl10), decachlorophenanthrene (C14Cl10 ), decachloropyrene (C16Cl10 ), decachlorofluoranthene (C16Cl10),C18Cl10, C20Cl10,C22Cl12 and C24Cl12 were identified by HPLC-UV-MS.The results demonstrate the potential of the reaction for synthesizing the compounds with special structures.国家自然科学基金(批准号:29890210

Structural Features and Formation Kinetics of C\-\%n\%D\+-\-\%m\% Cluster Ions

对较小碳原子簇负离子C-n结构的研究是从直链向单环乃至双环构型发展的.氢原子在碳原子簇中起着电子给予体的作用［1，2］.但以往的研究未发现碳原子数的奇偶性和氢原子数目对簇离子构型的影响.我们以激光溅射氘代蒽样品，产生了丰富的碳/氢团簇负离子Cnd-M...By laser ablating of anthracene\|\%d\%\-\{10\} sample, various C\-\%n\%D\+-\-\%m\% and C\+-\-\%n\% cluster anions were generated.The distribution suggests that the structural configuration and stability of the clusters varied with the number of deuterium atoms and the parity of number of carbons.With growing size of the clusters, their structural configuration changes from chain to monocycle, and further to polycycle.The analysis of the distribution also reveals the formation kinetics of the clusters.\=国家杰出青年科学基

Synthesis of perchlorinated polycyclic aromatic hydrocarbon by laser ablation

By laser ablating graphite in the vapor of tetrachloromethane, a series of perchlorinated polycyclic aromatic hydrocarbons were synthesized. Among them, hexachlorobenzene (C-6 Cl-6), octachloronaphthalene (C-10 Cl-8), octachloroacenaphthylene (C-12 Cl-8), decachloroanthracene (C-14 Cl-10), decachlorophenanthrene (C-14 Cl-10), decachloropyrene (C-16 Cl-10), decachlorofluoranthene (C-16 Cl-10), C-18 Cl-10 , C-20 Cl-10 , C22Cl12 and C-24 Cl-12 were identified by HPLC-UV-MS. The results demonstrate the potential of the reaction for synthesizing the compounds with special structures

Structural features and formation kinetics of CnDm- cluster ions

By laser ablating of anthracene-d(10) sample, various CnDm- and C-n(-) cluster anions were generated. The distribution suggests that the structural configuration and stability of the clusters varied with the number of deuterium atoms and the parity of number of carbons. With growing size of the clusters, their structural configuration changes from chain to monocycle, and further to polycycle. The analysis of the distribution also reveals the formation kinetics of the clusters