检索结果-南通市图书馆

Assessment of Defects and collapsed Sites in Self-Assembled Alkanethiol Monolayer on Gold by cyclic Voltammetry and ***

chinese chemical Letters 1998年第12期9卷 0-0,0-0页

作者： Diao, P Jiang, DL cui, XL Gu, DP Tong, RT Zhong, B chinese Acad Sci Inst Coal Chem Taiyuan 030001 Peoples R China Hebei Teachers Univ Dept Chem Shijiazhuang 050016 Peoples R China

Self-assembly of octadecyl mercaptan on gold was investigated by cyclic voltammetry(cV) and electrochemical impedance spectroscopy (EIS). Results of cV experiments show thatthere are no structUral defects exposed directly to the redox couple in solution, but EISexperiments indicate that collapsed sites exist in the monolayer. A method to estimate the degree ofdisorder in the Au/thiol monolayer surface is proposed by using admitta.c. plane plot.

关键词： Self-assembled monolayer cyclic voltammetry a.c. impedance ideally polarizable electrode surface roughness

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Synthesis and Electrical characterization of Doped Li3xLa0.67-xTiO3 with Al3+ and V5+

Synthesis and Electrical Characterization of Doped Li3xLa0.6...

引用

2006年中国固态离子学暨国际电动汽车动力技术研讨会

作者： Li Ronghua Zi Liyun Wang Wenji Department of chemistry Fuzhou University Fuzhou Fujian 350002 china

＜正＞Perovskite-type Li3xLa0.67-xTiO3 doped with double metal cations is found to be showed good lithium ion conductivity. In this paper lithium fast ion conductors of Li3xLa0.67-xAlyTi1-2yVyO3 system were prepared by high temperature solid state reaction using Al3+ and V5+ partly substituted Ti4+ in the perovskite parent. X-Ray powder diffraction showed that perovskite solid solution with orthorhombic structure was formed and no second phase was found in the ranges of the initial composition x=0.10, y≤0.075. However a second phase Al2O3 was observed when x=0.10, y＞0.075. And the unit-cell volume decreases when Al3+ and V5+ substituted Ti4+ because the average ionic radius of Al3+ and V5+（55pm） is smaller than Ti4+ （68pm）. The electrical characterization of the heat treated sample was carried out in the frequency range of 100mHz to 8MHz, and the impedance plot and Equivalent circuit are analyed. The Z’ versus Z" impedance plot generally consisted of a semicircle and an incline spike. The semicircle we think is owing to parallel capacita.c. the cp（50nF） which is typical of a surface-layer or a grain-boundary effect and the inclined spike is due to a.c.nstant phase element （cPE） instead of double-layer capacita.c.（cdl） which was caused by the roughness of the particle surface. The incline spike also indicated that the samples are nearly pure ionic conductors. The a.c. impedance measurements showed that the Li3xLa0.67-xAlyTi1-2yVyO3 system lithium-ion conductivities are of the order of 10-4 ***-1 at room temperature .and the compositions have low activation energies of about 20-26kJ/mol in the temperature ranges of *** total lithium ion conductivity of the system decrease with the increasing y . The reason is that the distortion of the perovskite type of parent structure while Al3+（r=51pm） and V5+（r=59pm） substituting Ti4+（r=68pm） lead to Li+ mobility decreasing , then the conductivity decreases. The decomposition voltages of the compositions that doped with Al

关键词： perovskite conductivity fast lithium ion conductor a.c. impedance

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：