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Evaluating Plasmonic Transport in Current-carrying Silver Nanowires
Published on: December 11, 2013
金属运输在聚氨林中进行.
Kwanghee Lee1, Shinuk Cho, Sung Heum Park
1Department of Physics, Pusan National University, Busan 609-735, Korea. kwhlee@pusan.ac.kr
Nature
|May 5, 2006
概括
研究人员首次在导电聚合物中实现了经典的金属运输特性. 新的聚氨酸样本显示电阻性随温度的下降而下降,红外光谱与德鲁德模型相匹配.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 聚合物科学 聚合物科学
背景情况:
- 导电聚合物,尽管进行了数十年的研究,但没有表现出典型的金属运输特性.
- 障碍诱导的局部化以前阻碍了真正的金属行为,导致低温时电阻增加,以及导电谱中偏离德鲁德理论.
- 之前的研究未能在温度下降时实现电阻的单调下降,这是金属行为的标志.
研究的目的:
- 在导电聚合物中实现和报告经典的金属运输特性.
- 为了研究新型聚亚尼林样品的电阻和红外导电性.
- 为了确定这些聚合物是否表现出常规金属特征的德鲁德式行为.
主要方法:
- 使用自稳定分散聚合物合成聚氨样本的合成.
- 测量电阻力作为温度的函数,低至5K.
- 分析红外光谱以确定频率依赖导电性 (西格玛,欧米茄).
主要成果:
- 准备了具有室温导电率超过1000 S cm ((-1) 的聚亚尼林样品.
- 随着温度降至5K,观察到电阻的单调下降,与金属的行为一致.
- 红外光谱表现出传统德鲁德模型的特征,即使在低频率,与之前的聚合物研究不同.
结论:
- 该研究报告了在导电聚合物中首次观察到真正的金属运输特性.
- 自稳定分散聚合使得具有金属特性的聚氨的产生成为可能.
- 这些发现克服了与导电聚合物中乱诱导的局部化相关的先前限制.
相关概念视频
Bonding in Metals
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Metallic Solids
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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An electron moves through the crystal, containing positive ions,...
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The transport number is the fraction of the total current carried by an ion in an electrolyte solution. It is defined as the ratio of the current carried by a specific ion to the total current flowing through the solution. The transport number, t, is central to understanding ionic mobility, which describes how fast an ion moves under the influence of an electric field. This link connects the physical behavior of ions in solution to the chemical processes that occur during electrochemical...

