Logarithmic behavior of the conductivity of electron-beam deposited granular Pt/C nanowires
Logarithmic behavior of the conductivity of electron-beam deposited granular Pt/C nanowires
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DOI：
10.1103/physrevb.72.233407
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发表时间：
2005-12-01
影响因子：
3.7
通讯作者：
Rotkin, SV
中科院分区：
文献类型：
--
作者：
Rotkina, L;Oh, S;Rotkin, SV
我们发现颗粒状Pt/C复合纳米线的电导率在很宽的温度范围内具有对数温度依赖性。这种对数依赖性可以用导电碳基体中Pt颗粒之间的库仑相互作用来解释。我们强调复合纳米颗粒材料中的导电性机制与块体金属/半导体和低维系统中的已知机制的差异，包括二维弱局部化系统中的对数依赖性。我们的观察结果表明，晶粒之间的局部电压波动导致具有高电导率的样品（退火的纳米线）的log（T）依赖性，而具有低电导率的样品（如制造的纳米线）似乎是具有库仑间隙的绝缘体。
We found that granular Pt/C composite nanowires have a logarithmic temperature dependence of conductivity in a wide range of temperatures. The logarithmic dependence can be explained by Coulomb interaction between Pt grains in a conductive carbon matrix. We stress the difference of the conductivity mechanism in the composite nanogranular material and known mechanisms in bulk metals/semiconductors and low-dimensional systems, including logarithmic dependence in systems with two-dimensional weak localization. Our observations show that local voltage fluctuations between grains result in the log(T) dependence for the samples with high conductivity (annealed nanowires), while the samples with low conductivity (as fabricated nanowires) appear to be insulators with a Coulomb gap.