Ag-SnO $_2$纳米颗粒膜中双逾渗转变的观察
Observation of double percolation transitions in Ag-SnO$_2$ nanogranular films
摘要：
在Ag体积分数为$\sim$ 0.2 ~ $\sim$ 0.9的Ag $_x$（SnO $_2)_{1-x}$）纳米颗粒膜中观察到两个逾渗转变。在每个逾渗阈值$x_{ci}$（$i$ $=$ 1，2）附近，$σ$随$x$的变化服从$x$ $>$ $x_{ci}$的幂律。在$x_{c1}$（$x_{c1}$ $>$ $x_{c2}$）处的第一个逾渗跃迁的起源与经典的一个类似，而第二个跃迁被解释为起源于隧穿到第二最近的相邻Ag颗粒。这些观测结果为目前有关导体-绝缘体纳米颗粒复合材料隧穿效应理论的有效性提供了强有力的实验支持。
英文摘要：
Two percolation transitions are observed in Ag$_x$(SnO$_2)_{1-x}$ nanogranular films with Ag volume fraction $x$ ranging from $\sim$0.2 to $\sim$0.9. In the vicinity of each percolation threshold $x_{ci}$ ($i$$=$1, 2), the variation in $σ$ with $x$ obeys a power law for $x$$>$$x_{ci}$. The origin of the first percolation transition at $x_{c1}$ ($x_{c1}$$>$$x_{c2}$) is similar to that of the classical one, while the second transition is explained as originating from the tunneling to the second-nearest neighboring Ag particles. These observations provide strong experimental support for the validity of current theories concerning tunneling effect in conductor-insulator nanogranular composites.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
