Reversible metal-insulator transition in ordered metal nanocrystal monolayers observed by impedance spectroscopy
Reversible metal-insulator transition in ordered metal nanocrystal monolayers observed by impedance spectroscopy
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DOI：
10.1103/physrevlett.80.3807
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发表时间：
1998-04-27
影响因子：
8.6
通讯作者：
Heath, JR
中科院分区：
文献类型：
--
作者：
Markovich, G;Collier, CP;Heath, JR
将低频阻抗谱应用于烷基硫醇钝化的35埃直径银量子点的朗缪尔单层，作为粒子间间距的函数。当颗粒间间距减小到颗粒直径的30%以下时，观察到颗粒间电荷隧穿时间的减少。进一步压缩时，薄膜的复阻抗经历了从并联RC等效电路到电感电路的转变。薄膜中的光学反射率变化与推断的金属-绝缘体转变是一致的。
Low frequency impedance spectroscopy was applied on a Langmuir monolayer of alkylthiol passivated 35 Angstrom diameter silver quantum dots, as a function of interparticle separation distance. As interparticle spacing decreases below 30% of particle diameter, a reduction in interparticle charge tunneling time is observed. On further compression, the complex impedance of the films undergoes a transition from a parallel RC equivalent circuit to an inductive circuit. Optical reflectance changes in the films are consistent with the deduced metal-insulator transition.