Synthesis and evaluation of artificial dielectrics consisting of metal nanoparticles

巯基丁二酸单层保护的金纳米粒子在水溶液表面自组装成单晶排列。通过改变组分纳米颗粒尺寸，纳米颗粒晶格的介电常数在5和11之间变化。随机堆积的金纳米颗粒薄膜的电导率在3.0 ~ 500 S/cm之间，其温度系数为1.2×10^<-4>K^<-1>，比体金的温度系数小一个数量级。这些材料潜在地可用于电子应用，例如抑制电子器件的热失控的镇流电阻，以及用于增加器件密度的栅极材料。

Mercaptosuccinic acid monolayer protected gold nanoparticles were self-assembled into single crystal arrangements at aqueous solution surfaces. The permittivity of the nanoparticle lattices was varied between 5 and 11 by altering the component nanoparticle size. Randomly packed gold nanoparticle films showed the conductivities between 3.0 and 500 S/cm, and their temperature coefficients were 1.2×10^<-4> K^<-1>, which was one order of magnitude smaller than that of bulk gold. These materials are potentially useful for electronic applications such as ballast resistances, which suppress thermal runaway of electronic devices, and gate materials for increasing device density.