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Essential role of enhanced surface electron-phonon interactions on the electrical transport of suspended polycrystalline gold nanofilms

机译：增强表面电子 - 声子相互作用的基本作用对悬浮的多晶金纳米丝电阻的电气传输

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摘要

The electrical resistivity of suspended polycrystalline gold nanofilms with different lengths has been measured over the temperature range of 2 K to 340 K, which dramatically increases compared with bulk gold and slightly increases with length. Classical size effect theories considering surface and grain boundary scatterings cannot explain the increased film resistivity, especially the temperature dependence of resistivity, over the whole temperature range. Considering the fact that the reduction of the coordination number of atoms at the surface and the interface leads to a decrease of the phonon spectrum frequency and consequently affects the surface phonon spectrum, the electron-phonon interaction as a relatively independent surface effect is taken into account. The theoretical predictions and the experimental measured film resistivity match very well over the whole temperature range and the extracted surface Debye temperature decreases significantly compared to the bulk value, which illustrates the essential role of enhanced surface electron-phonon interactions on the electrical transport of the present gold nanofilms.
机译：悬浮的多晶金纳米膜具有不同长度的电阻率已经在温度范围为2 K，340 K，这显着地增加了与块体金相比，并用长度稍微增加测量。考虑表面和晶界散射经典尺寸效应理论不能解释增加的薄膜电阻率，特别是电阻率的温度依赖性，在整个温度范围内。在考虑到在表面原子和接口导线的配位数，以声子谱频率的减小还原并因此影响表面声子谱，作为相对独立的表面效果的电子 - 声子的相互作用是考虑到。理论预测与实验测得的薄膜电阻率匹配得很好，在整个温度范围内和所提取的面的德拜温度降低显著相比散装值，其示出增强的表面电子 - 声子相互作用对本的电输送的关键作用黄金纳米薄膜。

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  • 来源
    《RSC Advances》 |2018年第37期|共7页
  • 作者

    Miao Tingting; Li Dawei; Shi Shaoyi; Ji Zhongli; Ma Weigang; Zhang Xing; Zhong Qing; Wang Xueshen;

  • 作者单位

    China Univ Petr Coll Mech &

    Transportat Engn Beijing Key Lab Proc Fluid Filtrat &

    Separat Beijing 102249 Peoples R China;

    China Univ Petr Coll Mech &

    Transportat Engn Beijing Key Lab Proc Fluid Filtrat &

    Separat Beijing 102249 Peoples R China;

    Tsinghua Univ Dept Engn Mech Minist Educ Key Lab Thermal Sci &

    Power Engn Beijing 100084 Peoples R China;

    China Univ Petr Coll Mech &

    Transportat Engn Beijing Key Lab Proc Fluid Filtrat &

    Separat Beijing 102249 Peoples R China;

    Tsinghua Univ Dept Engn Mech Minist Educ Key Lab Thermal Sci &

    Power Engn Beijing 100084 Peoples R China;

    Tsinghua Univ Dept Engn Mech Minist Educ Key Lab Thermal Sci &

    Power Engn Beijing 100084 Peoples R China;

    Natl Inst Metrol Beijing 100029 Peoples R China;

    Natl Inst Metrol Beijing 100029 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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