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首页> 外文期刊>RSC Advances >Essential role of enhanced surface electron–phonon interactions on the electrical transport of suspended polycrystalline gold nanofilms
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Essential role of enhanced surface electron–phonon interactions on the electrical transport of suspended polycrystalline gold nanofilms

机译：表面电子-声子相互作用增强对悬浮多晶金纳米膜电传输的重要作用

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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：已在2 K至340 K的温度范围内测量了不同长度的悬浮多晶金纳米薄膜的电阻率，该电阻率与散装金相比显着增加，而随长度略有增加。考虑表面和晶界散射的经典尺寸效应理论不能解释整个温度范围内膜电阻率的增加，尤其是电阻率的温度依赖性。考虑到表面和界面处原子配位数的减少会导致声子光谱频率的降低，进而影响表面声子光谱，因此考虑将电子-声子相互作用作为一个相对独立的表面效应。理论预测值和实验测得的膜电阻率在整个温度范围内都非常匹配，并且提取的表面德拜温度与体积值相比显着降低，这说明增强的表面电子-声子相互作用对本发明的电输运至关重要。金纳米膜。

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