The effect of nanowire length and diameter on the properties of transparent, conducting nanowire films
The effect of nanowire length and diameter on the properties of transparent, conducting nanowire films
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DOI：
10.1039/c2nr30126a
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发表时间：
2012-01-01
期刊：
影响因子：
6.7
通讯作者：
Wiley, Benjamin J.
中科院分区：
文献类型：
--
作者：
Bergin, Stephen M.;Chen, Yu-Hui;Wiley, Benjamin J.
本文描述了纳米线的尺寸如何影响随机纳米线网络的透射率和薄层电阻。通过控制反应温度和时间，采用克级多元醇合成法合成了长度和直径独立可控的银纳米线。表征由不同长度但相同直径的纳米线组成的膜使得能够量化长度对银纳米线膜的电导和透射率的影响。使用时域差分计算来确定纳米线直径、重叠和孔尺寸对纳米线网络的透射率的影响。对于直径大于50 nm的单个纳米线，增加直径会增加电导与消光比，但对于直径小于此尺寸的纳米线则相反。计算和实验数据表明，对于纳米线的随机网络，减小纳米线直径在给定透射率下增加纳米线的数量密度，导致在高透射率（>90%）下改善的连接性和导电性。这些信息将有助于设计用于柔性显示器、有机发光二极管和薄膜太阳能电池的透明导电纳米线薄膜。
This article describes how the dimensions of nanowires affect the transmittance and sheet resistance of a random nanowire network. Silver nanowires with independently controlled lengths and diameters were synthesized with a gram-scale polyol synthesis by controlling the reaction temperature and time. Characterization of films composed of nanowires of different lengths but the same diameter enabled the quantification of the effect of length on the conductance and transmittance of silver nanowire films. Finite-difference time-domain calculations were used to determine the effect of nanowire diameter, overlap, and hole size on the transmittance of a nanowire network. For individual nanowires with diameters greater than 50 nm, increasing diameter increases the electrical conductance to optical extinction ratio, but the opposite is true for nanowires with diameters less than this size. Calculations and experimental data show that for a random network of nanowires, decreasing nanowire diameter increases the number density of nanowires at a given transmittance, leading to improved connectivity and conductivity at high transmittance (>90%). This information will facilitate the design of transparent, conducting nanowire films for flexible displays, organic light emitting diodes and thin-film solar cells.