Replica molding-based nanopatterning of tribocharge on elastomer with application to electrohydrodynamic nanolithography.
Replica molding-based nanopatterning of tribocharge on elastomer with application to electrohydrodynamic nanolithography.
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DOI：
10.1038/s41467-018-03319-4
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发表时间：
2018-03-02
影响因子：
16.6
通讯作者：
Kim J
中科院分区：
文献类型：
--
作者：
Li Q;Peer A;Cho IH;Biswas R;Kim J
模压成型常常会引起弹性体的摩擦带电。到目前为止，这种现象只在未织构的弹性体表面上被研究过，尽管复制模塑是一种有效的纳米织构方法。在这里，我们表明，在通过复制模塑纳米织构的弹性体表面上，诱导的摩擦电荷也在纳米尺度上形成图案化，与纳米织构密切相关。通过应用开尔文探针显微镜、电流体动力学光刻和静电分析我们的模型纳米结构，由聚碳酸酯纳米锥阵列复制的聚(二甲基硅氧烷)纳米微球阵列，我们揭示了诱导摩擦电荷高度集中在纳米微球内，特别是在其边缘。通过有限元分析还发现，卸荷过程中轮缘承受的摩擦力最大。根据这些发现，我们确定剥离诱导的摩擦是控制摩擦电荷纳米级分布模式的主要因素。通过将产生的环形摩擦电荷结合到电流体光刻中，我们还轻松地实现了具有10 纳米级陨石坑的纳米火山。摩擦荷电，即表面摩擦后电荷的积累，可以在材料行为中发挥不寻常的作用，但目前尚不清楚纳米结构如何影响电荷积累和分布。在这里，作者使用复制品模塑来定位和设计纳米杯轮缘周围的电荷。
Replica molding often induces tribocharge on elastomers. To date, this phenomenon has been studied only on untextured elastomer surfaces even though replica molding is an effective method for their nanotexturing. Here we show that on elastomer surfaces nanotextured through replica molding the induced tribocharge also becomes patterned at nanoscale in close correlation with the nanotexture. By applying Kelvin probe microscopy, electrohydrodynamic lithography, and electrostatic analysis to our model nanostructure, poly(dimethylsiloxane) nanocup arrays replicated from a polycarbonate nanocone array, we reveal that the induced tribocharge is highly localized within the nanocup, especially around its rim. Through finite element analysis, we also find that the rim sustains the strongest friction during the demolding process. From these findings, we identify the demolding-induced friction as the main factor governing the tribocharge’s nanoscale distribution pattern. By incorporating the resulting annular tribocharge into electrohydrodynamic lithography, we also accomplish facile realization of nanovolcanos with 10 nm-scale craters. Tribocharging, or the buildup of charge on surfaces after they are rubbed together, can play unusual roles in material behavior, yet it is unclear how nanostructuring impacts charge buildup and distribution. Here, authors use replica molding to localize and pattern charges around nanocup rims.
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影响因子：
4.6
作者：
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