Electrophoretic Deposition of Iron Oxide Nanoparticles on Templates
Electrophoretic Deposition of Iron Oxide Nanoparticles on Templates
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DOI：
10.1021/jp405395y
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发表时间：
2013-08
影响因子：
3.7
通讯作者：
S. Oberdick;S. Majetich
中科院分区：
文献类型：
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作者：
S. Oberdick;S. Majetich
我们利用模板和电场的组合研究了纳米颗粒的引导自组装。合成了11.2±0.5 nm的氧化铁纳米粒子，并将其分散在甲苯中。电泳迁移率测量表明，大多数纳米颗粒都有少量的过剩电荷。使用平行板几何结构，施加电压以驱动颗粒朝向淹没在纳米颗粒分散体中的电极。这些电极要么是裸硅片，要么是掺有倍半硅氧烷(HSQ)电子束抗蚀剂的纳米硅。我们演示了电场如何引导纳米粒子选择性地围绕图案化特征成核。建立了一个模型来预测电场对图案化模板的影响以及引导纳米粒子自组装的力。
We have investigated guided self-assembly of nanoparticles using a combination of templates and electric fields. Some 11.2 ± 0.5 nm iron oxide nanoparticles were synthesized and dispersed in toluene. Electrophoretic mobility measurements indicate that most nanoparticles have a small excess charge. Using a parallel plate geometry, a voltage is applied to drive particles toward electrodes submersed in the nanoparticle dispersion. These electrodes are either bare silicon wafers or Si nanopatterned with hydrogen silsesquioxane (HSQ) electron beam resist. We demonstrate how an electric field can guide the nanoparticles to selectively nucleate around patterned features. A model is developed to predict the effect of the electric field on a patterned template and the forces guiding the nanoparticle self-assembly.