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AC electric field induced dielectrophoretic assembly behavior of gold nanoparticles in a wide frequency range

机译：交流电场诱导的金纳米粒子在宽频率范围内的介电泳组装行为

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摘要

In this work, we focus on frequency-dependence of pearl chain formations (PCF) of gold nanoparticles driven by AC dielectrophoresis (DEP), especially in a low field-frequency range, where induced double-layer charging effect at ideally polarizable surfaces on particle DEP behavior and surrounding liquid motion need not be negligible. As field frequency varies, grown features of DEP assembly structures ranging from low-frequency non-bridged gap to high-frequency single gold nanoparticle-made nanowires bridging the electrodes are demonstrated experimentally. Specifically, at 10 kHz, a kind of novel channel-like structure with parallel opposing banks is formed at the center of interelectrode gap. In stark contrast, at 1 MHz, thin PCF with diameter of 100 nm is created along the shortest distance of the isolation spacing. Moreover, a particular conductive path of nanoparticle chains is produced at 1 MHz in a DEP device embedded with multiple floating electrodes. A theoretical framework taking into account field-induced double-layer polarization at both the particle/electrolyte and electrode/electrolyte interface is developed to correlate these experimental observations with induced-charge electrokinetic (ICEK) phenomenon. And a RC circuit model is helpful in accounting for the formation of this particular non bridged channel-like structure induced by a low-frequency AC voltage. As compared to thin PCF formed at high field frequency that effectively short circuits the electrode pair, though it is difficult for complete PCF bridging to occur at low frequency, the non-bridged conducting microstructure has potential to further miniaturize the size of electrode gap fabricated by standard micromachining process and may find useful application in biochemical sensing. (C) 2016 Elsevier B.V. All rights reserved.
机译：在这项工作中，我们重点研究由交流介电电泳（DEP）驱动的金纳米颗粒的珍珠链形成（PCF）的频率依赖性，特别是在低场频范围内，在该范围内，在理想的极化表面上产生了双层充电效应DEP行为和周围的液体运动不必忽略不计。随着场频的变化，实验证明了DEP组装结构的增长特征，从低频非桥接间隙到高频单金纳米粒子制成的桥接电极的纳米线。具体地，在10kHz下，在电极间间隙的中心处形成一种具有平行的相对的堤岸的新颖的通道状结构。与之形成鲜明对比的是，在1 MHz处，沿着隔离间隔的最短距离创建了直径为100 nm的薄PCF。此外，在嵌入有多个浮动电极的DEP装置中，纳米粒子链的特定导电路径在1 MHz时产生。建立了一个理论框架，该框架考虑了在颗粒/电解质和电极/电解质界面处的场致双层极化，从而将这些实验观察结果与感应电荷电动势（ICEK）现象相关联。 RC电路模型有助于解决由低频AC电压引起的这种特殊的非桥接通道状结构的形成。与在高电场频率下形成的薄PCF有效地使电极对短路相比，尽管很难在低频下进行完整的PCF桥接，但非桥式导电微结构仍有潜力进一步缩小由电极制造的电极间隙的尺寸标准的微加工工艺，并可能在生化传感中找到有用的应用。 （C）2016 Elsevier B.V.保留所有权利。

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  • 来源
    《Applied Surface Science》 |2016年第may1期|184-192|共9页
  • 作者

    Liu Weiyu; Wang Chunhui; Ding Haitao; Shao Jinyou; Ding Yucheng;

  • 作者单位

    Xi An Jiao Tong Univ, State Key Lab Mfg Syst Engn, Micro & Nanomfg Res Ctr, 28 West Xianning Rd, Xian 710049, Shaanxi, Peoples R China;

    Xi An Jiao Tong Univ, State Key Lab Mfg Syst Engn, Micro & Nanomfg Res Ctr, 28 West Xianning Rd, Xian 710049, Shaanxi, Peoples R China;

    Xi An Jiao Tong Univ, State Key Lab Mfg Syst Engn, Micro & Nanomfg Res Ctr, 28 West Xianning Rd, Xian 710049, Shaanxi, Peoples R China;

    Xi An Jiao Tong Univ, State Key Lab Mfg Syst Engn, Micro & Nanomfg Res Ctr, 28 West Xianning Rd, Xian 710049, Shaanxi, Peoples R China;

    Xi An Jiao Tong Univ, State Key Lab Mfg Syst Engn, Micro & Nanomfg Res Ctr, 28 West Xianning Rd, Xian 710049, Shaanxi, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Dielectrophoretic assembly; Field-induced double-layer polarization; Gold nanoparticle; Induced-charge electrokinetic; Pearl chain formation;

    机译：介电泳组装;场致双层极化;金纳米粒子;感应电荷电动;珍珠链形成;

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