Carbon nanotubes as electrodes for dielectrophoresis of DNA.
Carbon nanotubes as electrodes for dielectrophoresis of DNA.
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碳纳米管作为 DNA 介电泳电极。
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
P. Törmä
中科院分区：
文献类型：
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作者：
S. Tuukkanen;J. J. Toppari;A. Kuzyk;Lasse Hirviniemi;V. Hytönen;T. Ihalainen;P. Törmä
介电电泳有可能用作分子器件制造中的有效捕获工具。然而，对于纳米级的物体，布朗运动带来了挑战。我们表明，碳纳米管电极的使用使得可以施加相对低的捕获电压，并且仍然实现足够高的场梯度来捕获纳米级物体，例如，单分子在捕获纳米级DNA分子的情况下，我们比较了碳纳米管电极和光刻制造的金属电极之间的介电电泳的效率和其他特性。使用有限元方法模拟的结果进行了分析，并揭示了DNA的频率依赖性极化率的信息。
Dielectrophoresis can potentially be used as an efficient trapping tool in the fabrication of molecular devices. For nanoscale objects, however, the Brownian motion poses a challenge. We show that the use of carbon nanotube electrodes makes it possible to apply relatively low trapping voltages and still achieve high enough field gradients for trapping nanoscale objects, e.g., single molecules. We compare the efficiency and other characteristics of dielectrophoresis between carbon nanotube electrodes and lithographically fabricated metallic electrodes, in the case of trapping nanoscale DNA molecules. The results are analyzed using finite element method simulations and reveal information about the frequency-dependent polarizability of DNA.