Precise Semiconductor Nanowire Placement Through Dielectrophoresis

Raychaudhuri, Sourobh; Dayeh, Shadi A.; Wang, Deli; Yu, E. T.

doi:10.1021/nl900423g

Cited by 185 publications

(170 citation statements)

References 27 publications

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“…This kind of phenomenon has been widely used to manipulate and assemble nanowires and carbon nanotubes onto electrodes. [44][45][46][47][48][49] …”

Section: A Experimental Resultsmentioning

confidence: 99%

“…42,43 Previous numerical and experimental studies demonstrate that the DEP effect should be taken into account to study the electrokinetic transport of spherical particles where nonuniform electric fields are present. 11,15 Recently, a DEP-induced alignment phenomenon of nanowires and carbon nanotubes [44][45][46][47][48][49] to external electric fields was experimentally observed, indicating a significant DEP effect on the motion of cylindrical particles subjected to external electric fields. Considering the DEP effect, Winter and Welland 50 predicted that nonspherical particles are always aligned with their longest axis parallel to the electric field using a transient model, which did not consider the distortions of the electric and flow fields by the presence of the particle.…”

Section: Introductionmentioning

confidence: 99%

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dc electrokinetic transport of cylindrical cells in straight microchannels

Beşkök

Gauthier

et al. 2009

Biomicrofluidics

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Electrokinetic transport of cylindrical cells under dc electric fields in a straight microfluidic channel is experimentally and numerically investigated with emphasis on the dielectrophoretic ͑DEP͒ effect on their orientation variations. A twodimensional multiphysics model, composed of the Navier-Stokes equations for the fluid flow and the Laplace equation for the electric potential defined in an arbitrary Lagrangian-Eulerian framework, is employed to capture the transient electrokinetic motion of cylindrical cells. The numerical predictions of the particle transport are in quantitative agreement with the obtained experimental results, suggesting that the DEP effect should be taken into account to study the electrokinetic transport of cylindrical particles even in a straight microchannel with uniform cross-sectional area. A comprehensive parametric study indicates that cylindrical particles would experience an oscillatory motion under low electric fields. However, they are aligned with their longest axis parallel to the imposed electric field under high electric fields due to the induced DEP effect.

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“…This kind of phenomenon has been widely used to manipulate and assemble nanowires and carbon nanotubes onto electrodes. [44][45][46][47][48][49] …”

Section: A Experimental Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

dc electrokinetic transport of cylindrical cells in straight microchannels

Beşkök

Gauthier

et al. 2009

Biomicrofluidics

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“…For cylindrical shape nanowires, the dielectrophoretic force (FDEP) force acting along the NW's long axis can be approximated to that of a prolate ellipsoid given by Eq. 3 21,22,[38][39][40][41] :…”

Section: Eq 2 ( ) = +mentioning

confidence: 99%

Simultaneous Tunable Selection and Self-Assembly of Si Nanowires from Heterogeneous Feedstock

Constantinou¹,

Rigas

Castro

et al. 2016

ACS Nano

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Semiconducting nanowires (NWs) are becoming essential nano-building blocks for advanced devices from sensors to energy harvesters, however their full technology penetration requires large scale materials synthesis together with efficient NW assembly methods. We demonstrate a scalable one-step solution process for the direct selection, collection and ordered assembly of silicon NWs with desired electrical properties from a poly-disperse collection of NWs obtained from a Supercritical Fluid-Liquid-Solid growth process. Dielectrophoresis (DEP) combined with impedance spectroscopy provides a selection mechanism at high signal frequencies (>500 kHz) to isolate NWs with the highest conductivity and lowest defect density. The technique allows simultaneous control of five key parameters in NW assembly: selection of electrical properties, control of NW length, placement in pre-defined electrode areas, highly preferential orientation along the device channel and control of NWs deposition density from few to hundreds per device. Direct correlation between DEP signal frequency and deposited NWs conductivity is directly confirmed by field-effect transistor and conducting-AFM data. Fabricated NW transistor devices demonstrate excellent performance with up to 1.6 mA current, 106-107 on/off ratio and hole-mobility of 50 cm2 V-1 s-1

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“…Different approaches are under investigation, such as dielectrophoresis (DEP) [19][20][21], magnetophoresis [22], Langmuir-Blodgett [23], bubble blowing [24], contact printing [25][26], and nanoscale combing [27]. DEP has been successfully proved to be a cost-effective method to trap and also to align nanoparticles [28], NWs [21,[29][30] and carbon-based nanostructures [31][32][33] between electrodes, as well as, to separate different particles [34] and cells [35][36] in microfluidic systems. Briefly, this technique relies on alternating current (AC) electric fields to align those nanostructures at specific sites through the polarizability of dielectric structures [37].…”

Section: Introductionmentioning

confidence: 99%