Dielectrophoresis of carbon nanotubes using microelectrodes: a numerical study

Dimaki, Maria; Bøggild, Peter

doi:10.1088/0957-4484/15/8/039

Cited by 216 publications

(185 citation statements)

References 25 publications

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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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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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“…The time-averaged DEP force acting on the particles in an alternating current (ac) field was given by [27] …”

Section: Dep Theorymentioning

confidence: 99%

Carbon nanotube‐sensor‐integrated microfluidic platform for real‐time chemical concentration detection

et al. 2009

Electrophoresis

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This paper presents the development of a chemical sensor employing electronic-grade carbon nanotubes (EG-CNTs) as the active sensing element for sodium hypochlorite detection. The sensor, integrated in a PDMS-glass microfluidic chamber, was fabricated by bulk aligning of EG-CNTs between gold microelectrode pairs using dielectrophoretic technique. Upon exposure to sodium hypochlorite solution, the characteristics of the carbon nanotube chemical sensor were investigated at room temperature under constant current mode. The sensor exhibited responsivity, which fits a linear logarithmic dependence on concentration in the range of 1/32 to 8 ppm, a detection limit lower than 5 ppb, while saturating at 16 ppm. The typical response time of the sensor at room temperature is on the order of minutes and the recovery time is a few hours. In particular, the sensor showed an obvious sensitivity to the volume of detected solution. It was found that the activation power of the sensor was extremely low, i.e. in the range of nanowatts. These results indicate great potential of EG-CNT for advanced nanosensors with superior sensitivity, ultra-low power consumption, and less fabrication complexity.

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“…Numerical studies have also been performed to provide theoretical support of the process (Dimaki & Bøggild, 2004;Padmaraj et al, 2009). However, most of these research efforts are focused on the alignment of CNT thin films.…”

Section: Introductionmentioning

confidence: 99%