The role of the AC signal on the dielectrophoretic assembly of carbon nanotubes across indium tin oxide electrodes

Abdulhameed, Abdullah; Mohtar, Mohd Nazim; Hamidon, Mohd Nizar; Mansor, Ishak; Halin, Izhal Abdul

doi:10.1016/j.mee.2021.111597

Cited by 16 publications

(10 citation statements)

References 34 publications

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“…Further details regarding how to control the density of the aligned MWCNTs can be found elsewhere. 43 Fig. 3b shows that the density of the deposited MWCNTs is directly proportional to the concentration of the MWCNTs in the medium.…”

Section: Resultsmentioning

confidence: 91%

Airflow-assisted dielectrophoresis to reduce the resistance mismatch in carbon nanotube-based temperature sensors

et al. 2021

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Section: Resultsmentioning

confidence: 91%

Airflow-assisted dielectrophoresis to reduce the resistance mismatch in carbon nanotube-based temperature sensors

et al. 2021

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“…An acid mixture was used to etch the ITO layer before cleaning the photoresist remains using acetone and IPA. The lithography protocol used in this work was further explained elsewhere …”

Section: Methodsmentioning

confidence: 99%

“…The lithography protocol used in this work was further explained elsewhere. 40 3.3. Deposition Setup.…”

Section: Theory and Modelingmentioning

confidence: 99%

Optimization of Surfactant Concentration in Carbon Nanotube Solutions for Dielectrophoretic Ceiling Assembly and Alignment: Implications for Transparent Electronics

et al. 2022

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Surfactants such as sodium dodecyl sulfate (SDS) are used to improve the dispersity of carbon nanotubes (CNTs) in aqueous solutions. The surfactant concentration in CNT solutions is a critical factor in the dielectrophoretic (DEP) manipulation of CNTs. A high surfactant concentration causes a rapid increase in the solution conductivity, while a low concentration results in undesirably large CNT bundles within the solution. The increase in the solution conductivity causes drag velocity that obstructs the CNT manipulation process due to the electrothermal forces induced by the electric field. The presence of large CNT bundles is undesirable since they degrade the device performance. In this work, mathematical modeling and experimental work were used to optimize the concentration of the SDS surfactant in multiwalled carbon nanotube (MWCNT) solutions. The solutions were characterized using dynamic light scattering (DLS) and ultraviolet− visible spectroscopy (UV−Vis) analysis. We found that the optimum SDS concentration in MWCNT solutions for the successful DEP manipulation of MWCNTs was between 0.1 and 0.01 wt %. A novel DEP configuration was then used to assemble MWCNTs across transparent electrodes. The configuration was based on ceiling deposition, where the electrodes were on top of a droplet. The newly proposed configuration reduced the drag velocity and prevented the assembly of large MWCNT bundles. MWCNTs were successfully assembled and aligned across interdigitated electrodes (IDEs). The assembly of MWCNTs from aqueous solutions across transparent electrodes has potential use in future transparent electronics and sensor devices.

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“…The CNTs would experience both translational and rotational motion if the electrode configuration changed from parallel plates to planner electrodes due to the DEP force, as shown in Figure 8c. In the DEP method, electric fields are usually generated by sinusoidal voltage sources [68]. Alternating pulsed currents are also used to assist the alignment [69].…”

Section: Alignment By Electric Forcesmentioning

confidence: 99%

Carbon Nanotube Alignment Methods

Abdulhameed¹

2023

Carbon Nanotubes - Recent Advances, New Perspectives and Potential Applications

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The outstanding properties of carbon nanotubes (CNTs) exist in their nanoscale form. The CNTs must be maintained aligned in the device to preserve these properties in the macroscale and bulk form. Recently, many studies addressed the alignment of CNTs at different scales for different applications. For example, CNTs are aligned vertically simultaneously as they grow on a substrate. Pre-synthesized CNTs can be aligned horizontally on a large scale under the influence of external forces such as electric and magnetic forces. This chapter reviews the latest techniques and methods regarding the horizontal alignment of CNTs. The alignment methods are classified based on the force used to achieve the alignment. The chapter concludes by discussing each method\'s advantages, disadvantages, and potential applications.

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The role of the AC signal on the dielectrophoretic assembly of carbon nanotubes across indium tin oxide electrodes

Cited by 16 publications

References 34 publications

Airflow-assisted dielectrophoresis to reduce the resistance mismatch in carbon nanotube-based temperature sensors

Airflow-assisted dielectrophoresis to reduce the resistance mismatch in carbon nanotube-based temperature sensors

Optimization of Surfactant Concentration in Carbon Nanotube Solutions for Dielectrophoretic Ceiling Assembly and Alignment: Implications for Transparent Electronics

Carbon Nanotube Alignment Methods

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