A 3-D NanoMagnetoElectrokinetic model for ultra-high precision assembly of ferromagnetic NWs using magnetic-field assisted dielectrophoresis

Singh, Sachin Kumar; Rajib, Mahadi; Drobitch, Justine L.; Atulasimha, Jayasimha; Bandyopadhyay, Supriyo; Subramanian, Arunkumar

doi:10.1039/d0ra08381j

Cited by 3 publications

(2 citation statements)

References 32 publications

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“…Magnetophoretic assembly can also be combined with electric fields to improve the precision of assembly. Singh et al 375 assembled aligned single nickel nanowires between patterned electrodes with a high positioning accuracy of 25 nm by combining magnetic and electric fields. The electric field exerted a DEP force on the nickel nanowire and attracted the nanowire close to the electrodes where the magnetic field took effect, capturing the nanowire and placing the nanowire precisely on top of the electrodes.…”

Section: Magnetic Field-directed Assemblymentioning

confidence: 99%

Directed Assembly of Nanomaterials for Making Nanoscale Devices and Structures: Mechanisms and Applications

2022

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Nanofabrication has been utilized to manufacture one-, two-, and threedimensional functional nanostructures for applications such as electronics, sensors, and photonic devices. Although conventional silicon-based nanofabrication (top-down approach) has developed into a technique with extremely high precision and integration density, nanofabrication based on directed assembly (bottom-up approach) is attracting more interest recently owing to its low cost and the advantages of additive manufacturing. Directed assembly is a process that utilizes external fields to directly interact with nanoelements (nanoparticles, 2D nanomaterials, nanotubes, nanowires, etc.) and drive the nanoelements to site-selectively assemble in patterned areas on substrates to form functional structures. Directed assembly processes can be divided into four different categories depending on the external fields: electric field-directed assembly, fluidic flowdirected assembly, magnetic field-directed assembly, and optical field-directed assembly. In this review, we summarize recent progress utilizing these four processes and address how these directed assembly processes harness the external fields, the underlying mechanism of how the external fields interact with the nanoelements, and the advantages and drawbacks of utilizing each method. Finally, we discuss applications made using directed assembly and provide a perspective on the future developments and challenges.

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Section: Magnetic Field-directed Assemblymentioning

confidence: 99%

Directed Assembly of Nanomaterials for Making Nanoscale Devices and Structures: Mechanisms and Applications

2022

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“…The bottom-up technology can be implemented using two different approaches: self-assembly [6] and precise positioning of nanoobjects for device assembly. Tranferring nanoobjects is possible with the help of different types of influences for instance, using dielectrophoretic [7][8][9], optical [10], acoustoelectronic [11], plasmonic [12] or other principles. The nanosphere-like objects could be simply manipulated using such so-called 'electromagnetic tweezers' [13] but the manipulation of the wool-like whiskers studied in this paper is very challenging.…”

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confidence: 99%

Shape memory effect nanotools for nano-creation: examples of nanowire-based devices with charge density waves

et al. 2021

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Nanotweezers based on the shape memory effect have been developed and tested. In combination with a commercial nanomanipulator, they allow 3D nanoscale operation controlled in a scanning electron microscope. Here we apply the tweezers for the fabrication of nanostructures based on whiskers of NbS3, a quasi one-dimensional compound with room-temperature charge density wave (CDW). The nanowhiskers were separated without damage from the growth batch, an entangled array, and safely transferred to a substrate with a preliminary deposited Au film. The contacts were fabricated with Pt sputtering on top of the whisker and the film. The high degree of synchronization of the sliding CDW under a RF field with a frequency up to 600 MHz confirms the high quality of the contacts and of the sample structure after the manipulations. The proposed technique paves the way to novel type micro- and nanostructures fabrication and their various applications.

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Dielectrophoresis: Measurement technologies and auxiliary sensing applications

Hu,

Ji,

Chen

et al. 2024

Electrophoresis

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Dielectrophoresis (DEP), which arises from the interaction between dielectric particles and an aqueous solution in a nonuniform electric field, contributes to the manipulation of nano and microparticles in many fields, including colloid physics, analytical chemistry, molecular biology, clinical medicine, and pharmaceutics. The measurement of the DEP force could provide a more complete solution for verifying current classical DEP theories. This review reports various imaging, fluidic, optical, and mechanical approaches for measuring the DEP forces at different amplitudes and frequencies. The integration of DEP technology into sensors enables fast response, high sensitivity, precise discrimination, and label‐free detection of proteins, bacteria, colloidal particles, and cells. Therefore, this review provides an in‐depth overview of DEP‐based fabrication and measurements. Depending on the measurement requirements, DEP manipulation can be classified into assistance and integration approaches to improve sensor performance. To this end, an overview is dedicated to developing the concept of trapping‐on‐sensing, improving its structure and performance, and realizing fully DEP‐assisted lab‐on‐a‐chip systems.

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A 3-D NanoMagnetoElectrokinetic model for ultra-high precision assembly of ferromagnetic NWs using magnetic-field assisted dielectrophoresis

Abstract: Magnetic-field assisted dielectrophoresis delivers ultra-high precision assembly of single nanowires.

Cited by 3 publications

References 32 publications

Directed Assembly of Nanomaterials for Making Nanoscale Devices and Structures: Mechanisms and Applications

Directed Assembly of Nanomaterials for Making Nanoscale Devices and Structures: Mechanisms and Applications

Shape memory effect nanotools for nano-creation: examples of nanowire-based devices with charge density waves

Dielectrophoresis: Measurement technologies and auxiliary sensing applications

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