Triaxial AFM Probes for Noncontact Trapping and Manipulation

Brown, Keith A.; Westervelt, Robert

doi:10.1021/nl201434t

Cited by 26 publications

(31 citation statements)

References 31 publications

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“…139 Analogously, dielectrophoresis refers to the force generated on a neutral particle when it is in an AC electric field: the electric field polarizes the particle, which in the non-uniform field results in a non-zero Coulomb force acting on the particle. Although two electrodes are usually required for dielectrophoresis 140 , the use of a triaxial probe to generate a dielectrophoresis field that acts as a non-contact trap for dielectric nanoparticles has been recently demonstrated 141,142 ( see FIG. 14).…”

Section: Electrokinetic Nanomanipulationmentioning

confidence: 99%

“…This method is proposed to work for particles as small as 5 nm 141 and has been verified for the isolation of 100 nm polystyrene beads. 142 The non-contact manipulation of nanoparticles in 3D can thus be achieved, with the probe moving the particle through the solution and releasing it on command. However, the strength of the trap limits the positioning accuracy of the particles in the solution, with the polystyrene beads having standard deviations of 133 nm and 204 nm in the x and y axes from the intended location.…”

Section: Electrokinetic Nanomanipulationmentioning

confidence: 99%

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Additive nanomanufacturing – A review

et al. 2014

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Section: Electrokinetic Nanomanipulationmentioning

confidence: 99%

Section: Electrokinetic Nanomanipulationmentioning

confidence: 99%

Additive nanomanufacturing – A review

et al. 2014

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“…Burgeoning methods of additive nanomanufacturing offer a potential solution to this problem, by enabling the top-down integration of existing devices with nanomaterials [1][2][3][4][5][6] , whose properties have demonstrable applications in novel areas of biosensing 4 , single-electron transport 5 , quantum phenomena 6 , and more. These materials can be made to self-assemble into desired configurations via many driving forces, from electrophoresis [7][8][9][10] , DNA-linkages 11,12 and geometrical interactions [13][14][15] . Controlling when and where such self-assembly occurs requires lithography, however, which to integrate with modern device designs must meet sub-100 nm resolution as standard.…”

Section: Introductionmentioning

confidence: 99%

Nanoparticle assembly enabled by EHD-printed monolayers

2017

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Augmenting existing devices and structures at the nanoscale with unique functionalities is an exciting prospect. So is the ability to eventually enable at the nanoscale, a version of rapid prototyping via additive nanomanufacturing. Achieving this requires a step-up in manufacturing for industrial use of these devices through fast, inexpensive prototyping with nanoscale precision. In this paper, we combine two very promising techniques-self-assembly and printing-to achieve additively nanomanufactured structures. We start by showing that monolayers can drive the assembly of nanoparticles into pre-defined patterns with single-particle resolution; then crucially we demonstrate for the first time that molecular monolayers can be printed using electrohydrodynamic (EHD)-jet printing. The functionality and resolution of such printed monolayers then drives the self-assembly of nanoparticles, demonstrating the integration of EHD with self-assembly. This shows that such process combinations can lead towards more integrated process flows in nanomanufacturing. Furthermore, in-process metrology is a key requirement for any large-scale nanomanufacturing, and we show that Dual-Harmonic Kelvin Probe Microscopy provides a robust metrology technique to characterising these patterned structures through the convolution of geometrical and environmental constraints. These represent a first step toward combining different additive nanomanufacturing techniques and metrology techniques that could in future provide additively nanomanufactured devices and structures.

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“…Another research study of particular interest was performed by Brown et al [63]. In this study, Brown et al created a tri-axial probe to be used for DEP studies.…”

Section: Dielectrophoresismentioning

confidence: 99%

“…FIGURE 2 -Tri-Axial AFM Probe [63] These experiments were done to illustrate particle trapping by nDEP [63]. The purpose of the study was to determine if "pick and place" nano-assembly was possible using DEP.…”

Section: Dielectrophoresismentioning

confidence: 99%

Trapping of nanoparticles with dielectrophoretic nano-probes.

Wood¹

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negative dielectrophoresis repels particles from the region of the highest electric field gradient. The dielectrophoretic force is directly proportional to the square of the electric field gradient, as well as the cube of the radius of the particles involved.As particles decrease in size, the gradient of the electric field must increase rapidly in order to capture or repel the particles. The intense electric field gradients were produced using fabricated silver gallium (Ag 2 Ga) nano-probes electrodes in conjunction with indium tin oxide (ITO) coated microscope cover slips, which served as the opposite electrode. The silver gallium nano-probes ranged from approximately 100-500 nm in diameter and were typically positioned less than 40 µm above the ITO cover slips.Positive and negative dielectrophoretic forces were able to dominate the other electrokinetic forces acting on sub-micron particles, which were suspended in deionized water and aqueous potassium chloride, using the nano-probes and ITO cover slips as electrodes. Colloidal quantum dots of gold, as small as 5 nm in diameter, were captured using positive DEP forces, as were sub-micron fluorescent polystyrene particles.Negative DEP forces repelled sub-micron fluorescent polystyrene particles suspended in a low conductivity solution.

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Triaxial AFM Probes for Noncontact Trapping and Manipulation

Cited by 26 publications

References 31 publications

Additive nanomanufacturing – A review

Additive nanomanufacturing – A review

Nanoparticle assembly enabled by EHD-printed monolayers

Trapping of nanoparticles with dielectrophoretic nano-probes.

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