Controlled Mounting of Individual Multiwalled Carbon Nanotubes on Support Tips

Jonge, Niels de; Lamy, Yann; Kaiser, M.

doi:10.1021/nl034792h

Cited by 68 publications

(50 citation statements)

References 26 publications

(45 reference statements)

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“…Additionally, CNTs mounted on support tips, e.g. tungsten tips, can be applied as field emitters in field emission displays or in high-resolution electron beam instruments like SEMs [47,48]. First experiments have been carried out successfully to demonstrate the functionality of the developed components of the nanomanipulator described above.…”

Section: Manipulation Of Carbon Nanotubesmentioning

confidence: 99%

“…teleoperated, micromanipulation under a light-microscope, in the SEM or in the TEM [17,48,49,51]. The manual assembly process is very time consuming and expensive, which places significant constraints on large-scale fabrication.…”

Section: Manipulation Of Carbon Nanotubesmentioning

confidence: 99%

“…The manual assembly process is very time consuming and expensive, which places significant constraints on large-scale fabrication. The time needed to attach a nanotube on a probe tip is reported in literature to be between 20 and 30 min [17,48]. Also, the reliability and repeatability are very poor.…”

Section: Manipulation Of Carbon Nanotubesmentioning

confidence: 99%

See 2 more Smart Citations

Nanomanipulation in a scanning electron microscope

Fahlbusch

Mazerolle

Breguet

et al. 2005

Journal of Materials Processing Technology

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Section: Manipulation Of Carbon Nanotubesmentioning

confidence: 99%

Section: Manipulation Of Carbon Nanotubesmentioning

confidence: 99%

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Nanomanipulation in a scanning electron microscope

Fahlbusch

Mazerolle

Breguet

et al. 2005

Journal of Materials Processing Technology

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“…The latter acquires properties such as a stable emitted current and high brightness [7]. Moreover, due to screening effects [8], there is a tendency to construct only one structure that protrudes effectively to the substrate tip [9].…”

mentioning

confidence: 99%

Mechanically stable nanostructures with desirable characteristic field enhancement factors: a response from scale invariance in electrostatics

Assis

Dall’Agnol

2016

Nanotechnology

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This work presents an accurate numerical study of the electrostatics of a system formed by individual nanostructures mounted on support substrate tips, which provides a theoretical prototype for applications in field electron emission or for the construction of tips in probe microscopy that requires high resolution. The aim is describe the conditions to produce structures mechanically robust with desirable field enhancement factor (FEF). We modeled a substrate tip with a height h1, radius r1 and characteristic FEF γ1, and a top nanostructure with a height h2, radius r2 < r1 and FEF γ2, for both hemispheres on post-like structures. The nanostructure mounted on the support substrate tip then has a characteristic FEF, γC . Defining the relative difference ηR = (γC − γ1)/(γ3 − γ1), where γ3 corresponds to the reference FEF for a hemisphere of the post structure with a radius r3 = r2 and height h3 = h1 + h2, our results show, from a numerical solution of Laplace's equation using a finite element scheme, a scaling ηR = f (u ≡ λθ −1 ), where λ ≡ h2/h1 and θ = r1/r2. Given a characteristic variable uc, for u uc, we found a power law ηR ∼ u κ , with κ ≈ 0.55. For u uc, ηR → 1, which led to conditions where γC → γ3. As a consequence of scale invariance, it is possible to derive a simple expression for γC and to predict the conditions needed to produce related systems with a desirable FEF that are robust owing to the presence of the substrate tip. Finally, we discuss the validity of Schottky's conjecture (SC) for these systems, showing that, while to obey SC is indicative of scale invariance, the opposite is not necessarily true. This result suggests that a careful analysis must be performed before attributing SC as an origin of giant FEF in experiments.Producing nanostructures that allow one to amplify the applied electric field in their vicinity and which are mechanically stable remains an engineering challenge. This can be observed already a long time ago in the pioneer work by Gomer who discuss a method for growing metal whiskers in a modified field emission tube [1]. In fact, the issue of mechanical stability requires a solution for the degradation and failure of nanostructures that occurs during field electron emission at or near the substrate emitter contact [2] and for the self-mechanical oscillations that occur during field electron emission measurements [3,4] or from electrostatic interactions [5]. In particular, a method to study the self-oscillations of a nanostructure mounted on a macroscopic frame requires using a laser beam to excite the sample; subsequently, a second laser beam is then used to register the amplitude of vibrations at a certain point from the object [6].Applications of these nanostructures mounted on tip devices include carbon nanotubes (CNTs) mounted on a support tip, which can be used as an electron source in a high-resolution electron beam. The latter acquires properties such as a stable emitted current and high brightness [7]. Moreover, due to screening effects [8], there is a tendency to...

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“…MWNTs with closed caps with a fullerene-like structure, and grown by an arc-discharge method (Rosseter) [18,20], were individually mounted on tungsten needles using a nanomanipulator (Omicron) inside a scanning electron microscope (Philips) [21,22]. The adhesion of a nanotube to a tungsten tip was strengthened with the aid of the glue from carbon tape.…”

mentioning

confidence: 99%