Heating-Enhanced Dielectrophoresis for Aligned Single-Walled Carbon Nanotube Film of Ultrahigh Density

Gu, Qiang; Guezo, Maud; Folliot, Hervé; Batté, Thomas; Loualiche, Slimane; Stervinou, Julie

doi:10.1186/s11671-017-2199-1

Cited by 4 publications

(4 citation statements)

References 12 publications

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“…Increasing SWNT concentration further led to a linear density increase, which inevitably causes the formation of a second and possibly third layer. An alternate approach for enhancing SWNT density was proposed by Gu et al, 262 who reported the fabrication of horizontal SWNT films using a heating enhanced DEP process, where the "convection force" induced by the heating effect promotes the exchange and transfer of individual SWNTs to the vicinity of the DEP grooves. The prepared horizontal SWNTs with ultrahigh density will have important implications in the fabrication of high-quality nanodevices if the degree of alignment can be further improved.…”

Section: Dielectrophoresismentioning

confidence: 99%

Horizontal Single-Walled Carbon Nanotube Arrays: Controlled Synthesis, Characterizations, and Applications

Zhang

2020

Chem. Rev.

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Single-walled carbon nanotubes (SWNTs) emerge as a promising material to advance carbon nanoelectronics. However, synthesizing or assembling pure metallic/semiconducting SWNTs required for interconnects/integrated circuits, respectively, by a conventional chemical vapor deposition method or by an assembly technique remains challenging. Recent studies have shown significant scientific breakthroughs in controlled SWNT synthesis/assembly and applications in scaled field effect transistors, which are a critical component in functional nanodevices, thereby rendering the horizontal SWNT array an important candidate for innovating nanotechnology. This review provides a comprehensive analysis of the controlled synthesis, surface assembly, characterization techniques, and potential applications of horizontally aligned SWNT arrays. This review begins with the discussion of synthesis of horizontally aligned SWNTs with regulated direction, density, structure, and theoretical models applied to understand the growth results. Several traditional procedures applied for assembling SWNTs on target surface are also briefly discussed. It then discusses the techniques adopted to characterize SWNTs, ranging from electron/probe microscopy to various optical spectroscopy methods. Prototype applications based on the horizontally aligned SWNTs, such as interconnects, field effect transistors, integrated circuits, and even computers, are subsequently described. Finally, this review concludes with challenges and a brief outlook of the future development in this research field.

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Section: Dielectrophoresismentioning

confidence: 99%

Horizontal Single-Walled Carbon Nanotube Arrays: Controlled Synthesis, Characterizations, and Applications

Zhang

2020

Chem. Rev.

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“…The method is called light-assisted DEP (L-DEP) and was applied to sc-SWCNT since their relative permittivity is lower than mt-SWCNT [205]. Optically-induced dielectrophoresis (O-DEP) [297], heating-enhanced DEP (HE-DEP) [298], and chemically-enhanced DEP are other non-conventional DEP use other forces to assist the alignment process. In O-DEP, an optical source was used to illuminate sites on a photoconductive layer to generate a nonuniform electric field at the assembly location.…”

Section: Discussionmentioning

confidence: 99%

Dielectrophoretic alignment of carbon nanotubes: theory, applications, and future

2023

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Carbon nanotubes (CNTs) are nominated to be the successor of several semiconductors and metals due to their unique physical and chemical properties. It has been concerning that the anisotropic and low controllability of CNTs impedes their adoption in commercial applications. Dielectrophoresis (DEP) is known as the electrokinetics motion of polarizable nanoparticles under the influence of non-uniform electric fields. The uniqueness of this phenomenon allows DEP to be employed as a novel method to align, assemble, separate, and manipulate CNTs suspended in liquid mediums. This article begins with a brief overview of CNT structure and production, with the emphasize on their electrical properties and response to electric fields. The DEP phenomenon as a CNT alignment method is demonstrated and graphically discussed, along with its theory, procedure, and parameters. We also discussed the side forces that arise in DEP systems and how they negatively or positively affect the CNT alignment. The article concludes with a brief review of CNT-based devices fabricated using DEP, as well as the method’s limitations and future prospects. 

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“…The density of the array obviously increases with the duration time, just as summarized in figure 5(e). When chosen the duration time of 30 min, the density of aligned sc-SWCNTs array reaches up to 54±2 tubes μm −1 which is the highest linear density by dielectrophoresis method among relevant reports as shown in table 1 [24,26,41,42]. Transfer curves of sc-SWCNT FETs with different array densities are shown in figure 6(a).…”

Section: Optimization Of Linear Density With Duration Timementioning

confidence: 95%

“…Although off currents increase with the increase of array density, the on/off current ratios have no obvious correlation with the density, keeping at around 10 4 as seen in figure 6(b). Table 1 shows the related reports on the electrical properties of SWCNT transistors in dielectrophoresis method [24,26,41,42]. The transistor fabricated in this work exhibits obvious advantages in on/off current ratio under short channel due to high purity of sc-SWCNT and appropriate ratio between tube length and channel length.…”

Section: Optimization Of Linear Density With Duration Timementioning

confidence: 99%

Single layer aligned semiconducting single-walled carbon nanotube array with high linear density

Líu¹,

Liu²,

Sun³

et al. 2022

Nanotechnology

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Highly ordered semiconducting single-walled carbon nanotubes(sc-SWCNTs) array with high purity, high linear density and controllable manner is strongly desired for carbon-based integrated circuits, yet it remains a big challenge. Herein, close-packed single layered and controllably aligned sc-SWCNTs arrays were obtained through dielectrophoresis using a high purity sc-SWCNT dispersion. Under optimized condition of length and average number of interconnecting junctions across the channel full of aligned sc-SWCNTs, field effect transistors (FETs) with high performance were achieved with both a high on/off current ratio and large carrier mobility. Based on the optimized channel length, by systematically optimizing the dielectrophoresis parameters of the frequency and duration of applied AC voltage (Vpp), the highly ordered sc-SWCNTs arrays with an ultra-high linear density of 54±2 tubes/μm showed relatively high device performance of FET. The fabrication process optimized in this report can be further extended and applied in large-area, low-cost carbon-based integrated circuits.

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Heating-Enhanced Dielectrophoresis for Aligned Single-Walled Carbon Nanotube Film of Ultrahigh Density

Cited by 4 publications

References 12 publications

Horizontal Single-Walled Carbon Nanotube Arrays: Controlled Synthesis, Characterizations, and Applications

Horizontal Single-Walled Carbon Nanotube Arrays: Controlled Synthesis, Characterizations, and Applications

Dielectrophoretic alignment of carbon nanotubes: theory, applications, and future

Single layer aligned semiconducting single-walled carbon nanotube array with high linear density

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