Determination of the effective Young’s modulus of vertically aligned carbon nanotube arrays: a simple nanotube-based varactor

Olofsson, Niklas; Ek-Weis, Johan; Eriksson, Anders; Idda, Tonio; Campbell, Eleanor E. B.

doi:10.1088/0957-4484/20/38/385710

Cited by 29 publications

(30 citation statements)

References 15 publications

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“…38,40 Olofsson et al presented a brushlike varactor with two opposing U-shaped VANTA walls (see Fig. 8).…”

Section: B Brushlike Varactormentioning

confidence: 99%

“…8). 40 The VANTAs in their varactor were grown on 200 nm thick Mo electrodes with a 10 nm thick Ti adhesion layer. The catalyst layer was composed of 5 nm Al 2 O 3 and 1 nm Fe deposited on top of the Mo layer.…”

Section: B Brushlike Varactormentioning

confidence: 99%

“…40 These values correspond only to the tunable capacitor and were measured by de-embedding the parasitic capacitance (C parasitic ¼ 5.8 fF). Taking into account the parasitic capacitance, the tunability is calculated using Eq.…”

Section: B Tunability and Parasitic Capacitancesmentioning

confidence: 99%

“…For example Olofsson et al, have measured a series resistance as low as 190 X in their brushlike varactor. 40 They extracted the Q-factor of their varactor from measurements. Their results are plotted in Fig.…”

Section: Quality Factormentioning

confidence: 99%

“…37 The aim of this work is to give a general assessment of carbon based NEMS varactors and to validate their potential using an analytical model developed here, as well as published experimental data. [38][39][40][41][42][43] Since carbon based varactors are still in emergence, this review focuses on their potential advantages and remaining challenges. First, a short review of existing varactor technologies is given.…”

mentioning

confidence: 99%

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Vertically aligned carbon based varactors

Ghavanini

Enoksson

Bengtsson

et al. 2011

Journal of Applied Physics

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This paper gives an assessment of vertically aligned carbon based varactors and validates their potential for future applications. The varactors discussed here are nanoelectromechanical devices which are based on either vertically aligned carbon nanofibers or vertically aligned carbon nanotube arrays. A generic analytical model for parallel plate nanoelectromechanical varactors based on previous works is developed and is used to formulate a universal expression for their voltage-capacitance relation. Specific expressions for the nanofiber based and the nanotube based varactors are then derived separately from the generic model. This paper also provides a detailed review on the fabrication of carbon based varactors and pays special attention to the challenges in realizing such devices. Finally, the performance of the carbon based varactor is assessed in accordance with four criteria: the static capacitance, the tuning ratio, the quality factor, and the operating voltage. Although the reported performance is still far inferior to other varactor technologies, our prognosis which stems from the analytical model shows a promise of a high quality factor as well as a potential for high power handling for carbon based varactors.

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“…38,40 Olofsson et al presented a brushlike varactor with two opposing U-shaped VANTA walls (see Fig. 8).…”

Section: B Brushlike Varactormentioning

confidence: 99%

Section: B Brushlike Varactormentioning

confidence: 99%

Section: B Tunability and Parasitic Capacitancesmentioning

confidence: 99%

Section: Quality Factormentioning

confidence: 99%

mentioning

confidence: 99%

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Vertically aligned carbon based varactors

Ghavanini

Enoksson

Bengtsson

et al. 2011

Journal of Applied Physics

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Vertically Aligned Carbon Nanotubes as Platform for Biomimetically Inspired Mechanical Sensing, Bioactive Surfaces, and Electrical Cell Interfacing

Schneider

2017

Adv. Biosys.

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Vertically aligned carbon nanotubes (VACNTs) are one dimensional carbon objects anchored atop of a solid substrate. They are geometrically fixed in contrast to their counterparts, randomly oriented carbon nanotubes (CNTs). In this progress report, the breadth in which these one dimensional, mechanically flexible, though robust and electrical conducting carbon nanostructures can be employed as functional material is shown and our research is put in perspective to work in the last five to ten years. The connection between the different areas touched in this report is the biomimetic‐materials approach, which rely on the hairy morphology of VACNTs. These properties in connection with their electrical conductivity offer possibilities towards new functional features and applications of VACNTs. To appreciate the possibilities of biomimetic research with VACNTs, first their material characteristics are given to make the reader familiar with specific features of their synthesis, the peculiarities in arranging and controlling the morphology of CNTs in a vertical alignment as well as a current understanding of these properties on a microscopic basis. In doing so, similarities as well as differences, which offer new possibilities for biomimetic studies of VACNTS with respect to multiwalled randomly oriented CNTs, will become clear.

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Superstrong Ultralong Carbon Nanotubes for Mechanical Energy Storage

Wei¹,

Wen²,

Qian³

et al. 2011

Advanced Materials

179

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Superstrong, ultralong, individual carbon nanotubes (CNTs) are deposited with TiO2 particles and visualized under an optical microscope with excellent strain‐relaxation reversibility and high fatigue resistance capability. The CNTs with perfect structures have tensile strengths of up to 200 GPa, densities to 1.34 TPa, energy density as high as 1125 Wh kg−1 and the power density can be up to 144 MW kg−1 for mechanical energy storage. The superb mechanical properties confirm the potential of an individual CNT as an effective storage medium with mechanical energy for nano‐electromechanical systems, flexible devices, sensors, actuators, antennas, etc.

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Determination of the effective Young’s modulus of vertically aligned carbon nanotube arrays: a simple nanotube-based varactor

Cited by 29 publications

References 15 publications

Vertically aligned carbon based varactors

Vertically aligned carbon based varactors

Vertically Aligned Carbon Nanotubes as Platform for Biomimetically Inspired Mechanical Sensing, Bioactive Surfaces, and Electrical Cell Interfacing

Superstrong Ultralong Carbon Nanotubes for Mechanical Energy Storage

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