Single-walled carbon nanotube membranes for optical applications in the extreme ultraviolet range

Gubarev, V.M.; Yakovlev, V. Ya.; Сертсу, М. Г.; Yakushev, O. F.; Krivtsun, V. M.; Gladush, Yuriy G.; Ostanin, Igor; Sokolov, Andréy; Schäfers, F.; Медведев, В. В.; Nasibulin, Albert G.

doi:10.1016/j.carbon.2019.09.006

Cited by 21 publications

(16 citation statements)

References 35 publications

(15 reference statements)

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“…Carbon nanotube (CNT) films exhibit a unique high porosity/ low-density network structure with thickness values down to a few nanometers. [1][2][3][4] Mechanical, electrical, and optical properties of the CNT films depend greatly on their microstructure, with the CNT orientation (aligned or random network) and density emerging as important parameters in addition to the CNT length and diameter. While manufacturing well-aligned films requires sophisticated synthesis 5 and post-processing, 6 the manipulation of the film density is a less technologically challenging process.…”

Section: Introductionmentioning

confidence: 99%

Densification of single-walled carbon nanotube films: Mesoscopic distinct element method simulations and experimental validation

Drozdov

Ostanin

et al. 2020

Journal of Applied Physics

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Nanometer-thin single-walled carbon nanotube (CNT) films collected from the aerosol chemical deposition reactors have gathered attention for their promising applications. Densification of these pristine films provides an important way to manipulate mechanical, electronic, and optical properties. To elucidate the underlying microstructural level restructuring, which is ultimately responsible for the change in properties, we perform large scale vector-based mesoscopic distinct element method simulations in conjunction with electron microscopy and spectroscopic ellipsometry characterization of pristine and densified films by drop-cast volatile liquid processing. Matching with the microscopy observations, pristine CNT films with a finite thickness are modeled as self-assembled CNT networks comprising entangled dendritic bundles with branches extending down to individual CNTs. Simulations of these films under uniaxial compression uncover a soft deformation regime extending up to an ∼75% strain. When removing the loads, the pre-compressed samples evolve into homogeneously densified films with thickness values depending on both the pre-compression level and the sample microstructure. The significant reduction in thickness is attributed to the underlying structural changes occurring at the 100 nm scale, including the zipping of the thinnest dendritic branches.

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Section: Introductionmentioning

confidence: 99%

Densification of single-walled carbon nanotube films: Mesoscopic distinct element method simulations and experimental validation

Drozdov

Ostanin

et al. 2020

Journal of Applied Physics

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“…However, it does not guarantee good reliable results, as was shown by Barnes et al, where an agreement with an experimental absorption spectrum was demonstrated only within 20%. 15 Besides, the AFM methods are not applicable in the case of freestanding films used in ultrasensitive photodetectors, 5 efficient ultrasound loudspeakers, 36 and extreme UV protective membranes, 37 which makes the preliminary thickness assessment a difficult (or even impossible) task. Another approach proposed by Kuwahara et al 38 is based on thick film optical constants applied as a reference for thin films.…”

mentioning

confidence: 99%

Express determination of thickness and dielectric function of single-walled carbon nanotube films

Ermolaev

Tsapenko

Volkov

et al. 2020

Applied Physics Letters

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Single-walled carbon nanotube (SWCNT) films are promising building blocks for diversified applications in electronics, photovoltaics, and photonics. However, their electrical and optical engineering is still a challenging task owing to multiple obstacles, including the absence of fast and easy-to-use methods for the determination of SWCNT film properties. Here, we present a rapid, contactless, and universal technique for accurate estimation of both SWCNT film thicknesses and their dielectric functions. The approach combines broadband optical absorbance and highly sensitive spectroscopic ellipsometry measurements. The observed linear dependence of the film thickness on its absorbance at 550 nm provides a time-effective and contactless method of thickness assignment, which is of significant importance to the practical implementation of SWCNT films in optoelectronic devices. Additionally, our approach revealed that a simple procedure of film densification allows to controllably alter the dielectric response by at least 40% and, thus, to add extra fine-tuning capabilities during material property engineering. Therefore, this express technique as a whole offers an advanced metrological tool for current and next-generation SWCNT-based devices.

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“…In 633 nm excitation spectrum, the bands between 160 to 210 cm À1 range are ascribed to metallic SWNTs, and the strong peak at 170 cm À1 and the shoulder at 184 cm À1 observed in Fig. 4a could be assigned to the metallic carbon nanotube with indices of (14,5) and (15,3). Whereas, the bands between 125 to 160 cm À1 range are due to semiconducting SWNTs, and the moderate peak at 158 cm À1 could be assigned to the semiconducting carbon nanotube with index of (14,7).…”

Section: The Individualization Of Swnts By N-dodecyl Leucinatementioning

confidence: 92%

“…Single-walled carbon nanotubes (SWNTs) have great potential because of their excellent electronic, thermal, optical, and mechanical properties. [1][2][3] Particularly, individual SWNTs play very important roles in the elds of scanning probe microscope, drug delivery, chemical or biological sensing and miniaturization of electronic circuitry. [4][5][6][7][8] Unfortunately, the available preparation techniques yield inevitably huge and close bundles of SWNTs, which imposes a considerable challenge for their separation and assembly in both aqueous and non-aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

Dispersion of arc-discharged single-walled carbon nanotubes using the natural α-amino acid derivative N-dodecanoyl leucinate

2020

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Single-walled carbon nanotube membranes for optical applications in the extreme ultraviolet range

Cited by 21 publications

References 35 publications

Densification of single-walled carbon nanotube films: Mesoscopic distinct element method simulations and experimental validation

Densification of single-walled carbon nanotube films: Mesoscopic distinct element method simulations and experimental validation

Express determination of thickness and dielectric function of single-walled carbon nanotube films

Dispersion of arc-discharged single-walled carbon nanotubes using the natural α-amino acid derivative N-dodecanoyl leucinate

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