<i>In situ</i> Raman spectroscopy for growth monitoring of vertically aligned multiwall carbon nanotubes in plasma reactor

Labbaye, Thibault; Canizarès, A.; Gaillard, Mireille; Lecas, Thomas; Kovačević, Eva; Boulmer‐Leborgne, Chantal; Strunskus, Thomas; Raimboux, N.; Simon, Patrick; Guimbretière, Guillaume; Ammar, Mohamed‐Ramzi

doi:10.1063/1.4902915

Cited by 18 publications

(9 citation statements)

References 30 publications

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“…The detailed description of the PECVD reactor and the growth of multi-wall CNTs (MWNTs) was reported in our previous studies [49,50]. In these experimental studies, the growth of MWNTs is achieved on a Si substrate using Ni nanocatalyst by PECVD in three steps.…”

Section: Methodsmentioning

confidence: 99%

Nanoscale mechanisms of CNT growth and etching in plasma environment

Khalilov¹,

Bogaerts²,

Hussain³

et al. 2017

J. Phys. D: Appl. Phys.

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Plasma-enhanced chemical deposition (PECVD) of carbon nanotubes has already been shown to allow chirality control to some extent. In PECVD, however, etching may occur simultaneously with the growth, and the occurrence of intermediate processes further significantly complicates the growth process. We here employ a computational approach with experimental support to study the plasmabased formation of Ni nanoclusters, Ni-catalyzed CNT growth and subsequent etching processes, in order to understand the underpinning nanoscale mechanisms. We find that hydrogen is the dominant factor in both the restructuring of a Ni film and the subsequent appearance of Ni nanoclusters, as well as in the CNT nucleation and etching processes. The obtained results are compared with available theoretical and experimental studies and provide a deeper understanding of the occurring nanoscale mechanisms in plasma-assisted CNT nucleation and growth.

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Section: Methodsmentioning

confidence: 99%

Nanoscale mechanisms of CNT growth and etching in plasma environment

Khalilov¹,

Bogaerts²,

Hussain³

et al. 2017

J. Phys. D: Appl. Phys.

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“…Spectra were acquired at the C and O K-edges, in the total and partial energy electron yield (TEY and PEY) mode. The raw spectra were normalized to the incident photon flux and corrected for the beam line transmission by division through a spectrum which was obtained with a sputtered Au sample [26][27][28]. The monochromator energy scale was calibrated using the carbon K-edge π* transition of graphite, located at 285.4 eV.…”

Section: Nexafs Spectroscopymentioning

confidence: 99%

Characterization of functionalized coatings prepared from pulsed plasma polymerization

Jagodar²,

Kovačević³

et al. 2021

Materials Chemistry and Physics

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Material assembly based on elastomer part and metallic substrate has been widely used in many industrial sectors. However, the adhesion between the two materials requests specific processes and adhesives. Plasma technology is an interesting way to prepare the assembly since the plasma polymer layers used for the adhesive joint can bear different reactive chemical functions toward the elastomer. Three different plasma coatings are synthesized from acetylene, acrylic acid, and maleic anhydride plasma because of their respective chemical functions able to open the carbon-carbon double bond of the elastomer (rubber, fluoroelastomer). For such a purpose, finetuning of plasma parameters was essential to preserve the precursor chemistry and to avoid any degradation. Pulsed plasma discharge was selected, plasma parameters defined thanks to the design of experiment. The different plasma polymers were characterized by FTIR, XPS and NEXAFS spectroscopies and surface energy measurement.

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Section: Introductionmentioning

confidence: 99%

“…Since the beginning of the 2000s, long working distance systems based on high resolution commercial devices are coupled with other instruments. 9,10 Handheld instruments are also commonly used in geology 11 or astrobiology. 12,13 The coupling of particle irradiation with in situ Raman detection is particularly relevant for present and future missions to Mars dedicated to the search for traces of life and organic molecules.…”

Section: Introductionmentioning

confidence: 99%

In Situ Raman Spectroscopy Monitoring of Material Changes During Proton Irradiation

et al. 2022

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Organic molecules are prime targets in the search for life on other planetary bodies in the Solar System. Understanding their preservation potential and detectability after ionic irradiation, with fluences potentially representing those received for several millions to billions of years at Mars or in interplanetary space, is a crucial goal for astrobiology research. In order to be able to perform in situ characterization of such organic molecules under ionic irradiation in the near future, a feasibility experiment was performed with polymer test samples to validate the optical configuration and the irradiation chamber geometry. We present here a Raman in situ investigation of the evolution of a series of polymers during proton irradiation. To achieve this goal, a new type of Raman optical probe was designed, which documented that proton irradiation (with a final fluence of 3.1014 at·cm–2) leads to an increase in the background level of the signal, potentially explained by the scission of the polymeric chains and by atom displacements creating defects in the materials. To improve the setup further, a micro-Raman probe and a temperature-controlled sample holder are under development to provide higher spectral and spatial resolutions (by reducing the depth of field and laser spot size), to permit Raman mapping as well as to avoid any thermal effects.

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In situ Raman spectroscopy for growth monitoring of vertically aligned multiwall carbon nanotubes in plasma reactor

Cited by 18 publications

References 30 publications

Nanoscale mechanisms of CNT growth and etching in plasma environment

Nanoscale mechanisms of CNT growth and etching in plasma environment

Characterization of functionalized coatings prepared from pulsed plasma polymerization

In Situ Raman Spectroscopy Monitoring of Material Changes During Proton Irradiation

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