Morphology, Microstructure, and Hydrogen Content of Carbon Nanostructures Obtained by PECVD at Various Temperatures

Gentoiu, Mijaela Acosta; Betancourt-Riera, René; Vizireanu, Sorin; Burducea, I.; Mărăscu, Valentina; Stoica, Silviu Daniel; Biţă, Bogdan; Dinescu, Gheorghe; Riera, R.

doi:10.1155/2017/1374973

Cited by 16 publications

(10 citation statements)

References 37 publications

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“…On the other hand, the occurrence of D-band at 1342 cm −1 corresponded to the disordered or sp 3 -like carbon atoms [27][28][29][30][31], and was rather intense, broad, and asymmetric. Our Raman results are compatible with those reported by Hurtado et al [27], Zhu et al [32], Gentoiu et al [33], and Nasri-Nasrabadi et al [34], regarding systems containing micro/nano structured carbon. More specifically, Zhu et al [32] synthesized carbon nanostructures on Ni-plated commercial hard metal YG6 (WC-6 wt% Co) using a simple ethanol diffusion flame technique.…”

Section: Microstructured Charcoal Characteristicssupporting

confidence: 93%

“…Carbon tubes obtained by this method can be helpful when producing composite solutions of high rheological stability that allows for the omission of time requirements during the extrusion procedure. Our Raman results are compatible with those reported by Hurtado et al [27], Zhu et al [32], Gentoiu et al [33], and Nasri-Nasrabadi et al [34], regarding systems containing micro/nano structured carbon. More specifically, Zhu et al [32] synthesized carbon nanostructures on Ni-plated commercial hard metal YG6 (WC-6 wt% Co) using a simple ethanol diffusion flame technique.…”

Section: Microstructured Charcoal Characteristicssupporting

confidence: 93%

“…It was found that the deposition duration caused both a higher quality and degree of graphitization of flame deposited carbon nanostructures. Gentoiu et al [33] synthesized carbon nanomaterials via injection of acetylene and hydrogen into an argon plasma. At 200 • C, the production of vertical aligned carbon nanotubes was found due to plasma activation.…”

Section: Microstructured Charcoal Characteristicsmentioning

confidence: 99%

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On the Investigation of Microstructured Charcoal as an ANFO Blasting Enhancer

et al. 2020

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In this study, we examined the influence of microstructured charcoal (MC) when added to ammonium nitrate fuel oil (ANFO) samples. We performed a study that investigated ANFOs structure, crystallinity, and morphology by utilizing infrared spectroscopy (IR), X-ray diffraction (XRD), and scanning electron microscopy (SEM), respectively. MC characteristics were probed by Raman spectroscopy and SEM analysis. SEM analysis indicated how fuel oil (FO) covered ammonium nitrate prill. Moreover, the surface of the MC was covered by specific microfibers and microtubes. The disordered graphitic structure of the MC was also confirmed by Raman spectroscopy. Simulation of blasting properties revealed that the addition of MC should decrease blasting parameters like heat explosion, detonation pressure, and detonation temperature. However, the obtained differences are negligible in comparison with the regular ANFO. All analyses indicated that MC was a good candidate as an additive to ANFO.

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Section: Microstructured Charcoal Characteristicssupporting

confidence: 93%

Section: Microstructured Charcoal Characteristicssupporting

confidence: 93%

Section: Microstructured Charcoal Characteristicsmentioning

confidence: 99%

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On the Investigation of Microstructured Charcoal as an ANFO Blasting Enhancer

et al. 2020

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“…Another IBA technique that is utilized for nanostructures characterization relevant to electrochemistry and many other domains is foil-ERDA, which is one of the most sensitive methods for measuring the H content in thin films, such as vertical aligned carbon nanotubes (VA-CNTs), amorphous carbon nanoparticles (CNPs) and carbon nanowalls (CNWs). These three types of nanostructures (VA-CNTs, CNPs and CNWs) were synthesized by varying the substrate deposition temperatures, in the range of 473 to 973 K in steps of 100 K. VA-CNTs were obtained at low temperatures as 473 K, CNPs at temperatures from 573 to 673 K and CNWs at high temperatures from 773 to 973 K [32]. Foil-ERDA (see Fig.…”

Section: Thin Film Analysismentioning

confidence: 99%

Joint research activities at the 3 MV Tandetron™ from IFIN-HH

et al. 2021

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The Horia Hulubei National Institute for Research & Development in Physics and Nuclear Engineering (IFIN-HH) operates, among other facilities, a 3 MV Tandetron™ accelerator, built by High Voltage Engineering Europa B.V. Since commissioning in 2012, the 3 MV Tandetron™ has emerged as an important tool to open new horizons in a variety of accelerator-based research fields.In other words, the 3 MV Tandetron™ accelerator has become one of the key facilities in the landscape of Romanian in both basic research and applications. In addition, our laboratory represents an adequate environment for training young scientists and undergraduates since they can develop marketable skills through accelerator-based research, such as data collection/analysis, software development or simulations. After a brief description of the facility, several prominent highlights defining our research capabilities are described. Finally, our ongoing and future upgrades plan is depicted. IntroductionThe Romanian journey in the field of tandem accelerator-based research began in 1973 with the installation of a 7.5 MV FN Tandem machine, built by the High Voltage Engineering Corporation (HVEC), Bloomington, MA, at the Institute of Atomic Physics (IFA), located at Magurele, outside Bucharest. Later on (after 1990), it was upgraded from the original terminal voltage of 7.5 MV (FN type) to 9 MV, by introducing SF 6 into the insulating gas mixture [1, 2] and replacing the belt with a pelletron. A quick glimpse in the history of our laboratory: in 1977, the Institute of Physics and Nuclear Engineering (IFIN) became was separated from the Institute of Atomic Physics (IFA), and since 1996, IFIN adopted the name of its founder, "Horia Hulubei" National Institute for Research and Development in Physics and Nuclear Engineering (IFIN-HH). To enable the delivery of extra beam-hours, from 3000 to more than 5000 h per year, a series of improvements to the 9 MV accelerator started in 2006 and still continues nowadays; for example, the tandem ion injector was redesigned, two sputtering negative ion sources and a beam pulsing system in the ns and ms range were mounted, and the vacuum system and main power supplies were replaced [3].

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“…The SEM measurements were carried out by means of an Apreo instrument (Thermo Scientific, Waltham, MA, USA), which produces enlarged images of a variety of specimens, achieving magnification of over 100 000 × (ideal conditions), providing high resolution imaging in a digital format. The SEM images were acquired at a working pressure of 1.5 x10 −2 Pa, a working distance between 8-22 mm, and an electron acceleration voltage of 10-25 kV [35][36][37].…”

Section: Investigated Samplesmentioning

confidence: 99%

Enhanced XRF Methods for Investigating the Erosion-Resistant Functional Coatings

2019

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The development of erosion-resistant functional materials usable as plasma facing first wall components (PFC) is crucial for increasing the lifetime of future fusion reactors. Generally, PFCs have to be quality checked and characterized regarding their composition, before integrating them into the fusion reactor vessel. Enhanced X-ray fluorescence (XRF) methods represent an effective alternative to conventional analysis methods for the characterization of refractive metallic coatings on large areas of fusion materials. We have developed and applied XRF methods as fast and robust methods for the characterization of the thickness and composition uniformity of complex functional coatings. These coatings consist of tungsten included in multilayer configuration and deposited on low or high Z substrates. We have further developed customized calibration protocols for quantifying the element composition and layer thickness of each investigated sample. The calibration protocols are based on a combination of standard samples measurements, Monte Carlo simulations, and fundamental parameter theoretical calculations. The calibrated results are discussed considering a selection of relevant PFC samples. The deposition uniformity was successfully investigated for different PFC-relevant tiles and lamella shaped samples with W layers below and over the W L-line saturation thickness. Also, the 2D thickness mapping capability of the XRF method was demonstrated by studying the plasma post-erosion pattern.

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Morphology, Microstructure, and Hydrogen Content of Carbon Nanostructures Obtained by PECVD at Various Temperatures

Cited by 16 publications

References 37 publications

On the Investigation of Microstructured Charcoal as an ANFO Blasting Enhancer

On the Investigation of Microstructured Charcoal as an ANFO Blasting Enhancer

Joint research activities at the 3 MV Tandetron™ from IFIN-HH

Enhanced XRF Methods for Investigating the Erosion-Resistant Functional Coatings

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