Aging phenomena and wettability control of plasma deposited carbon nanowall layers

Vizireanu, Sorin; Ionita, Maria Daniela; Ionita, Rosini E.; Stoica, Silviu Daniel; Teodorescu, Cristian M.; Husanu, Marius-Adrian; Apostol, Nicoleta G.; Baibarac, M.; Panaitescu, Denis Mihaela; Dinescu, Gheorghe

doi:10.1002/ppap.201700023

Cited by 22 publications

(12 citation statements)

References 74 publications

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“…The results indicate that the wettability of the CNW surfaces grown with all oxygen flow rates was not significantly affected by the crystallinity. As described in Section 2.1 , the surface condition of the CNWs was stable and hydrophobic because the CNWs were more than 14 days old, which was consistent with previous research [ 33 ]. It has been reported that differences in wettability affect the sensitivity for detection [ 9 ].…”

Section: Resultssupporting

confidence: 89%

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Effects of High-Quality Carbon Nanowalls Ionization-Assisting Substrates on Surface-Assisted Laser Desorption/Ionization Mass Spectrometry Performance

Sakai

Kondo²,

Ishikawa³

et al. 2022

Nanomaterials

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Surface-assisted laser desorption/ionization mass spectrometry (SALDI-MS) is performed using carbon nanowalls (CNWs) for ionization-assisting substrates. The CNWs (referred to as high-quality CNWs) in the present study were grown using a radical-injection plasma-enhanced chemical vapor deposition (RI-PECVD) system with the addition of oxygen in a mixture of CH4 and H2 gases. High-quality CNWs were different with respect to crystallinity and C–OH groups, while showing similar wall-to-wall distances and a wettability comparable to CNWs (referred to as normal CNWs) grown without O2. The efficiency of SALDI was tested with both parameters of ion intensity and fragmental efficiency (survival yield (SY)) using N-benzylpyridinuim chloride (N-BP-CI). At a laser fluence of 4 mJ/cm2, normal CNWs had an SY of 0.97 and an ion intensity of 0.13, while 5-sccm-O2– high-quality CNWs had an SY of 0.89 and an ion intensity of 2.55. As a result, the sensitivity for the detection of low-molecular-weight analytes was improved with the high-quality CNWs compared to the normal CNWs, while an SY of 0.89 was maintained at a low laser fluence of 4 mJ/cm2. SALDI-MS measurements available with the high-quality CNWs ionization-assisting substrate provided high ionization and SY values.

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Section: Resultssupporting

confidence: 89%

“…In the present experiment, CNWs that were at least 14 days old after growth were used because it has been reported that the CNW edges initially contain many defects and the surfaces become highly hydrophobic over time with inert and stable terminations [ 33 ].…”

Section: Methodsmentioning

confidence: 99%

Effects of High-Quality Carbon Nanowalls Ionization-Assisting Substrates on Surface-Assisted Laser Desorption/Ionization Mass Spectrometry Performance

Sakai

Kondo²,

Ishikawa³

et al. 2022

Nanomaterials

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“…We suppose that the defects (dangling bonds) are terminated with hydrogen atoms. However, well-ordered CNT and CNW contain a lower defect density [26,27] in comparison to amorphous carbon nanoparticles.…”

Section: Erda Measurementsmentioning

confidence: 99%

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

Gentoiu

Betancourt-Riera

Vizireanu

et al. 2017

Journal of Nanomaterials

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Carbon nanostructures were obtained by acetylene injection into an argon plasma jet in the presence of hydrogen. The samples were synthesized in similar conditions, except that the substrate deposition temperatures were varied, ranging from 473 to 973 K. A strong dependence of morphology, structure, and graphitization upon was found. We obtained vertical aligned carbon nanotubes (VA-CNTs) at low temperatures as 473 K, amorphous carbon nanoparticles (CNPs) at temperatures from about 573 to 673 K, and carbon nanowalls (CNWs) at high temperatures from 773 to 973 K. Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, elastic recoil detection analysis, X-ray photoelectron spectroscopy, and Raman spectroscopy were used to substantiate the differences in these material types. It is known that hydrogen concentration modifies strongly the properties of the materials. Different concentrations of hydrogen-bonded carbon could be identified in amorphous CNP, VA-CNT, and CNW. Also, the H : C ratios along depth were determined for the obtained materials.

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“…By using a mask of 5 mm × 5 mm, carbon nanowall (CNW) structures were grown by plasmaenhanced chemical vapour deposition (PECVD). The detailed growth procedure of the CNW structure can be found in [29], but for this study, the working time was 1 hour. Two types of CNW architectures denoted here CNWs-1050 and CNWs-1400 were fabricated onto the SiO 2 /Ti/Pt dig structure by using two different gas mixture ratios of Ar/H 2 /C 2 H 2 as 1050/25/2 sccm and 1400/25/2 sccm, respectively.…”

Section: Methodsmentioning

confidence: 99%

On the Structural, Morphological, and Electrical Properties of Carbon Nanowalls Obtained by Plasma-Enhanced Chemical Vapor Deposition

Biţă

Vizireanu

Stoica

et al. 2020

Journal of Nanomaterials

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In this study, we investigated the morphological, structural, and electrical properties of carbon nanowall (CNW) structures obtained by plasma-enhanced chemical vapour deposition (PECVD) and underlined the induced effects of argon/nitrogen (Ar/N2) postsynthesis plasma treatment on the electrical behaviour. The top view and cross-section scanning electron microscopy micrographs revealed that the fabricated samples are about 18 μm height, and the edges are less than 10 nm. The Raman analysis showed the presence of the specific peaks of graphene-based materials, i.e., D-band, G-band, D′-band, 2D-band, and D+G-band. The average values of the electrical resistance of fabricated samples were evaluated by current-voltage characteristics acquired at room temperature, in the ranges of 0 V–0.2 V, and an increase was noticed with about 50% after the Ar/N2 postsynthesis plasma treatment compared to pristine samples. Moreover, the Hall measurements proved that the obtained CNW structures had p-type conductivity (Hall coefficient was 0.206 m3/C), and the concentration of charge carriers was 7.8×1019 cm-3, at room temperature.

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Aging phenomena and wettability control of plasma deposited carbon nanowall layers

Cited by 22 publications

References 74 publications

Effects of High-Quality Carbon Nanowalls Ionization-Assisting Substrates on Surface-Assisted Laser Desorption/Ionization Mass Spectrometry Performance

Effects of High-Quality Carbon Nanowalls Ionization-Assisting Substrates on Surface-Assisted Laser Desorption/Ionization Mass Spectrometry Performance

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

On the Structural, Morphological, and Electrical Properties of Carbon Nanowalls Obtained by Plasma-Enhanced Chemical Vapor Deposition

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