Structural analysis of carbon nanospheres synthesized by CVD: an investigation of surface charges and its effect on the stability of carbon nanostructures

Singhal, Sonal; Dixit, Saurabh; Shukla, A. K.

doi:10.1007/s00339-018-2372-0

Cited by 16 publications

(5 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Singhal et al reported that Fe, as a catalyst, plays an essential role in forming carbon nanotubes. In contrast, CµSs are synthesized directly by a mixture of xylene and benzene, at 900 • C, in the absence of a catalyst [23].…”

Section: Discussionmentioning

confidence: 99%

Development of Microstructured Carbon Coatings by Substrate-Catalytic CVD

2021

View full text Add to dashboard Cite

Carbon nanostructured films were synthesized by chemical vapor deposition (CVD) on H18 stainless steel (AISI 440C) sheets with an H2/CH4/N2 gas mixture at various substrate temperatures. During the synthesis, the iron and chromium oxide layer was formed between the steel and carbonaceous layer. The carbon films exhibited wall-like and spherical morphologies and structures, as characterized by scanning electron microscopy and Raman spectroscopy. It was found that the synthesis temperature affects the microsphere density and, therefore, also in the electrochemical behavior. The electrochemical behavior of nanostructured carbon coatings strongly depends on the CVD deposition conditions. The best corrosion resistance (Rp = 11.8 MΩ·cm2, Icorr = 4.4 nA·cm−2) exhibits a nanostructured carbon sample with a moderate amount of sp2-C-rich carbon microspheres CμSs synthesized at 700 °C. The corrosion resistance of the nanostructured carbon coating is better than raw stainless steel.

show abstract

Section: Discussionmentioning

confidence: 99%

Development of Microstructured Carbon Coatings by Substrate-Catalytic CVD

2021

View full text Add to dashboard Cite

show abstract

“…Furthermore, CNSs are negatively charged, and they can be changed while modifying with surfactants (anionic and cationic) [30]. As a result, CNSs modified with surfactant exhibit good stability.…”

Section: Surface Properties and Functionalization Of Carbonmentioning

confidence: 99%

Preparation of catalyst from natural montmorillonite mineral and its application in the synthesis of carbon nanosphere

et al. 2022

View full text Add to dashboard Cite

In developed countries, nanoparticles derived from natural minerals and high-purity chemicals both are widely studied, while in developing countries like Mongolia, the natural minerals-based nanoparticles have more interest because of the low production cost and applicability of domestic natural minerals for their production. For the synthesis of natural mineral-based nanomaterials, it is important first to define the chemical composition and physical structure of local minerals and their possible processing route. We employed an environmentally friendly alkaline leaching procedure to recover silica from the clay mineral at 90°C for 24 hours. We applied an organic surfactant (CTAB) and a simple coprecipitation approach to form iron-doped silica nanoparticles. Consequently, we used iron-doped silica nanoparticles as a substrate and catalyst for the synthesis of carbon nanosphere at 750 °C for 1 hour in an argon and acetylene gas atmosphere. As a result, vast quantities of superhydrophobic carbon nanospheres (CNS) were obtained. The physicochemical properties of nanosilica substrate, non-functionalized carbon nanosphere, and functionalized carbon nanosphere (CNS) samples were characterized using XRD, XRF, SEM, EDS, TEM, and FTIR spectrometer. Iron-doped mineral-derived nanosilica particles demonstrated high catalytic efficiency and the potential to produce a large amount of value-added carbon nanospheres. Superhydrophobic CNS can be used in a variety of applications, particularly drug delivery; however, to use CNS in both aqueous and non-aqueous media, the superhydrophobic properties of CNS can be modified using different oxidizers. The changes in hydrophobicity of the CNS were examined and suggested possible oxidizing agents.

show abstract

“…Later, Serp and co-authors [12] proposed a classification for carbon spheres according to their size as (i) onion-like structures with diameters between 2 and 20 nm, (ii) carbon nanosized spheres with less graphitized structures and diameters between 50 nm and 1 μm, and (iii) carbon beads with diameters of one to several microns. Different synthetic routes can be used to produce carbon nanospheres, such as laser ablation [13], solvothermal and hydrothermal methods [14][15][16], and chemical vapor deposition (CVD) [12,[17][18][19][20][21]; hollow [22,23] and mesoporous [8,24] carbon nanospheres have also been reported. Spherical, sulfur-rich, carbon nanoparticles have also been produced by the thermal decomposition of waste tires [25].…”

Section: Introductionmentioning

confidence: 99%

“…Spherical, sulfur-rich, carbon nanoparticles have also been produced by the thermal decomposition of waste tires [25]. In particular, the CVD method has been explored using metallic catalysts, [12,18] however, it has been reported that the pyrolysis of hydrocarbons does not require metallic catalysts for the production of nanospheres, [17,[19][20][21] while the presence of catalysts, under the right conditions, induces the self-assembly of carbon nanotubes [21]. The non-catalytic atmospheric pressure pyrolysis of hydrocarbons yields solid nanospheres in the concentric configuration with diameters that depend on the synthesis conditions (temperature, flow rate, synthesis time, precursor, carrier gas) and that are prone to present accretion [17,19,20].…”

Section: Introductionmentioning

confidence: 99%

“…Even though CVD-produced carbon nanospheres possess a low content of oxygenated groups [12,18], their carbonaceous nature dictates a hydrophobic behavior, hence surface modification becomes essential. Such surface modifications are often carried out chemically post-synthesis and involve strong acids, long treatments, and repeated washing procedures to eliminate residues [26,27] or the stabilization by means of appropriate capping agents [21]. Xiao and coauthors [14] have reported the solvothermal synthesis of hydrogenated carbon nanospheres using chloroform and potassium, although this method does not require postsynthesis treatments, the synthesis requires long periods (10 h), hazardous reactants and the materials have to be washed several times in order to be purified and then dried for 12 h.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Simple in situ functionalization of carbon nanospheres

et al. 2020

View full text Add to dashboard Cite

Functionalized carbon nanospheres have been synthesized in situ via a facile chemical vapor deposition strategy, fabricated by the pyrolysis of toluene/ethanol mixtures at different percentages (0, 1, 2, 3, 4, and 5 wt% of ethanol). The as-grown nanospheres have been characterized using transmission electron microscopy, scanning electron microscopy, Raman and Fourier transform infrared spectroscopy, x-ray diffraction, nitrogen adsorption, zeta potential measurements and x-ray photoelectron spectroscopy. Results indicate that the incorporation of ethanol in the precursor solution reflected in the presence of oxygen and hydrogen functional groups, the highest functionalized nanospheres without compromising the morphology of the sample were yielded at 3 wt% concentration. These in situ added functional groups rendered the carbon nanostructures enhancedly dispersible and stable in water, avoiding post-synthesis and harsh chemicals processing; envisaging thus applications of the nanospheres in the biomedical field where hydrophilicity of the nanomaterials is mandatory.

show abstract

Structural analysis of carbon nanospheres synthesized by CVD: an investigation of surface charges and its effect on the stability of carbon nanostructures

Cited by 16 publications

References 43 publications

Development of Microstructured Carbon Coatings by Substrate-Catalytic CVD

Development of Microstructured Carbon Coatings by Substrate-Catalytic CVD

Preparation of catalyst from natural montmorillonite mineral and its application in the synthesis of carbon nanosphere

Simple in situ functionalization of carbon nanospheres

Contact Info

Product

Resources

About