Synthesis of Hybrid Carbon Materials Consisting of N-Doped Microporous Carbon and Amorphous Carbon Nanotubes

Abstract

<jats:p>The N-doped hybrid carbon materials containing amorphous carbon nanotubes (ACNTs) were obtained by free growth of a polymer at 200 °C. The improvement of electrical conductivity was achieved by a final carbonization at 600–800 °C under the flow of nitrogen. The microstructure of ACNT/N-doped hybrids was characterized using a transmission electron microscope and X-ray diffusion. Furthermore, their elemental composition was measured using energy-dispersive X-ray spectroscopy and an elemental analyzer. The experimental results indicated that the ACNTs had a diameter in the range of 40–60 nm and the N-doped carbon background contained nitrogen atoms in most bonded pyrrolic-N and quaternary-N groups. The results revealed that the microstructure of the as-grown nanotubes, prepared by the proposed method, is mainly amorphous. This technique introduces the advantages of low cost and process simplicity, which may redeem some drawbacks of the methods commonly used in ACNT synthesis.</jats:p>

Preparation of Zirconium Hydrogen Phosphate Coatings on Sandblasted/Acid-Etched Titanium for Enhancing Its Osteoinductivity and Friction/Corrosion Resistance

“…Moreover, the fitting results ( Figure S1 ) further displayed that C1s could be decomposed into amorphous carbon, C=C, and C-OH in both SLA-ZrP0.5 and SLA-ZrP0.7. Previous study has revealed that the peaks of amorphous carbon and C=C were associated with the hybridization of carbon sp2, 43 which were also closely related to the appearance of D and G bands in the resulting Raman ( Figure 3B ). The C-OH in samples might be caused by environmental contamination.…”

Enhanced Four‐Electron Selective Oxygen Reduction Reaction at Carbon‐Nanotube‐Supported Sulfonic‐Acid‐Functionalized Copper Phthalocyanine

“…The XPS survey spectrum of NMWCNTs (Figure S5) confirms the existence of the elements, carbon, nitrogen, and oxygen. The de‐convoluted C 1s spectrum shows that the C is present in five forms as C=C, C−C, C−O/C−N, and C=O at the binding energy values of 284.5, 284.8, 285.4, and 286.6 eV [55,56] . The N 1s spectrum is de‐convoluted to four peaks representing four types of N species corresponding to pyridinic N (399.0 eV), pyrrolic N (400.0 eV), graphitic N (401.2 eV), and oxidized N (406.7 eV) in the NMWCNTs [57,58] .…”

“…The de-convoluted C 1s spectrum shows that the C is present in five forms as C=C, CÀ C, CÀ O/CÀ N, and C=O at the binding energy values of 284.5, 284.8, 285.4, and 286.6 eV. [55,56] The N 1s spectrum is de-convoluted to four peaks representing four types of N species corresponding to pyridinic N (399.0 eV), pyrrolic N (400.0 eV), graphitic N (401.2 eV), and oxidized N (406.7 eV) in the NMWCNTs. [57,58] The spectrum shows the highest intensity for the graphitic N which confirms the successful doping of N in the MWCNTs.…”

Flax-Derived Carbon: A Highly Durable Electrode Material for Electrochemical Double-Layer Supercapacitors

“…The Raman spectrum of the C-Flax sample ( Figure 1 c) showed two distinct peaks indexed as D-band (1334 cm –1 ) and G-band (1596 cm –1 ). The presence of the first was related to internal structural defects, edge defects, and dandling bonds (i.e., disorder-induced defects of graphitic carbon [ 35 ]), and the amorphous nature of carbon [ 36 ], while the latter came from the stretching mode of symmetric C–C bonds [ 37 ]. The D-band (ID) vs. G-band (IG) ratio was 1.21, which indicated a large number of structural disorders and a partially graphitic structure of this sample.…”

“…phitic carbon [35]), and the amorphous nature of carbon [36], while the latter came from the stretching mode of symmetric C-C bonds [37]. The D-band (ID) vs. G-band (IG) ratio was 1.21, which indicated a large number of structural disorders and a partially graphitic structure of this sample.…”