Shake up satellites and fluorescence property of carbon nitride and hydrogenated carbon nitride: Annealing effect

Nitrogen-containing multi-wall carbon nanotubes (N-MWCNTs) were synthesized using aerosol assisted chemical vapor deposition (CVD) techniques in conjunction with benzylamine:ferrocene or acetonitrile: ferrocene mixtures. Different amounts of toluene were added to these mixtures in order to change the N/C ratio of the feedstock. X-ray photoelectron and near-edge X-ray absorption fine structure spectroscopy detected pyridinic, pyrrolic, graphitic, and molecular nitrogen forms in the N-MWCNT samples. Analysis of the spectral data indicated that whilst the nature of the nitrogen-containing precursor has little effect on the concentrations of the different forms of nitrogen in N-MWCNTs, the N/C ratio in the feedstock appeared to be the determining factor. When the N/C ratio was lower than ca. 0.01, all four forms existed in equal concentrations, for N/C ratios above 0.01, graphitic and molecular nitrogen were dominant. Furthermore, higher concentrations of pyridinic nitrogen in the outer shells and N 2 molecules in the core of the as-produced N-MWCNTs suggest that the precursors were decomposed into individual atoms, which interacted with the catalyst surface to form CN and NH species or in fact diffused through the bulk of the catalyst particles. These findings are important for a better understanding of possible growth mechanisms for heteroatom-containing carbon nanotubes (CNTs) and therefore paving the way for controlling the spatial distribution of foreign elements in the CNTs using CVD processes.

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“…2b). The vibration of the triple CRN bond is expected around 2220 cm À1 , 45 and there the spectrum showed a negligible absorption (Fig. 5).…”

Section: View Article Onlinementioning

confidence: 94%

Controlling pyridinic, pyrrolic, graphitic, and molecular nitrogen in multi-wall carbon nanotubes using precursors with different N/C ratios in aerosol assisted chemical vapor deposition

Bulusheva

Окотруб

Fedoseeva

et al. 2015

Phys. Chem. Chem. Phys.

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“…The XPS spectrum of C atoms is composed of three characteristic peaks including C1S (284.72 eV), defect peak (288.83 eV), and sp 2 C−N (286.15 eV); the last peak proves the covalent bonding of C and N atoms as shown in Figure 4b. 32,33 The XPS spectrum of N atoms is composed of two peaks, the N1S peak (398.18 eV) and the C−N peak; the latter also suggests that part of N atoms bond with C atoms as shown in Figure 4c. 22 The peaks at a binding energy of 190.7 eV is attributed to B1S in h-BN, and the peak of 190.2 eV is ascribed to C−B bonding due to a lower electronegativity of C than N. 23,34 The C−N and C−B bonds are located at the boundaries between the h-BN and graphene domains, or the inner of the C doped h-BN domains or BN doped graphene domains, or the inner of the true ternary B− N−C domains.…”

Section: Figure S2) a Quantum Valley Hall Conductance C E H Vmentioning

confidence: 99%

Valley Pseudospin with a Widely Tunable Bandgap in Doped Honeycomb BN Monolayer

Song¹,

Wang

Bai

et al. 2017

Nano Lett.

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Valleytronics is a promising paradigm to explore the emergent degree of freedom for charge carriers on the energy band edges. Using ab initio calculations, we reveal that the honeycomb boron nitride (h-BN) monolayer shows a pair of inequivalent valleys in the vicinities of the vertices of hexagonal Brillouin zone even without the protection of the C symmetry. The inequivalent valleys give rise to a 2-fold degree of freedom named the valley pseudospin. The valley pseudospin with a tunable bandgap from deep ultraviolet to far-infrared spectra can be obtained by doping h-BN monolayer with carbon atoms. For a low-concentration carbon periodically doped h-BN monolayer, the subbands with constant valley Hall conductance are predicted due to the interaction between the artificial superlattice and valleys. In addition, the valley pseudospin can be manipulated by visible light for high-concentration carbon doped h-BN monolayer. In agreement with our calculations, the circularly polarized photoluminescence spectra of the BNC sample show a maximum valley-contrasting circular polarization of 40% and 70% at room temperature and 77 K, respectively. Our work demonstrates a class of valleytronic materials with a controllable bandgap.

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“…The differences in integrated area in C1s spectra designated to C-O or C-P groups and overall O-content are affected by shake-up satellites of carbon corresponding to C-C-binding. [52][53][54] Further details on this matter are described in the ESI †.…”

Section: Phase Parametermentioning

confidence: 99%

P-containing coated carbons from phosphonium ionic liquids as catalyst supports for fuel cell applications

Severin

Rauber

Philippi

et al. 2023

Sustainable Energy Fuels

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Shake up satellites and fluorescence property of carbon nitride and hydrogenated carbon nitride: Annealing effect

Cited by 14 publications

References 40 publications

Controlling pyridinic, pyrrolic, graphitic, and molecular nitrogen in multi-wall carbon nanotubes using precursors with different N/C ratios in aerosol assisted chemical vapor deposition

Controlling pyridinic, pyrrolic, graphitic, and molecular nitrogen in multi-wall carbon nanotubes using precursors with different N/C ratios in aerosol assisted chemical vapor deposition

Valley Pseudospin with a Widely Tunable Bandgap in Doped Honeycomb BN Monolayer

P-containing coated carbons from phosphonium ionic liquids as catalyst supports for fuel cell applications

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