Thermal expansion dependence on the sp2 concentration of amorphous carbon and carbon nitride

Champi, A.; Lacerda, R. G.; Viana, G.A.; Marques, F. C.

doi:10.1016/j.jnoncrysol.2004.03.028

Cited by 12 publications

(8 citation statements)

References 20 publications

(23 reference statements)

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“…In addition, some nanowires, depicted in Figure (c,d), may have indirectly indicated the presence of a large number of short chains, and this could have led to the expansion. However, previous studies with g ‐C 3 N 4 also showed that nitrogen incorporation for ag‐C 3 N 4 favored the formation of terminal atoms, such as H and Cl, and terminal groups to suppress the expansion, in particular when N was involved in an ordered and sp 2 ‐bonded structure . Furthermore, ag‐C 3 N 4 had a relatively large surface size (918 nm) and a triazine‐rich structure.…”

Section: Resultsmentioning

confidence: 99%

Comparison of graphene oxide and graphitic carbon nitride filled carbon–phenolic composites: Thermomechanical properties and role of the strong electronegativity of nanofillers

Yang

Lü

et al. 2018

J of Applied Polymer Sci

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Carbon–phenolic (CF–PR) composites with 0.1 wt % graphene oxide (GO) and acidified graphitic carbon nitride (ag‐C3N4) were synthesized and characterized to understand their thermal properties. The thermal conductivity, coefficient thermal expansion, dynamic mechanical analysis, and scanning electron microscopy were used in our experimental efforts. The results demonstrate that the ag‐C3N4‐filled composite had 17.17% and 54% reductions in the thermal conductivity and coefficient thermal expansion, respectively, when compared with the neat composite, although the GO‐filled showed a 8.54% decrease and a 30% increase, respectively. Furthermore, reactive molecular dynamics simulation was used to investigate the mechanisms at the atomistic level when the composites are subjected to thermal behavior. The simulated results show that the influence of GO and ag‐C3N4 on the thermal conductivities of the composites was different. Lowly loaded GO favored the more interfacial thermal resistance. However, the stronger electronegativity in ag‐C3N4 favored the formation of a vacuum zone in the matrix; this contributed to increasing the interfacial boundaries and defect scattering. The simulation results are expected to be of great help to serve as a guide for further experiments concerning the thermal properties. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46242.

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Section: Resultsmentioning

confidence: 99%

Comparison of graphene oxide and graphitic carbon nitride filled carbon–phenolic composites: Thermomechanical properties and role of the strong electronegativity of nanofillers

Yang

Lü

et al. 2018

J of Applied Polymer Sci

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“…Several works have focused on the relation between the material physical properties and the different amounts and distribution of sp 2 and sp 3 hybridized carbon into the matrix. [1][2][3][4][5][6][7][8][9][10] Other researches focused on how to produce a matrix with some specific characteristic, usually for a well defined application, such as high hardness, chemical inertness, low friction coefficient and low electron affinity. [11][12][13][14][15][16] Today, it is well known which technique is appropriate to produce amorphous carbon films with some specific characteristic.…”

Section: Introductionmentioning

confidence: 99%

Influence of krypton atoms on the structure of hydrogenated amorphous carbon deposited by plasma enhanced chemical vapor deposition

Oliveira

Viana

Lima

et al. 2010

Journal of Applied Physics

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Hydrogenated amorphous carbon ͑a-C:H͒ films were prepared by plasma enhanced chemical vapor deposition using methane ͑CH 4 ͒ plus krypton ͑Kr͒ mixed atmosphere. The depositions were performed as function of the bias voltage and krypton partial pressure. The goal of this work was to study the influence of krypton gas on the physical properties of a-C:H films deposited on the cathode electrode. Krypton concentration up to 1.6 at. %, determined by Rutherford Back-Scattering, was obtained at high Kr partial pressure and bias of Ϫ120 V. The structure of the films was analyzed by means of optical transmission spectroscopy, multi-wavelength Raman scattering and Fourier Transform Infrared spectroscopy. It was verified that the structure of the films remains unchanged up to a concentration of Kr of about 1.0 at. %. A slight graphitization of the films occurs for higher concentration. The observed variation in the film structure, optical band gap, stress, and hydrogen concentration were associated mainly with the subplantation process of hydrocarbons radicals, rather than the krypton ion energy.

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“…The dashed line displays the simulation results assuming the material parameters of Si and a-C under equilibrium conditions as reported in literature. 9,[16][17][18][19][20] From this simulation, a time constant of about 3 ns is predicted for the film thickness and density relaxation. Experimentally, the thin film relaxation process is found to be about a factor 2 faster.…”

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confidence: 95%

Picosecond time-resolved x-ray refectivity of a laser-heated amorphous carbon film

et al. 2011

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Thermal expansion dependence on the sp2 concentration of amorphous carbon and carbon nitride

Cited by 12 publications

References 20 publications

Comparison of graphene oxide and graphitic carbon nitride filled carbon–phenolic composites: Thermomechanical properties and role of the strong electronegativity of nanofillers

Comparison of graphene oxide and graphitic carbon nitride filled carbon–phenolic composites: Thermomechanical properties and role of the strong electronegativity of nanofillers

Influence of krypton atoms on the structure of hydrogenated amorphous carbon deposited by plasma enhanced chemical vapor deposition

Picosecond time-resolved x-ray refectivity of a laser-heated amorphous carbon film

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