Optical pump-probe measurements of sound velocity and thermal conductivity of hydrogenated amorphous carbon films

Arlein, J. L.; Palaich, S.; Daly, Brian C.; Subramonium, Pramod; Antonelli, G. A.

doi:10.1063/1.2963366

Cited by 29 publications

(9 citation statements)

References 18 publications

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“…2a. Firstly, the simulations are in good qualitative agreement with the available experimental data [3][4][5][6][7][8][9][10], particularly given the magnitude of the experimental uncertainties. Secondly, the linear dependence on density is close to that measured experimentally by Shamsa et al, [4], with the gradients differing by just 20%.…”

supporting

confidence: 63%

“…Ref [3] Ref [4] Ref [5] Ref [6] Ref [7−8] Ref [8] Ref [9] Ref [10] diamonds in Fig. 2) exhibits no such variability, finding little deviation from a straight line fitted through the simulation data points.…”

mentioning

confidence: 99%

“…The triangles and circles in Fig. 2a illustrate the broad experimental spread, showing data from eight different authors using either the 3ω [3][4][5] or optical [6][7][8][9][10] methodology. Some of this variability is due to the specifics of sample preparation, prompting Shamsa et al [4] to perform a series of measurements on carbon films deposited in a systematic manner.…”

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confidence: 99%

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Effect of microstructure on the thermal conductivity of disordered carbon

Suarez-Martinez

Marks

2011

Applied Physics Letters

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Computational methods are used to control the degree of structural order in a variety of carbon materials containing primarily sp 2 bonding. Room-temperature thermal conductivities are computed using non-equilibrium molecular dynamics. Our results reproduce experimental data for amorphous and glassy carbons and confirm previously proposed structural models for vitreous carbons. An atomistic model is developed for highly oriented thin films seen experimentally, with a maximum computed thermal conductivity of 35 Wm −1 K −1 . This value is much higher than that of the amorphous and glassy structures, demonstrating that the microstructure influences the thermal conductivity more strongly than the density.

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confidence: 63%

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confidence: 99%

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confidence: 99%

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Effect of microstructure on the thermal conductivity of disordered carbon

Suarez-Martinez

Marks

2011

Applied Physics Letters

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“…Some previous studies have shown that the phonon velocity and specific heat of amorphous carbon (a-C) mainly depend on the content of C-C sp 2 and C-C sp 3 bonding [37][38][39]. Thus, we suppose the a-C layer in this work could have a phonon velocity and specific heat approximate to the crystalline graphite, since it is derived from the crystalline graphite that could have a high proportion of C-C sp 2 bonding and can be essentially regarded as the graphite in the short range.…”

Section: Thermal Conductivitymentioning

confidence: 99%

Improvement in Mechanical and Thermal Properties of Graphite Flake/Cu Composites by Introducing TiC Coating on Graphite Flake Surface

Zhang

Liu

et al. 2019

Metals

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In this work, TiC coating was successfully deposited on a graphite flake surface via molten salt technique, for the purpose of promoting the interfacial connection between Cu and graphite flake. Vacuum hot pressing was then employed to prepare TiC-coated graphite flake/Cu composite. The results indicate that introducing TiC coating on graphite flake surface can evidently reduce the pores and gaps at the interface, resulting in a significant improvement on the bending strength. When the TiC-coated graphite flake content is 60 vol%, the bending strength is increased by 58% compared with the uncoated one. The coefficient of thermal expansion dropped from 6.0 ppm·K−1 to 4.4 ppm·K−1, with the corresponding thermal conductivity as high as 571 W·m−1·K−1. The outstanding thermal conductivity, apposite coefficient of thermal expansion, as well as superior processability, make TiC-coated graphite flake/Cu composite a satisfactory electronic packaging material with vast prospect utilized in microelectronic industry.

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“…The lack of lattice periodicity and correlated behaviour at remote distances within the carbonaceous material reduce the mean free path of the energy carriers (both electrons and phonons), and degrade the efficiency of energy transmission. Together with graphene, its close relative-the quasi-one-dimensional carbon nanotube, is comparatively more conductive than the non-crystalline phases including amorphous carbon, [11][12][13][14][15][16][17][18] glassy carbon, 19,20 and pyrolytic char. 21 Consequently, this triggers the notion to explore ways to convert the disordered phases to their graphitic counterparts in order to improve the conductance of electric and thermal energy.…”

Section: Introductionmentioning

confidence: 99%

Graphitization of amorphous carbon and its transformation pathways

Loh¹,

Baillargeat²

2013

Journal of Applied Physics

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Articles you may be interested inHydrogen stability in hydrogenated amorphous carbon films with polymer-like and diamond-like structure J. Appl. Phys. 112, 093502 (2012); 10.1063/1.4764001Structures and phonon properties of nanoscale fractional graphitic structures in amorphous carbon determined by molecular simulationsThe graphitic ordering of the amorphous state of carbon has been a long-standing challenge. Whilst there are numerous transformation methodologies, including the high-temperature-pressure approach, there are still many unclear elements concerning the mechanism. By employing classical molecular dynamics simulations, the process of graphitization of amorphous carbon is modelled and analyzed. A systematic study of various schemes of loading conditions suggests that (1) axial strain is a vital ingredient in the transformation, and (2) there exists a close relationship between the mean layer atomic density of the amorphous carbon structure and the graphitization process. Furthermore, the non-simultaneity (i.e., in a delayed manner) of structure loading (by high-temperature annealing and straining) promotes a greater extent of graphitization, as compared to a concurrent means. More interestingly, edge and non-edge bonds behave dissimilarly in response to a change in the atomic density, and graphitization prevails at different stages of the fast and slow loading schemes. Virial pressure calculations validate the structural stability. V C 2013 AIP Publishing LLC.

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Optical pump-probe measurements of sound velocity and thermal conductivity of hydrogenated amorphous carbon films

Cited by 29 publications

References 18 publications

Effect of microstructure on the thermal conductivity of disordered carbon

Effect of microstructure on the thermal conductivity of disordered carbon

Improvement in Mechanical and Thermal Properties of Graphite Flake/Cu Composites by Introducing TiC Coating on Graphite Flake Surface

Graphitization of amorphous carbon and its transformation pathways

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