Parametric study of intrinsic thermal transport in vertically aligned multi-walled carbon nanotubes using a laser flash technique

Lin, Wei; Shang, Jintang; Gu, Weixing; Wong, Ching‐Ping

doi:10.1016/j.carbon.2011.11.038

Cited by 64 publications

(42 citation statements)

References 77 publications

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“…According to Ref. [26], there are five criteria need to be fit when adopting the LFA method to test the thermal conductivity: (1) heat flow is one-dimensional; (2) pulse width of the incident laser is negligible compared with the characteristic transit duration of the heat flux through the test sample so that the laser incidence and energy absorption is instantaneous; (3) penetration depth of the incident laser is very small; (4) material properties are temperature independent, or at least, not strongly temperature dependent; and (5) heat losses from the sample surfaces are negligible.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on Carbon Nanotubes as Thermal Interface Material Bonded With Liquid Metal Alloy

Chang

et al. 2015

Journal of Heat Transfer

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Vertically aligned carbon nanotube (VACNT) films with high thermal conductance and mechanical compliance offer an attractive combination of properties for thermal interface applications. In current work, VACNT films synthesized by the chemical vapor deposition method were used as thermal interface material (TIM) and investigated experimentally. The liquid metal alloy (LMA) with melting point of 59 C was used as bonding material to attach VACNT films onto copper plates. In order to enhance the contact area of LMA with the contact surface, the wettability of the contact surface was modified by plasma treatment. The thermal diffusivity, thermal conductivity, and thermal resistance of the synthesized samples were measured and calculated by the laser flash analysis (LFA) method. Results showed that: (1) VACNT films can be used as TIM to enhance the heat transfer performance of the contact surface; (2) the LMA can be used as bonding material, and its performance is dependent on the LMA wettability on the contact surface. (3) When applying VACNT film as the TIM, LMA is used as the bonding material. After plasma treatment, comparison of VACNT films with the dry contact between copper and silicon showed that thermal diffusivity can be increased by about 160%, the thermal conductivity can be increased by about 100%, and the thermal resistance can be decreased by about 31%. This study shows the advantages of using VACNT films as TIMs in microelectronic packaging.

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Section: Introductionmentioning

confidence: 99%

“…The temperature on the rear surface of the sample is monitored by the infrared detector. Thermal diffusivity (a) of the sample is obtained by a parametric fitting of the recorded temperature versus time history of the rear face of the sample after the laser is shone on the front face [26,27]. According to Ref.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Carbon Nanotubes as Thermal Interface Material Bonded With Liquid Metal Alloy

Chang

et al. 2015

Journal of Heat Transfer

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“…The packing density (i.e., volume filling fraction) f of the CNT in the film was estimated to be 5%. 17 Figure 1(a) shows the regular spectral transmittance of the VACNT samples along with that of the reference substrate, which includes the oxide films and catalyst layers, measured with a Fourier-transform infrared (FTIR) spectrometer at room temperature. While the spectrometer was purged with N 2 gas, residual absorption by CO 2 (near 4.3 and 15 lm) and water vapor (2.5-2.8 lm and 5-7 lm) could show up in the measured spectra.…”

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confidence: 99%

Infrared absorption coefficients of vertically aligned carbon nanotube films

Wang

Lin

et al. 2012

Applied Physics Letters

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Vertically aligned carbon nanotube (VACNT) films have promising applications in solar cells, radiometers, and photonic devices. We have fabricated VACNT films with thicknesses of 10, 36, 45, and 120 μm on silicon substrates. The absorption coefficient of each film is obtained from the measured regular transmittance from 1 to 19 μm wavelengths, using a ratio method. The degree of alignment of the VACNT films is estimated by comparison of experiments with an analysis based on the effective medium theory. The effect of thickness on the absorption coefficient of the VACNT films is elucidated according to their morphologies.

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“…Some other researches focused on room temperature behavior, which showed obvious diversities as well. Measurements on individual CNT varied from 300 to 3294W/m · K, 11,12 while values of aligned CNT film varied from 27 to 200 W/m · K. [13][14][15] Molecular dynamics and phonon analysis have been widely used in this field too, offering more systematic insights that yet cannot be achieved through experiments. However, modeling and theoretical methods were not able to produce consistent results either.…”

Section: Introductionmentioning

confidence: 99%

A practical dimensionless equation for the thermal conductivity of carbon nanotubes and CNT arrays

Chen

Huang

2014

AIP Advances

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Experimental results reported in the last decade on the thermal conductivity of carbon nanotubes (CNTs) have shown a fairly divergent behavior. An underlying intrinsic consistency was believed to exist in spite of the divergence in the thermal conductivity data of various CNTs. A dimenisonless equation that describes the temperature dependence of thermal conductivity was derived by introducing reduced forms relative to a chosen reference point. This equation can serve as a practical approximation to characterize the conductivity of individual CNT with different structural parameters as well as bulk CNT arrays with different bundle configurations. Comparison of predictions by the equation and historical measurements showed good agreements within their uncertainties.

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Parametric study of intrinsic thermal transport in vertically aligned multi-walled carbon nanotubes using a laser flash technique

Cited by 64 publications

References 77 publications

Investigation on Carbon Nanotubes as Thermal Interface Material Bonded With Liquid Metal Alloy

Investigation on Carbon Nanotubes as Thermal Interface Material Bonded With Liquid Metal Alloy

Infrared absorption coefficients of vertically aligned carbon nanotube films

A practical dimensionless equation for the thermal conductivity of carbon nanotubes and CNT arrays

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