Excellent heat dissipation properties of the super-aligned carbon nanotube films

Zhang, Guang; Jiang, Shaohui; Zhang, Hui; Yao, Wei; Liu, Changhong

doi:10.1039/c6ra07143k

Cited by 42 publications

(68 citation statements)

References 39 publications

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“…Furthermore, continuous SACNT films can be directly pulled from the SACNT arrays (Figure 1d). 30,32,37 Acetylene was used as precursor, and the SACNT arrays were grown on silicon wafers at the temperatures of 650−700 °C. The growth time was in the range of 5−20 min, and the array height was altered from 100 to 900 μm.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

“…The growth time was in the range of 5−20 min, and the array height was altered from 100 to 900 μm. 30,37 Most of the CNTs are multiwalled CNTs, and their diameters range from 10 to 20 nm. There are strong van der Waals forces between neighboring single CNTs in the SACNT arrays.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

“…In our previous work, we have shown that the natural heat dissipation properties of bare copper (Cu) plates were enhanced ∼13% by coating multilayer SACNT films. 37 In this paper, a kind of patterned structure of SACNT films and underlying microchannels was designed, and the passive cooling properties were studied. The novel cooling devices based on SACNT films and underlying microchannels have much more effective cooling performances than bare Cu plates (which is widely used as raw materials to fabricate traditional heat dissipation devices).…”

Section: ■ Introductionmentioning

confidence: 99%

“…Meanwhile, the surface emissivity of every sample was measured by a thermal property testing device. 37 Then the radiation and natural convection heat transfer properties were respectively calculated. The calculations indicated that the excellent cooling properties of the CNT-based devices are primarily caused by the reinforcement of the natural convection heat transfer properties.…”

Section: ■ Introductionmentioning

confidence: 99%

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Enhancement of Natural Convection by Carbon Nanotube Films Covered Microchannel-Surface for Passive Electronic Cooling Devices

Guang

Jiang

Yao

et al. 2016

ACS Appl. Mater. Interfaces

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Owing to the outstanding properties of thermal conduction, lightweight, and chemical durability, carbon nanotubes (CNTs) have revealed promising applications in thermal management materials. Meanwhile, the increasingly popular portable electronics and the rapid development of space technology need lighter weight, smaller size, and more effective thermal management devices. Here, a novel kind of heat dissipation devices based on the superaligned CNT films and underlying microchannels is proposed, and the heat dissipation properties are measured at the natural condition. Distinctive from previous studies, by combining the advantages of microchannels and CNTs, such a novel heat dissipation device enables superior natural convection heat transfer properties. Our findings prove that the novel CNT-based devices could show an 86.6% larger total natural heat dissipation properties than bare copper plate. Further calculations of the radiation and natural convection heat transfer properties demonstrate that the excellent passive cooling properties of these CNT-based devices are primarily caused by the reinforcement of the natural convection heat transfer properties. Furthermore, the heat dissipation mechanisms are briefly discussed, and we propose that the very high heat transfer coefficients and the porous structures of superaligned CNT films play critical roles in reinforcing the natural convection. The novel CNT-based heat dissipation devices also have advantages of energy-saving, free-noise, and without additional accessories. So we believe that the CNT-based heat dissipation devices would replace the traditional metal-finned heat dissipation devices and have promising applications in electronic devices, such as photovoltaic devices, portable electronic devices, and electronic displays.

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Section: ■ Experimental Sectionmentioning

confidence: 99%

Section: ■ Experimental Sectionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Enhancement of Natural Convection by Carbon Nanotube Films Covered Microchannel-Surface for Passive Electronic Cooling Devices

Guang

Jiang

Yao

et al. 2016

ACS Appl. Mater. Interfaces

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“…The specific capacity of ACNT arrays was 350 mAh g −1 after 50 cycles in Li-battery, while the battery with the TCNTs achieved 197 mAh g −1 only [30]. The cooling efficiency of multilayer ACNT films could be about 13.3% higher than pure copper [31]. The heat dissipation efficiency of the flexible aluminum-ACNTs composites was higher than that of aluminum foil, copper sheet, and graphite sheet by up to 56%, 40%, and 20%, respectively [32].…”

Section: Introductionmentioning

confidence: 96%

Enhancement of electrical and thermal properties of graphene by aligned carbon nanotubes

Guo

et al. 2020

Mater. Res. Express

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In order to explore the composite effects of graphene (GR) and carbon nanotubes (CNTs), GR/CNTs aerogels and GR/CNTs coatings were fabricated. Aligned carbon nanotubes (ACNTs) and twining carbon nanotubes (TCNTs) were comparatively examined by integrating them with graphene, which has seldom been studied in detail. Freeze drying was novelly adopted to retain the liquid distribution in GR/CNTs mixture. Fourier Transform Infrared Spectroscopy (FTIR) analysis demonstrated that OH group and carboxylic acid groups were effectively induced onto CNTs via chemical modification. Scanning electron microscopy (SEM) showed that ACNTs achieved better dispersion and homogeneity in graphene than TCNTs. GR/CNTs hybrid composite with various loading of ACNTs or TCNTs were examined by electrical/thermal conductivity tests and practically evaluated for thermal management in LEDs. Results revealed that the electrical and thermal properties of graphene can be dramatically enhanced by the proper addition of ACNTs due to the formation of effective conductive bridges. The GR/ACNTs aerogel with 10 wt% ACNTs attained a high electrical conductivity of 2.08×10 4 S m −1 , elevated to 2.76×10 4 S m −1 after annealing treatment. The ecofriendly and low-cost GR/ACNTs coating with 10 wt% ACNTs prominently reduced the operating temperature of LEDs by 8.6°C, acting as potential thermal management materials in practical applications.

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High Water‐Absorbent and Phase‐Change Heat Dissipation Materials Based on Super‐Aligned Cross‐Stack CNT Films

Liu

Fan

2019

Adv Eng Mater

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Carbon nanotubes (CNTs) with the advantage of high thermal conductivity and light weight can be widely used in thermal management. Meanwhile, heat removal for hot spots has become a major issue in the development of electronics because of the increasing of power density and thermal load. Therefore, more effective heat dissipation approaches are needed. Here, the high water‐absorbent and phase‐change heat dissipation materials based on super‐aligned cross‐stack CNT (CSCNT) films with excellent cooling performance are reported. Pure CSCNT and CaCl2/CSCNT composite show the outstanding water absorption property because of their high specific surface area and porosity. Combined the high natural convection and heat radiation of CSCNTs with heat removal by water evaporation, the heat dissipation coefficient of CaCl2/CSCNT can reach as high as 98 W m−2 K−1 with the help of auxiliary plate. Due to the high absorption rate, the composite can absorb water when electronics are at low power and dissipate heat by water evaporation at high power. Moreover, it is founded that there is a dynamic balance of water absorption and desorption to enhance cooling performance at thermal equilibrium.

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Excellent heat dissipation properties of the super-aligned carbon nanotube films

Abstract: Excellent heat dissipation properties of multilayer super-aligned carbon nanotube films were measured and a novel CNT CPU-radiator was proposed.

Cited by 42 publications

References 39 publications

Enhancement of Natural Convection by Carbon Nanotube Films Covered Microchannel-Surface for Passive Electronic Cooling Devices

Enhancement of Natural Convection by Carbon Nanotube Films Covered Microchannel-Surface for Passive Electronic Cooling Devices

Enhancement of electrical and thermal properties of graphene by aligned carbon nanotubes

High Water‐Absorbent and Phase‐Change Heat Dissipation Materials Based on Super‐Aligned Cross‐Stack CNT Films

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