Carbon nanotube covalent bonding mediates extraordinary electron and phonon transports in soft epoxy matrix interface materials

Lee, Sanghoon; Suh, Daewoo; Kim, Wonjoon; Xu, Chenchen; Kim, Tae-Hun; Song, Changsik; Yoo, Chijong; Kim, Young-Sung; Kim, Joongnyon; Baik, Seunghyun

doi:10.1016/j.carbon.2019.10.013

Cited by 39 publications

(54 citation statements)

References 45 publications

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“…2 b further demonstrate the graphitization degree of all shaddock peel-based aerogel products. The prominent peaks at 1350 and 1580 cm −1 correspond to D-band and G-band, which are related to disordered carbon and sp 2 -bonded carbon, respectively [ 28 ]. As for all products, the I D / I G values (intensity ratio of D-band to G-band) are 1.01, 1.00, and 1.01, indicating the same high graphitization degree [ 29 ].…”

Section: Resultsmentioning

confidence: 99%

Environmentally Friendly and Multifunctional Shaddock Peel-Based Carbon Aerogel for Thermal-Insulation and Microwave Absorption

Sheng²,

et al. 2021

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Highlights The eco-friendly shaddock peel-derived carbon aerogels were prepared by a freeze-drying method. Multiple functions such as thermal insulation, compression resistance and microwave absorption can be integrated into one material-carbon aerogel. Novel computer simulation technology strategy was selected to simulate significant radar cross-sectional reduction values under real far field condition. . Abstract Eco-friendly electromagnetic wave absorbing materials with excellent thermal infrared stealth property, heat-insulating ability and compression resistance are highly attractive in practical applications. Meeting the aforesaid requirements simultaneously is a formidable challenge. Herein, ultra-light carbon aerogels were fabricated via fresh shaddock peel by facile freeze-drying method and calcination process, forming porous network architecture. With the heating platform temperature of 70 °C, the upper surface temperatures of the as-prepared carbon aerogel present a slow upward trend. The color of the sample surface in thermal infrared images is similar to that of the surroundings. With the maximum compressive stress of 2.435 kPa, the carbon aerogels can provide favorable endurance. The shaddock peel-based carbon aerogels possess the minimum reflection loss value (RLmin) of − 29.50 dB in X band. Meanwhile, the effective absorption bandwidth covers 5.80 GHz at a relatively thin thickness of only 1.7 mm. With the detection theta of 0°, the maximum radar cross-sectional (RCS) reduction values of 16.28 dB m2 can be achieved. Theoretical simulations of RCS have aroused extensive interest owing to their ingenious design and time-saving feature. This work paves the way for preparing multi-functional microwave absorbers derived from biomass raw materials under the guidance of RCS simulations.

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Section: Resultsmentioning

confidence: 99%

Environmentally Friendly and Multifunctional Shaddock Peel-Based Carbon Aerogel for Thermal-Insulation and Microwave Absorption

Sheng²,

et al. 2021

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“…This is removable which is advantageous for future disassembly and reassembly of the heat sink.The TIM can be classified based on directionality. [10] An anisotropic TIM, such as a graphite sheet, provides a high thermal conductivity (κ) in the aligned direction (≈1500 W m −1 K −1 ), but the κ in the perpendicular direction is significantly lower (≈5 W m −1 K −1 ). [11] Directional heat manipulation has been actively investigated using aligned hexagonal boron nitride platelets, [12] thermal metamaterials, [13,14] and aperiodic superlattice structures.…”

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confidence: 99%

“…An isotropic TIM provides a uniform κ in all directions and can be synthesized by dispersing randomly-oriented thermally conductive fillers in a polymer matrix. [10,17,18] The κ of commercial isotropic TIMs is typically small (≈10 W m −1 K −1 ). Various types of fillers, such as carbon nanotubes, graphene, boron nitrides, metal nanoparticles (NPs), and ceramic particles, have been actively investigated to enhance κ.…”

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confidence: 99%

“…Various types of fillers, such as carbon nanotubes, graphene, boron nitrides, metal nanoparticles (NPs), and ceramic particles, have been actively investigated to enhance κ. [10,17,[19][20][21][22] Polyurethane, epoxy (EP), and silicone rubber have been employed as a matrix to achieve high compressibility and conformability. [10,17,19,23] In this study, pad-type isotropic polymeric TIMs are primarily analyzed.Another important parameter of TIMs, in addition to κ, is thermal resistance.…”

mentioning

confidence: 99%

“…[10,17,[19][20][21][22] Polyurethane, epoxy (EP), and silicone rubber have been employed as a matrix to achieve high compressibility and conformability. [10,17,19,23] In this study, pad-type isotropic polymeric TIMs are primarily analyzed.Another important parameter of TIMs, in addition to κ, is thermal resistance. [24] The total thermal resistance (R t ) is composed of the specimen thermal resistance (R s = l/κ, l = specimen thickness) and R c .…”

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High‐Temperature Skin Softening Materials Overcoming the Trade‐Off between Thermal Conductivity and Thermal Contact Resistance

Kim

et al. 2021

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heat-dissipation structures, such as fins and micro/nanochannels, have been designed to efficiently dissipate heat from heat sources. [4][5][6] However, the inevitable gap between the heat source and heat exchanger results in thermal contact resistance (R c ), deteriorating heat dissipation performance. [7,8] The R c can be decreased by filling the gap with a thermal interface material (TIM). [1,7] A variety of different TIMs are available including thermal greases, adhesives, solders, and pads. [9] The pad-type TIM is a pre-formed thermally conductive film which can be compressed between the heat source and heat sink. This is removable which is advantageous for future disassembly and reassembly of the heat sink.The TIM can be classified based on directionality. [10] An anisotropic TIM, such as a graphite sheet, provides a high thermal conductivity (κ) in the aligned direction (≈1500 W m −1 K −1 ), but the κ in the perpendicular direction is significantly lower (≈5 W m −1 K −1 ). [11] Directional heat manipulation has been actively investigated using aligned hexagonal boron nitride platelets, [12] thermal metamaterials, [13,14] and aperiodic superlattice structures. [15,16] These technologies have potential applications in anisotropic TIMs. An isotropic TIM provides a uniform κ in all directions and can be synthesized by dispersing randomly-oriented thermally conductive fillers in a polymer matrix. [10,17,18] The κ of commercial isotropic TIMs is typically small (≈10 W m −1 K −1 ). Various types of fillers, such as carbon nanotubes, graphene, boron nitrides, metal nanoparticles (NPs), and ceramic particles, have been actively investigated to enhance κ. [10,17,[19][20][21][22] Polyurethane, epoxy (EP), and silicone rubber have been employed as a matrix to achieve high compressibility and conformability. [10,17,19,23] In this study, pad-type isotropic polymeric TIMs are primarily analyzed.Another important parameter of TIMs, in addition to κ, is thermal resistance. [24] The total thermal resistance (R t ) is composed of the specimen thermal resistance (R s = l/κ, l = specimen thickness) and R c . In order to decrease R s , the κ of TIMs can be increased by increasing filler concentration. However, the high filler concentration also increases elastic modulus (E), or decreases softness, making the conformal contact with a matingThe ORCID identification number(s) for the author(s) of this article can be found under

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In Situ Regeneration of Oxidized Copper Flakes Forming Nanosatellite Particles for Non‐Oxidized Highly Conductive Copper Nanocomposites

Faseela,

Ajmal,

Cha

et al. 2023

Adv Funct Materials

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Copper (Cu) is an attractive low‐cost alternative to silver or gold. However, it is susceptible to oxidation in air. Here, facile in situ regeneration of oxidized Cu flakes (CuFLs) for the synthesis of highly conductive non‐oxidized nanocomposites is reported. The oxidized CuFLs are regenerated into non‐oxidized CuFLs and Cu nanosatellite (CuNS) particles by formic acid‐aided in situ etching and reduction reaction in soft epoxy matrix. The average particle size of CuNS particles is only 3.3 nm with an interparticle distance of 2.7 nm. Furthermore, the negligible potential barrier height between Cu and epoxy dramatically increases the electrical conductivity (66 893 S cm−1) of the nanocomposite (Cu = 46 vol%) by more than three orders of magnitude. The thermal conductivity is also highest (85.1 W m−1 K−1), compared with Cu‐based nanocomposites in literature. The conductivities are invariant in air for more than 95 days. The simple scalable in situ regeneration of oxidized CuFLs may find immediate industrial applications.

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Carbon nanotube covalent bonding mediates extraordinary electron and phonon transports in soft epoxy matrix interface materials

Cited by 39 publications

References 45 publications

Environmentally Friendly and Multifunctional Shaddock Peel-Based Carbon Aerogel for Thermal-Insulation and Microwave Absorption

Environmentally Friendly and Multifunctional Shaddock Peel-Based Carbon Aerogel for Thermal-Insulation and Microwave Absorption

High‐Temperature Skin Softening Materials Overcoming the Trade‐Off between Thermal Conductivity and Thermal Contact Resistance

In Situ Regeneration of Oxidized Copper Flakes Forming Nanosatellite Particles for Non‐Oxidized Highly Conductive Copper Nanocomposites

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