The enhanced thermal transport properties of a heat spreader assembled using non-covalent functionalized graphene

Ren, Li; Wang, Mengjie; Wei, Zhouqiao; Cheng, Jingzhen; Li, Kuo; Pan, Leilei; Lao, Li; Lu, Shaorong; Yu, Jinhong

doi:10.1039/d0nj00936a

Cited by 7 publications

(4 citation statements)

References 53 publications

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“…The intensity of this peak grew with increased GN content. Meanwhile, in the X‐ray diffraction (XRD) spectra (Figure 2b), the intensity of a new peak at 26.6°, [ 38 ] corresponding to the characteristic peak of graphene with an interlamellar spacing of 0.34 nm, increased with GNs content. Next, the thermal stability of the PVA films was investigated by thermogravimetric analysis (TGA) and derivative thermogravimetry (DTG).…”

Section: Resultsmentioning

confidence: 99%

Multifunctional Shape Memory Films for a Flexible Electrical Sensor

Yang

et al. 2021

Macro Materials & Eng

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Shape memory polymers exhibit great potential for applications in aeronautics, astronautics, biomedicine, intelligent robots, and electronics. Based on traditional fabrication methods, as‐prepared shape memory micro‐/nanodevices are brittle with poor deformability. For instance, these devices shatter or crack when they are bent, which greatly limit their practical applications. In particular, there has been little use of shape memory films for high performance sensing devices in electrical circuits. Here, a novel polyvinyl alcohol (PVA) film is fabricated from a mixture of graphene nanosheets (GNs), sisal cellulose microcrystals (CNC), polyamine‐functionalized perylene bisimide derivative (APBI), and PVA through a simple electrospinning technique. These novel PVA films exhibit excellent thermal, mechanical, and shape memory properties. Moreover, after spin‐coating with Ag nanowires, the PVA films show excellent conductivity and flexibility in shape memory recovery cycles, and are used as a flexible sensing device in the circuit.

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Section: Resultsmentioning

confidence: 99%

Multifunctional Shape Memory Films for a Flexible Electrical Sensor

Yang

et al. 2021

Macro Materials & Eng

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“…The crude product was added to 80 mL of potassium hydroxide solution with a mass fraction of 10% and stirred at room temperature for 5 h to remove unreacted PTCDA. Finally, the product PBI was obtained by washing with deionized water and ethanol until the solution became neutral and then dried in a vacuum at 60 °C for 12 h; the preparation process of PBI is shown in Figure S1.…”

Section: Methodsmentioning

confidence: 99%

“…On the basis of the above discussion, we combined π–π noncovalent bonds and the rotating coating method not only to promote the dispersion of GR in the WEP matrix but also to enhance the orientation in the horizontal direction to get coating with excellent corrosion resistance and wear resistance properties. For the π–π stack, perylene bisimide (PBI) derivatives has a very powerful conjugated system, the π–π stack action between the molecule with the orbital and the graphene electron cloud, which is adsorbed on the graphene nanocrystals to disperse graphene. − Meanwhile, because a nonconducting polymer can interrupt the conductive path of graphene to prevent electrochemical corrosion, good dispersion of graphene improves the barrier property and lubricity of the coating. Cui et al prepared poly(dopamine) by noncovalent bond dispersion of graphene oxide, with the impedance value of 1.16 × 10 8 .…”

Section: Introductionmentioning

confidence: 99%

Improving Corrosion Protection and Friction Resistance of Q235 Steel by Combining Noncovalent Action and Rotating Coating Method

Lao

Ren

et al. 2021

ACS Omega

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Developing waterborne epoxy (WEP) coatings with excellent corrosion resistance and tribological properties is a key aspect to solve the damage of Q235 steel. In this work, perylene bisimide (PBI) derivatives dispersion graphene (GR) were prepared by a π–π stacking, the highly orientated PBI0.5%/GR0.5%/WEP coating will be prepared by the rotating coating method. Especially, the impedance value reached about 109 Ω·cm2 when the PBI and GR ratio is 1:1. The impedance value of PBI0.5%/GR0.5%/WEP coating increased by 3 orders of magnitude compared with that of pure WEP coating (106 Ω·cm2). Additionally, the coefficient of friction of the coatings was 0.33; compared with that of WEP, the coefficient of friction decreased by 48%, and the wear resistance increased by 87.6%. The results show that the PBI0.5%/GR0.5%/WEP coatings exhibited excellent corrosion resistance and wear resistance properties due to the good dispersion and high orientation of PBI/GR in WEP. It is anticipated that our current work would guide the ongoing efforts to develop a more efficient method to overcome the poor dispersion of GR in waterborne epoxy resin and provide a green coating with excellent corrosion resistance and wear resistance properties.

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“…Thermal reduction of GO membranes at variable temperature demonstrated thermal conductivities to increase with annealing temperatures, yielding values up to 1000 Wm –1 K –1 for annealing above 1000 °C and even higher values for annealing above 2000 °C, when extensive graphitization of the film occurs. Preparation of conductive nanopapers from low-oxidized GRM was also explored and proven effective for thermal conductivity. − This latter route allows avoiding the harsh chemical processes for GO production and subsequent reduction of the film, but may lead to lower thermal conductivity (often in the range of 300 Wm –1 K –1 ) compared to high-temperature annealed GO papers, despite the high thermal conductivity of the individual low-defectiveness nanoplates. This is mainly related to the thermal resistance associated to weak contacts between conductive particles, explained by the weak interaction forces between nanoplates, as well as their limited flexibility and planarity.…”

Section: Introductionmentioning

confidence: 99%

Bispyrene Functionalization Drives Self-Assembly of Graphite Nanoplates into Highly Efficient Heat Spreader Foils

Ferraro

Bernal

Carniato

et al. 2021

ACS Appl. Mater. Interfaces

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Thermally conductive nanopapers fabricated from graphene and related materials are currently showing great potential in thermal management applications. However, thermal contacts between conductive plates represent the bottleneck for thermal conductivity of nanopapers prepared in the absence of a high temperature step for graphitization. In this work, the problem of ineffective thermal contacts is addressed by the use of bifunctional polyaromatic molecules designed to drive self-assembly of graphite nanoplates (GnP) and establish thermal bridges between them. To preserve the high conductivity associated to a defect-free sp 2 structure, non-covalent functionalization with bispyrene compounds, synthesized on purpose with variable tethering chain length, was exploited. Pyrene terminal groups granted for a strong π–π interaction with graphene surface, as demonstrated by UV–Vis, fluorescence, and Raman spectroscopies. Bispyrene molecular junctions between GnP were found to control GnP organization and orientation within the nanopaper, delivering significant enhancement in both in-plane and cross-plane thermal diffusivities. Finally, nanopapers were validated as heat spreader devices for electronic components, evidencing comparable or better thermal dissipation performance than conventional Cu foil, while delivering over 90% weight reduction.

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The enhanced thermal transport properties of a heat spreader assembled using non-covalent functionalized graphene

Abstract: A brick-and-mortar microstructure was constructed for good thermal transport in graphene paper.

Cited by 7 publications

References 53 publications

Multifunctional Shape Memory Films for a Flexible Electrical Sensor

Multifunctional Shape Memory Films for a Flexible Electrical Sensor

Improving Corrosion Protection and Friction Resistance of Q235 Steel by Combining Noncovalent Action and Rotating Coating Method

Bispyrene Functionalization Drives Self-Assembly of Graphite Nanoplates into Highly Efficient Heat Spreader Foils

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