Fluorinated Carbon Nanotube/Nanofibrillated Cellulose Composite Film with Enhanced Toughness, Superior Thermal Conductivity, and Electrical Insulation

Abstract

Recently, graphene and carbon nanotubes (CNTs) promise considerable application potentials in the highly efficient thermal management of high-power devices because of their superb thermal conductivity (TC). However, the high electrical conductivity hampers their use in some fields where electrical insulating components are always required. Herein, to coordinate the thermal and electrical conductivity of CNT, fluorinated CNT (FCNT) was first used as a thermally conductive filler to prepare composite film with nanofibrillated celluloses (NFCs) via facile vacuum-assisted filtration. The obtained composite film shows a well-organized layered structure of the building blocks along the planar direction. Moreover, the one-dimensional structure of NFCs and the strong interaction of NFCs and FCNTs ensure sufficient connection between FCNT themselves and the reduced interfacial thermal resistance of NFCs/FCNTs, so that efficient heat transfer pathways can be well reserved, leading to simultaneous accessibility of high in-plane TC of 14.1 W m K and favorable electrical insulation property at an FCNT content of 35 wt %. Despite such a high FCNT loading, the strong interaction between NFCs and FCNTs enables the composite film to possess enhanced toughness, reliable mechanical strength, and flexibility. Therefore, we think that these outstanding comprehensive properties guarantee that the prepared composite film has promising applications in heat dissipation of next-generation portable and collapsible electronic devices.

Thermal Transport in 3D Nanostructures

“…To resolve this issue, different surface modifications have been proposed, such as fluorination, which could on the one hand achieve similar enhancement to κ compared with the pristine CNT while retaining a good electrical insulation characteristic of the composite. [172] Several earlier papers already contain a wealth of information on the thermal transport Adv. Funct.…”

Top-down strategy synthesis of fluorinated graphdiyne for lithium ion battery

“…[29][30][31] Fluorination is an effective method to improve the thermal and mechanical properties within carbon materials. [32][33][34] In order to investigate the mechanical changes of GDY and F doped GDY in the electrochemical process, an in situ quantitative nanomechanical (QNM) atomic force microscope was used to the measure the elastic modulus variations during the rst discharge/charge cycle. A commercial silicon nitride tip (RTESPA, cantilever resonance frequency of 200 kHz and nominal elastic constant of 40 N m À1 ) with a typical apex radius of 10 nm was used.…”

A brief review for fluorinated carbon: synthesis, properties and applications

“…Fluorinated carbon with such remarkable properties has been widely researched and applied in the field of self-cleaning, lubricants, super-hydrophobic coating and energy storage, et al Here, we give a simple comparison of the performances for fluorinated carbon and carbon materials applied in different fields in the Table 2. Compare to the properties of carbon and fluorinated carbon, CFx materials possess a lower friction coefficient than carbon, which demonstrates that the CFx materials have longer wear lives, lower friction coefficients and superior load-carrying capacities due [43] to the weakened interlamellar van der Waals forces. The surface tension and energy are calculated by the contact angle.…”

“…Although fluorinate carbon materials are applied and developed widely in the field of primary lithium ion batteriy, the unique materials also are utilized in other fields like biomedicines, gas sensors, electronics devices and microwave absorption devices [43,[100][101][102][103][104][105].…”

“…The tunable electronic structure in fluorinated carbon is sufficiently utilized in electronic devices. Wang et al firstly used fluorinated carbon nanotube (FCNT) as a thermally conductive filler to prepare composite film with nano fibrillated celluloses (NFCs) [43]. The presence of FCNT induces the excellent thermal conductivity, favorable electrical insulation property, enhanced toughness, reliable mechanical strength, and flexibility.…”