Electrospraying Graphene Nanosheets on Polyvinyl Alcohol Nanofibers for Efficient Thermal Management Materials

Abstract

With the rapid development of electronic devices, the demand for heat-dissipating materials is increasing. Graphene is a two-dimensional (2D) material with high thermal conductivity. In this study, reduced graphene oxide (rGO) nanosheets are electrostatically sprayed on the surface of electrospun polyvinyl alcohol (PVA) nanofibers. A multilayer rGO/PVA film is fabricated by performing multi-step electrospinning and electrospraying. Finally, the multilayer rGO/PVA films are cut into small pieces and stacked for hot pressing to obtain a flexible H-rGO/ PVA-t film (where t denotes the rGO-layer electrospraying time). Scanning electron microscopy images show that an rGO-layer electrospraying time of 4 h resulted in a uniform distribution of rGO sheets on the PVA nanofiber surface to form continuous heat transfer channels. Hence, the H-rGO/PVA-4 composite exhibits high in-plane and cross-plane thermal conductivities of 6.15 and 0.89 W m −1 K −1 , respectively, and can be used as a thermal-interface material (TIM) to facilitate effective thermal management. Compared to a hot-pressed pure PVA film, the H-rGO/PVA-4 TIM facilitates a lower surface temperature for light-emitting diode (LED) lamps. This study provides a universal approach for fabricating heat-dissipating composites of 2D materials and polymer films.

Flexible Fluorinated Graphene/Poly(vinyl Alcohol) Films toward High Thermal Management Capability

“…Optical photographs of the F-FG-400/PVA film in the inset further demonstrate its excellent flexibility, making it suitable for use in flexible devices. Figure f and Table show that N-FG-400/PVA and F-FG-400/PVA had superior thermal management capability and excellent mechanical properties compared to other recent polymer-based composites, including rGO/PVA, graphene nanoplatelets/polydimethylsiloxane/fluorinated graphene (GnP@PDMS/GF), MXene@Ag/PVA, PVA/fluorographene nanosheets (FGN), PVA/rGO, epoxy/fluorinated graphene aerogel (FGA), and FGA/PDMS Figure S5 summarizes the effect of F-doping on the electric conductivity of the composite films, as determined by volume resistivity testing.…”

“…GO was obtained by a modified Hummers’ method with natural graphite, as described in our previous work . FG was prepared by calcining GO and PVDF under Ar as follows.…”

“…GO was obtained by a modified Hummers' method with natural graphite, as described in our previous work. 29 FG was prepared by calcining GO and PVDF under Ar as follows. GO and PVDF (mass ratio of 1:10) were separated by a copper mesh in a crucible with GO on the top and PVDF on the bottom.…”

State-of-the-art of electrospun nanocomposite nanofibers and membranes with carbon nanoparticles—Prevailing progressions

“…Another important matrix for electrospun nanofiber is poly(vinyl alcohol) with graphene additive [75,76] . The electrical conductivity, optical, and thermal stability features of the poly(vinyl alcohol) nanofibers have been found to enhance with graphene loadings [77] .…”

Nanofiber-Supported Palladium Nanocubes─Toward Highly Active and Reusable Catalyst

“…An alternative approach is to modify obtained nanofibers with nanoparticles (applied from suspension); ,− however, also in this case, the control of distribution of metal nanoparticles within the mat is limited. Clearly, to have control on the geometry of structures included in the mat as well as to ensure uniform distribution within the nanofiber bulk, using polymer suspension with ready structures is the safer option.…”