writer：Bingfei Nan, KunWu, Zhencai Qu, Luqi Xiao, Changan Xu, Jun Shi，Mangeng Lu
keywords：Nanodiamond，Poly(diallyldimethylammonium chloride)，Graphene oxide，Thermal conductivity
source：期刊
specific source：Carbon
Issue time：2020年

In this study, we developed a multifunctional thermal management nanocomposite paper (NPG) consisting of cationic poly (diallyldimethylammonium chloride) (PDDA)-functionalized graphene oxide (PG) and nanodiamond (ND). Due to the functionalized reduction of graphene oxide (GO) by PDDA as well as electrostatic interactions between the positively charged PG and negatively charged ND, a threedimensional (3D) hybrid NPG paper constructed by two-dimensional (2D) PG layers and zerodimensional (0D) ND particles was successfully prepared via a vacuum-assisted self-assembly strategy. The resulting NPG papers were characterized by various techniques including Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) pattern and X-ray photoelectron spectroscopy (XPS). In this

analogous 3D “panel-bead” structure, adjacent PG nanosheets and ND particles are bridged through electrostatic interactions, which strengthens the interface connection and reduces phonon scatterings, resulting in an effective phonon transport pathway. Thus, a superior in-plane thermal conductivity of 16.653W m-1K-1 was obtained at the mass ratio of GO:ND= 3:1 (NPG3), which is about 80 times higher than that of traditional pure polymers. In addition, the peak heat release rate (PHRR) of NPG3 paper was only 99.16 W g-1 at 439.2 ℃ while that of GO was 438.4 W g-1 at 210.9℃, indicating that NPG paper possesses excellent flame retardancy. More interestingly, although the NPG3 paper has excellent insulation (electrical resistivity reaches up to 2.647× 1011 U cm), the ultrafast flame alarm response was found within about 1s after the paper exposed to the flame. This design idea provides an alternative approach for preparing multifunctional thermal management nanocomposites in the future.