Silver-Nanoparticle-Embedded Hybrid Nanopaper with Significant Thermal Conductivity Enhancement

Abstract

Nanopapers derived from nanofibrillated cellulose (NFC) are urgently required as attractive substrates for thermal management applications of electronic devices because of their lightweight, easy cutting, cost efficiency, and sustainability. In this paper, we provided a facile fabrication strategy to construct hybrid nanopapers composed of dialdehyde nanofibrillated cellulose (DANFC) and silver nanoparticles (AgNPs), which exhibited a favorable thermal conductivity property. AgNPs were in situ proceeded on the surface of DANFC by the silver mirror reaction inspired by the aldehyde groups. Owing to the intermolecular hydrogen bonds inside the hybrid nanopapers, the DANFC enables the uniform dispersion of AgNPs as well as promotes the formation of the hierarchical structure. It was found that the AgNPs-coated DANFC (DANFC/Ag) hybrid nanopapers could easily form an effective thermally conductive pathway for phonon transfer. As a result, the thermal conductivity (TC) of the obtained DANFC/Ag hybrid nanopapers containing only 1.9 vol % of Ag was 5.35 times higher than that of the pure NFC nanopapers along with a significantly TC enhancement per vol % Ag of 230.0%, which was supposed to benefit from the continuous heat transfer pathway constructed by the connection of AgNPs decorated on the cellulose nanofibers. The DANFC/Ag hybrid nanopapers possess potential applications as thermal management materials in the next-generation portable electronic devices.

High-Performance and Rapid-Response Electrical Heaters Derived from Cellulose Nanofiber/Silver Nanowire Nanopapers for Portable Thermal Management

“…Herein, uniform and stable NFC dispersions with a length of 1∼4 μm and a diameter of 10∼60 nm prepared by continuous multiple cycles of mechanical treatment followed by high-pressure homogenization were assembled into a strong substrate (Figures 2a,b and S1). 54 The oxygen-containing groups on NFC allow it to readily integrate with other matrixes. Moreover, the NFC possesses excellent flexibility and heat resistance, especially for skin-friendly merit, which makes the NAPs significantly suitable for skin-contactable wearable devices.…”

“…Cellulose nanofibers (CNFs)/nanofibrillated cellulose (NFC), derived from cellulose are often used as a promising flexible substrate and reinforcement filler for nanocomposites due to their flexibility, hydrophilicity, and excellent mechanical strength. In recent years, CNFs/NFC have been integrated with conductive nanomaterials for extensive applications such as electromagnetic interference shielding, − sensors, , thermal management, , and so on. Our group also developed a flexible, ultralight, and conductive AgNW/NFC aerogel with high electrical conductivity (222.50 S/m) and excellent sensitivity (3.86 kPa –1 ), which was endowed with competent electrical properties and reliable mechanical integrity after thermal welding .…”

Electrically Conductive PVDF Ultrafiltration Membrane with In Situ Formation of a Ag NP Coating Layer for Perm-Selectivity Enhancement and Fouling Mitigation

“…The shifts were attributed to the difference in electronegativities and the strong interaction (e.g., interfacial interaction, electron transfer) between metal nanocrystals and the polymer substrates. This is mainly ascribed to the phenolic hydroxyl of TA acting as the nucleation site for Ag NPs to be stably anchored onto the polymer membrane. , …”

“…This is mainly ascribed to the phenolic hydroxyl of TA acting as the nucleation site for Ag NPs to be stably anchored onto the polymer membrane. 30,35 EIS measurements were performed to elucidate the impedance of PVDF/TA and PVDF/TA-Ag membranes. The electrochemical reactions were also analyzed using the membrane as the cathode and 1 g/L Na 2 SO 4 solution as a background electrolyte.…”

Eco-Friendly Silver Nanoparticles/Chitosan/Poly(vinyl alcohol) Composites Exhibit Remarkable EMI Shielding Capabilities and Outstanding Thermal Conductivities

“…23 Due to their exceptional thermal, electrical, and mechanical flexibility, Ag NPs can be perceived as one of the most promising options for the development of innovative polymer matrix composites. 24,25 The thermal conductivity of nanocomposites increased by 5 times compared to that of NFC or PPS (1.2 W•m −1 •K −1 ) when Li 26 and Zhao When the Ag NPs are combined with BN nanosheets, GNs, or CNF, the thermal or electrical conductivity of the nanocomposite become better than composites where BN nanosheets, GNs, or CNF fillers are incorporated alone. 28 There is a reason to believe that Ag NPs serve as exceptional fillers, significantly enhancing both the thermal conductivity (TC) and EMI shielding efficiency of composites.…”