title: Thermally Conductive, Electrical Insulating, Optically Transparent Bi-Layer Nanopaper.
abstract: Cellulose nanofiber (CNF) from abundant and renewable wood is an emerging material with excellent mechanical, chemical, and optical properties. Transparent nanopaper made of CNF (CNF-nanopaper) could potentially replace plastics in electronics due to its excellent optical transparency, mechanical strength, and biodegradability. However, CNF-nanopaper normally has a low thermal conductivity and poor stability in increasing temperatures, which is not suitable for long-term stability and reliability in devices. Herein, for the first time, we report a thermally conductive, electrically insulating, and optically transparent nanopaper using a bilayer design where a thin layer of boron nitride (BN) nanosheets were coated on the CNF-nanopaper. An optical transparency (70%) and a thermal conductivity (0.76 W/m/K) were successfully achieved through a solution-based process at room temperature. Such an optically transparent, electrically insulating, and thermally conductive bilayer nanopaper can find applications in a range of electronic devices.
authors.affiliation: School of Chemistry and Molecular Engineering, East China University of Science and Technology , Shanghai 200237, China.|Department of Materials Science and Engineering, University of Maryland , College Park, Maryland 20742, United States.
authors.forename: Lihui
authors.initials: L
authors.lastname: Zhou
authors.affiliation: Department of Mechanical Engineering, University of Maryland , College Park, Maryland 20742, United States.
authors.forename: Zhi
authors.initials: Z
authors.lastname: Yang
authors.affiliation: Department of Materials Science and Engineering, University of Maryland , College Park, Maryland 20742, United States.|Department of Mechanical Engineering, University of Maryland , College Park, Maryland 20742, United States.
authors.forename: Wei
authors.initials: W
authors.lastname: Luo
authors.affiliation: Department of Materials Science and Engineering, University of Maryland , College Park, Maryland 20742, United States.
authors.forename: Xiaogang
authors.initials: X
authors.lastname: Han
authors.affiliation: Department of Materials Science and Engineering, University of Maryland , College Park, Maryland 20742, United States.
authors.forename: Soo-Hwan
authors.initials: SH
authors.lastname: Jang
authors.affiliation: Department of Materials Science and Engineering, University of Maryland , College Park, Maryland 20742, United States.
authors.forename: Jiaqi
authors.initials: J
authors.lastname: Dai
authors.affiliation: Department of Mechanical Engineering, University of Maryland , College Park, Maryland 20742, United States.
authors.forename: Bao
authors.initials: B
authors.lastname: Yang
authors.affiliation: Department of Materials Science and Engineering, University of Maryland , College Park, Maryland 20742, United States.
authors.forename: Liangbing
authors.initials: L
authors.lastname: Hu
keywords: bilayer design; cellulose nanopaper; electronically insulating; optically transparent; solvent exfoliation; thermally conductive