Journal
ACS APPLIED NANO MATERIALS
Volume 3, Issue 8, Pages 7633-7642Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.0c01262
Keywords
dual functionalization; boron nitride allotropes; pyrene-tethered polymer; liquid phase exfoliation; thermal conductivity; dielectric constant
Funding
- Ministry of Trade, Industry and Energy (MOTIE, Korea) [10063274]
- Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT [2018M3D1A1058536]
- Korea Electrotechnology Research Institute (KERI) [20A01059]
- National Research Council of Science & Technology (NST), Republic of Korea [20A01059] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Owing to its favorable solution processability, the development of a stable dispersion of two-dimensional (2D) boron nitride (BN) has received significant attention for cutting-edge optic/electronic applications. Herein, we report an efficient method to disperse BN nanosheets (BNNSs) in polar solvents via dual noncovalent interactions using pyrene-tethered poly(4-vinylpyridine) (P4VP-Py). As a dispersion agent, P4VP-Py enables bifunctionalization with BNNS through pi-pi and Lewis acid-base interactions arising from the pyrene and pyridine moiety, respectively, resulting in highly stable BNNS dispersions in different polar solvents. The blend of P4VP-Py-functionalized BNNS with the pristine P4VP matrix resulted in increased thermal conductivity and dielectric constant combined with superior thermal stability by forming a compatible interface between the P4VP-Py matrix and the BNNS adjacent to the P4VP-Py. We demonstrated that dual noncovalent functionalization of BNNSs based on molecular design presents a strategy to achieve high dispersion of 2D materials into various media, ranging from polar solvents to solid matrices, for the expansion of advanced optic/electronic applications using BNNSs.
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