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Updated: Dec 12, 2025

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Hexagonal Boron Nitride-Enhanced Optically Transparent Polymer Dielectric Inks for Printable Electronics.

Xiaoxi Zhu1, Leonard W T Ng1, Guohua Hu1,2

  • 1Cambridge Graphene Centre University of Cambridge Cambridge CB3 0FA UK.

Advanced Functional Materials
|August 11, 2020
PubMed
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Researchers developed a new polyurethane (PU) and hexagonal boron nitride (h-BN) composite ink for printed electronics. This formulation enhances dielectric properties and optical transparency in flexible thin-film dielectrics.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Electronics Engineering

Background:

  • Solution-processable thin-film dielectrics are crucial for large-area printed electronics but often limited by low dielectric constants in pure polymers.
  • Existing alternatives like solution-processed 2D hexagonal boron nitride (h-BN) face challenges with film porosity, mechanical integrity, and moisture resistance.

Purpose of the Study:

  • To develop a novel, solution-processable composite dielectric material that overcomes the limitations of current thin-film dielectrics.
  • To enhance the dielectric constant and maintain optical transparency and mechanical flexibility for printed electronics applications.

Main Methods:

  • A "one-pot" formulation combining polyurethane (PU) with hexagonal boron nitride (h-BN) nano-fillers was developed.
  • Optimization of h-BN dispersion concentration to improve exfoliation yield, optical transparency, and thin-film uniformity.
Keywords:
2D materialsK‐bar coatingsdielectricsfunctional inkshexagonal boron nitrideprinted electronics

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  • Characterization of the resulting PU+h-BN thin-films for dielectric properties, optical transparency, and mechanical flexibility.

    • Main Results:

    • Pinhole-free, flexible PU+h-BN dielectric thin-films were successfully coated.
    • A dielectric constant (ε) of ≈7.57 was achieved, a two-fold increase over pure PU, using only 0.7 vol% h-BN.
    • High optical transparency (≈78.0%) and consistent dielectric properties (areal capacitance variation <8%) were demonstrated.

    Conclusions:

    • The developed PU+h-BN composite ink offers a promising solution for advanced printed electronics.
    • This formulation provides an optically transparent, flexible thin-film dielectric with an enhanced dielectric constant.
    • The material is suitable for large-area, fully-printed electronic applications requiring high performance and reliability.