Key Takeaways & Executive Findings
- •• The WPU nanocomposite film with 30 wt% FG@CuP@ZTC shows a 55.6% improvement in limiting oxygen index (LOI), 66.0% and 40.5% reductions in peak heat release rate and total heat release, respectively, and a 93.3% increase in tensile strength compared to pure WPU film. • The film achieves a high thermal conductivity of 12.7 W m−1 K−1 and a low dielectric constant of 2.92 at 106 Hz, addressing the need for efficient heat dissipation and low signal transmission loss in microelectronics. • The trinity strategy of in situ self-assembly immobilization of CuP and ZTC onto fluorinated graphene (FG) creates a synergistic heterostructure that simultaneously enhances flame retardancy, thermal conductivity, and mechanical strength. • This work provides a commercially viable, bionic layer-by-layer (LBL) design strategy for developing multifunctional polymer nanocomposite films suitable for high-power-density microelectronic thermal management.
Abstract
To adapt to the trend of increasing miniaturization and high integration of microelectronic equipments, there is a high demand for multifunctional thermally conductive (TC) polymeric films combining excellent flame retardancy and low dielectric constant (ε). To date, there have been few successes that achieve such a performance portfolio in polymer films due to their different and even mutually exclusive governing mechanisms. Herein, we propose a trinity strategy for creating a rationally engineered heterostructure nanoadditive (FG@CuP@ZTC) by in situ self-assembly immobilization of copper-phenyl phosphonate (CuP) and zinc-3, 5-diamino-1,2,4-triazole complex (ZTC) onto the fluorinated graphene (FG) surface. Benefiting from the synergistic effects of FG, CuP, and ZTC and the bionic lay-by-lay (LBL) strategy, the as-fabricated waterborne polyurethane (WPU) nanocomposite film with 30 wt% FG@CuP@ZTC exhibits a 55.6% improvement in limiting oxygen index (LOI), 66.0% and 40.5% reductions in peak heat release rate and total heat release, respectively, and 93.3% increase in tensile strength relative to pure WPU film due to the synergistic effects between FG, CuP, and ZTC. Moreover, the WPU nanocomposite film presents a high thermal conductivity (λ) of 12.7 W m−1 K−1 and a low ε of 2.92 at 106 Hz. This work provides a commercially viable rational design strategy to develop high-performance multifunctional polymer nanocomposite films, which hold great potential as advanced polymeric thermal dissipators for high-power-density microelectronics.
1. Introduction
With the mushroom development of fifth-generation (5G) wireless communication systems, internet of things, artificial intelligence, and integrated circuits, the heat dissipation problem has recently became a prominent challenge for the microelectronic devices with their continuous evolution toward high integration, large power, miniaturization, and densification [1–3]. The over-heating caused by heat accumulation will seriously affect the operating efficiency, reliability, and working life of these microelectronic devices and even cause fire [4, 5]. Additionally, the fast signal transmission of these microelectronic devices places higher dielectric property requirements on the substrate materials [6]. In this context, it is highly imperative to design multifunctional microelectronic materials with high thermal conductivity (λ), satisfactory fire retardancy, and low dielectric constant (ε) for safe and effective heat dissipation without compromising transmission loss [7–9].
Polymer-based thermally conductive (TC) nanocomposite films, as a key cooling material in microelectronic devices, possess good mechanical properties, water resistance, and easy accessibility. To ensure the safe high-efficiency heat dissipation without negative impact on device operation, these polymer nanocomposite TC films generally need to show an integrated performance portfolio—that is, high λ, desired fire safety, and low ε (or low dielectric loss) [10–16]. To date, very few successes have been achieved in simultaneously meeting these requirements due to the often conflicting mechanisms governing thermal conductivity, flame retardancy, and dielectric properties.
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Qiang Chen, Jiabing Feng, Yijiao Xue, Siqi Huo, Toan Dinh, Hang Xu, Yongqian Shi, Jiefeng Gao, Long-Cheng Tang, Guobo Huang, Weiwei Lei, Pingan Song (2025). An Engineered Heterostructured Trinity Enables Fire-Safe, Thermally Conductive Polymer Nanocomposite Films with Low Dielectric Loss. Nano-Micro Letters. https://doi.org/10.1007/s40820-025-01681-9
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Frequently Asked Questions
What is the main achievement of this research?
The research develops a waterborne polyurethane (WPU) nanocomposite film with a heterostructured nanoadditive (FG@CuP@ZTC) that simultaneously achieves high thermal conductivity (12.7 W m−1 K−1), low dielectric constant (2.92 at 106 Hz), and significantly improved flame retardancy (55.6% increase in LOI, 66% reduction in peak heat release rate) and mechanical strength (93.3% increase in tensile strength).
How does the trinity strategy work?
The trinity strategy involves in situ self-assembly immobilization of copper-phenyl phosphonate (CuP) and zinc-3,5-diamino-1,2,4-triazole complex (ZTC) onto fluorinated graphene (FG) surfaces. This creates a synergistic heterostructure that combines the thermal conductivity of graphene, the flame-retardant and dielectric properties of the metal complexes, and the mechanical reinforcement of the nanofillers.
What are the potential applications of this material?
The developed polymer nanocomposite films are intended for use as advanced thermal dissipators in high-power-density microelectronics, such as 5G devices, integrated circuits, and other miniaturized electronic systems where efficient heat dissipation, fire safety, and low signal transmission loss are critical.
What is the significance of the bionic layer-by-layer (LBL) strategy?
The bionic LBL strategy mimics natural nacre-like structures to achieve a well-dispersed and aligned arrangement of nanofillers within the polymer matrix. This enhances the interfacial interactions and synergistic effects, leading to improved thermal conductivity, mechanical strength, and flame retardancy without compromising dielectric properties.
Is this approach commercially viable?
Yes, the authors claim that the rational design strategy is commercially viable because it uses waterborne polyurethane (an environmentally friendly polymer) and a simple in situ self-assembly process that can be scaled up for industrial production, offering a practical solution for manufacturing high-performance multifunctional polymer films.
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