We investigated thermal properties of the epoxy-based composites with high loading fraction-up to f ≈ 45 vol %-of randomly oriented electrically conductive graphene fillers and insulating boron nitride fillers. It was found that both types revealed a distinctive percolation threshold at fraction fT > 20 %. The required for achieving percolation, fT, substantially higher than loading, fE, electrical percolation. Graphene outperformed in conductivity enhancement. established transport filler...

Abstract Development of next‐generation thermal interface materials (TIMs) with high conductivity is important for management and packaging electronic devices. The synthesis measurements noncuring paste, i.e., grease, based on mineral oil a mixture graphene few‐layer flakes as the fillers, reported. paste exhibits distinctive percolation threshold revealing sublinear dependence filler loading. This behavior contrasts curing TIMs, epoxy, where superlinear loading observed. performance...

We report results regarding the electron transport in vertical quasi-two-dimensional (2D) layered 1T-TaS2 charge-density-wave (CDW) devices. The low-frequency noise spectroscopy was used as a tool to study changes cross-plane electrical characteristics of quasi-2D material below room temperature. spectral density revealed strong peaks—changing by more than an order-of-magnitude—at temperatures closely matching resistance steps. Some peaks appeared temperature commensurate nearly-commensurate...

We investigated the temperature dependence of current fluctuations in thin films quasi-two-dimensional 1T-TaS2 van der Waals material. The fluctuations, determined from derivative current–voltage characteristics two-terminal devices, appear prominently at electric fields that correspond to transitions between various charge-density-wave macroscopic quantum condensate phases and onset depinning charge density wave domains. threshold field, ED, monotonically increases with decreasing within...

We report the results of an experimental study that compares performance graphene and boron nitride flakes as fillers in thermal interface materials. The thickness both varied from a single atomic plane to about hundred. measurements have been conducted using standard TIM tester. Our show addition small fraction (f=4 wt%) commercial material increases resulting apparent conductivity substantially stronger than nitride. obtained data suggest fewlayer couple better matrix materials fillers. A...

We investigated thermal properties of the epoxy-based composites with a high loading fraction - up to f=45 vol.% randomly oriented electrically conductive graphene fillers and insulating boron nitride fillers. It was found that both types revealed distinctive percolation threshold at f>20 vol.%. The required for achieving substantially higher than electrical percolation. Graphene outperformed in conductivity enhancement. established transport filler loading, above threshold, is dominated...

We report on heat conduction properties of thermal interface materials with self-aligning "magnetic grapheme" fillers. Graphene enhanced nano-composites were synthesized by an inexpensive and scalable technique based liquid-phase exfoliation. Functionalization graphene few-layer-graphene flakes Fe3O4 nanoparticles allowed us to align the fillers in external magnetic field during dispersion paste connecting surfaces. The filler alignment results a strong increase apparent conductivity...

Prevention of excess heat accumulation within the Li-ion battery cells is a critical design consideration for electronic and photonic device applications. Many existing approaches removal from batteries increase substantially complexity overall weight battery. Some us have previously shown possibility effective passive thermal management via improvement conductivity cathode anode material¹. In this presentation, we report results our investigation various cathodes with...

We report the results of an experimental study thermal and magnetic properties nanostructured ferrimagnetic iron oxide composites with graphene graphite fillers synthesized via current activated pressure assisted densification. The conductivity was measured using laser-flash transient plane source techniques. It demonstrated that addition 5 wt. % equal mixture flakes to composite in a factor x2.6 enhancement without significant degradation saturation magnetization. microscopy spectroscopic...

Nanostructured permanent magnets are gaining increasing interest and importance for applications such as generators motors. Thermal management is a key concern since performance of decreases with temperature. We investigated the magnetic thermal transport properties rare-earth free nanostructured SrFe12O19 produced by current activated pressure assisted densification. The synthesized have aligned grains that their easy axis perpendicular to largest surface area maximize performance. fine...

Li-ion batteries are crucial components for progress in mobile communications and transport technologies. However, suffer from strong self-heating, which limits their life-time creates reliability environmental problems. Here we show that thermal management the of can be drastically improved using hybrid phase change material with graphene fillers. Conventional relies on latent heat stored as its changes over a small temperature range, thereby reducing rise inside battery. Incorporation to...

We investigated the temperature dependence of conductance fluctuations in thin films quasi-two-dimensional 1T-TaS$_2$ van der Waals material. The fluctuations, determined from derivative current-voltage characteristics two-terminal devices, appear prominently at electric fields that correspond to transitions between various charge-density-wave macroscopic quantum condensate phases and onset depinning charge density wave domains. threshold field, $E_D$, monotonically increases with decreasing...