An optimized polymer composite material that offer higher dielectric constant and refractive index at essentially room temperature that makes it invaluable for energy storage devices and/or as a functionalized coating to trigger invisibility of the substrate.
Polymer composites are a combination of polymers, e.g., thermosets or thermoplastics, with various reinforcements and fillers added to the base polymers to improve their performance in a specific application. The composite preparation methods are invasive and typically result in damage to the fillers. Functional composites usually require a strong base material - filler coupling, e.g., polymer - graphene coupling is needed to increase the overall thermal conductivity. Significant efforts are expended to finding innovative fillers, e.g., metallic or ferroelectric, to increase the dielectric constant of the composites.
Prof. Alex Balandin and his team have synthesized a novel polymer composite with fillers comprised of van der Waals materials including transition metal dichalcogenide (TMD) and transition metal trichalcogenide (TMT) families that reveal strongly correlated charge density wave (CDW) quantum properties. The unique functionality of these quantum composites are defined by the strongly correlated quantum phenomenon in the fillers. Their unique functionality is based on the phase transition that happens at a temperature of ~360 K (room temperature is 300K) making the fillers more metallic leading to a strong increase in the dielectric function of the composites.
Summary of the composite preparation steps
Graph of the dielectric constant, ε1, measured by the parallel capacitance method as a function of temperature for a PVD composite with 1T-TaS2 fillers on a logarithmic scale (y-axis).
The uniqueness and significant benefits of these polymer composites are:
Potential applications of this technology, include:
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quantum composite, capacitor, energy storage, dielectric constant, refractive index, optical coating