The electric field cavity array effect of 2D nano-sieves

Abstract

For the upsurge of high breakdown strength ($${{{{{{\rm{E}}}}}}}_{{{{{{\rm{b}}}}}}}$$ E b ), efficiency ($${{{{{\rm{\eta }}}}}}$$ η ), and discharge energy density ($${{{{{{\rm{U}}}}}}}_{{{{{{\rm{e}}}}}}}$$ U e ) of next-generation dielectrics, nanocomposites are the most promising candidates. However, the skillful regulation and application of nano-dielectrics have not been realized so far, because the mechanism of enhanced properties is still not explicitly apprehended. Here, we show that the electric field cavity array in the outer interface of nanosieve-substrate could modulate the potential distribution array and promote the flow of free charges to the hole, which works together with the intrinsic defect traps of active Co3O4 surface to trap and absorb high-energy carriers. The electric field and potential array could be regulated by the size and distribution of mesoporous in 2-dimensional nano-sieves. The poly(vinylidene fluoride-co-hexafluoropropylene)-based nanocomposites film exhibits an $${{{{{{\rm{E}}}}}}}_{{{{{{\rm{b}}}}}}}$$ E b of 803 MV m−1 with up to 80% enhancement, accompanied by high $${{{{{{\rm{U}}}}}}}_{{{{{{\rm{e}}}}}}}$$ U e = 41.6 J cm−3 and $${{{{{\rm{\eta }}}}}}\,$$ η ≈ 90%, outperforming the state-of-art nano-dielectrics. These findings enable deeper construction of nano-dielectrics and provide a different way to illustrate the intricate modification mechanism from macro to micro.

Chemical Vapor Deposition Growth of 2D Ferroelectric Materials for Device Applications

“…Consequently, one of the research hotspots is the study of low-dimensional ferroelectric materials. [51][52][53][54] 2D material is a type of material composed of a layered structure with ultrathin thickness, resulting in exceptional characteristics in terms of electrical, optoelectrical, and magnetic performance. [55,56] Unrestricted by the size effect of tra-ditional perovskite oxides, 2D materials can surpass the increased depolarization field that existed in ultrathin ferroelectric materials, paving the approach for studying low-dimensional ferroelectrics and achieving ultrathin high-density devices.…”

Gradient core–shell structure enabling high energy storage performances in PVDF-based copolymers

“…Several effective strategies have been developed to overcome this challenge, such as using composites, where llers could be inorganic nanomaterials with various morphologies to largely enhance the dielectric constant 8,9 and small molecules providing deep traps for boosting the breakdown strength (E b ) 10 or via forming all-organic hybrids, [11][12][13] designing multilayer structures to maintain high insulation and suppressing electric breakdown. [14][15][16] Compared with nanocomposites, which involve nanoller synthesis and interface modication, 17 blending different polymers is much simpler in terms of fabrication process, and produced hybrid lms possess intrinsic high insulation.…”