Recent developments in the physics of high-index resonant dielectric nanostructures suggest alternative mechanisms for subwavelength light control driven by Mie resonances with strong magnetic response that can be employed for a design of novel optical metasurfaces. Here we demonstrate metasurfaces based on nanoimprinted perovskite films optimized by alloying the organic cation part of perovskites. We reveal that such metasurfaces can exhibit a significant enhancement of both linear and nonlinear photoluminescence (up to 70 times) combined with advanced stability. Our results suggest a cost-effective approach based on nanoimprint lithography and combined with simple chemical reactions for creating a new generation of functional metasurfaces which may pave a way towards highly efficient planar optoelectronic metadevices.
Rational optimization of non-noble metal nanomaterials' surface electronic states and physical structures is essential to improve their electrocatalytic performance. Herein, we report a facile dual-regulating strategy to fabricate NiFeP/Ni (P-NiFeP/Ni)...
Continuous silicon carbide fiber reinforced silicon carbide matrix (SiC f /SiC) composites are attractive candidate materials for aerospace engine system and nuclear reactor system. In this paper, SiC f /SiC composites were fabricated by polymer infiltration and pyrolysis (PIP) process using KD-S fiber as the reinforcement and the LPVCS as the precursor, while the BN interface layer was introduced by chemical vapor deposition (CVD) process using borazine as the single precursor. The effect of the BN interface layer on the structure and properties of the SiC f /SiC composites was comprehensively investigated. The results showed that the BN interface layer significantly improved the mechanical properties of the KD-S SiC f /SiC composites. The flexure strength and fracture toughness of the KD-S SiC f /SiC composites were evidently improved from 314±44.8 to 818±39.6 MPa and 8.6± 0.5 to 23.0±2.2 MPa·m 1/2 , respectively. The observation of TEM analysis displayed a turbostratic structure of the CVD-BN interface layer that facilitated the improvement of the fracture toughness of the SiC f /SiC composites. The thermal conductivity of KD-S SiC f /SiC composites with BN interface layer was lower than that of KD-S SiC f /SiC composites without BN interface layer, which could be attributed to the relative low thermal conductivity of BN interface layer with low crystallinity.
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