Room-temperature bismuth telluride (Bi
Te
) thermoelectrics are promising candidates for low-grade heat harvesting. However, the brittleness and inflexibility of Bi
Te
are far reaching and bring ...about lifelong drawbacks. Here we demonstrate good pliability over 1,000 bending cycles and high power factors of 4.2 (p type) and 4.6 (n type) mW m
K
in Bi
Te
-based films that were exfoliated from corresponding single crystals. This unprecedented bendability was ascribed to the in situ observed staggered-layer structure that was spontaneously formed during the fabrication to promote stress propagation whilst maintaining good electrical conductivity. Unexpectedly, the donor-like staggered layer rarely affected the carrier transport of the films, thus maintaining its superior thermoelectric performance. Our flexible generator showed a high normalized power density of 321 W m
with a temperature difference of 60 K. These high performances in supple thermoelectric films not only offer useful paradigms for wearable electronics, but also provide key insights into structure-property manipulation in inorganic semiconductors.
In this work, we investigate the effect of non-uniform dielectric capillary on the light-guiding characteristics of hollow-core negative curvature fibers, specifically the confinement loss and mode ...field diameter (MFD). Our findings suggest that this effect offers considerable flexibility in the guidance band, while maintaining a consistent MFD across various wavelengths. This enables precise adjustment of the guidance band of hollow-core negative curvature fibers based on the wavelength of light, while ensuring MFD stability. These results have potential applications in communication and optical fiber sensing.
Sulfinimine-derived polyfunctionalized chiral building blocks, often prepared in one pot, provide efficient access, with a minimum of chemical manipulation, to enantiopure, multifunctional amine ...derivatives including piperidines and pyrrolidines.
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