Preparation and thermoelectric properties of bismuth telluride intercalated superlattice materials

Flexible thermoelectric devices have the advantages of strong bending resistance and durability and can be used in wearable devices with broad application prospects. Bismuth telluride is a thermoelectric material with the best performance at room temperature, but its flexibility is poor, and its application in thin film devices is limited. Organic intercalation of layered thermoelectric materials is a means to improve flexibility and optimize thermoelectric properties. Based on this, this project intends to establish a preparation method for bismuth telluride organic intercalated superlattice materials, systematically study the mechanism of intercalated molecules such as species, molecular weight, polarity, and superlattice interface on the structure and thermoelectric properties of bismuth telluride intercalated materials, and realize effective regulation of the microstructure and thermoelectric properties of the obtained superlattice composites. Due to their mechanical flexibility and wide range of adjustable compositions and properties, inorganic and organic hybrid thermoelectric materials have become one of the research hotspots. This study proposes a preparation Bi2Se3Hexylamonium0. 11 dmso0—six new methods of inorganic, organic superlattice materials. The method involves lithium intercalation, ion exchange, and organic molecular exchange reactions. The results show that organic molecules enlarge bismuth selenide's interlayer spacing, forming a three-layer structure. Among them, n-hexylamine cations formed ionic bonds with the negatively charged bismuth selenide layer. Due to the weakening of interlayer interaction and phonon restriction effect, the lattice vibration mode of the bismuth selenide layer in the hybrid superlattice structure is softened. Hybrid materials Bi2Se3Hexylamonium0. 11 dmso0. 06 room temperature power factor (including 950 W/m, K2, power factor is one of the best n-type flexible materials. Due to the effective inhibition of lattice thermal conductivity, the ZT value increases greatly. This study provides a new method for preparing inorganic and organic intercalated superlattice materials. It is expected to be an effective method for preparing flexible materials with high thermoelectric properties. If you are looking for high quality, high purity and cost-effective bismuth telluride, or if you require the latest price of bismuth telluride, please feel free to email contact mis-asia.

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