Investigation of photothermal properties of Bismuth-Tin core-shell particles derived from liquid metals

Date

2024-7-29

Author

Şeyda, Doğu

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

141
views

130
downloads

Cite This

This thesis investigates the photothermal properties of bismuth-tin (BiSn) core-shell particles derived from liquid metals, focusing on their structural characterization and optical properties. Utilizing a droplet emulsion technique, particles were synthesized from BiSn alloy at eutectic composition of 58 wt.% Bi, resulting in a liquid metallic core surrounded by a shell predominantly composed of defect-rich SnO. Optical characterization revealed that BiSn core-shell particles possess broadband light absorption capabilities across the visible, and near-infrared regions at the level of 80%. Photothermal experiments demonstrated that particles exhibited rapid temperature increases under laser, reaching surface temperatures up to 150 °C within seconds. The photothermal conversion efficiencies of the particles were calculated and compared with other liquid metal-based photothermal systems, underscoring the superior performance of BiSn particles. The ability to control the core-shell structure through heat treatment significantly influenced the photothermal properties, providing a pathway to explore the mechanism. The defect-rich SnO shell and the high thermal conductivity of the BiSn core facilitate efficient light-to-heat conversion, up to 90% efficiency. Light absorption abilities of the particles were demonstrated in a water heating device under sunlight. Additionally, their use as light-sensitive layers for soft actuators was explored. Rapid heating/cooling capabilities of the particles were effective for laser light-triggered actuation of polydimethylsiloxane (PDMS) actuators produced via different design routes. This thesis contributes to the growing body of knowledge on liquid metal-derived photothermal materials, offering insights into the synthesis, characterization, and application of BiSn core-shell particles, highlighting the potential of these materials to advance light energy-related technologies through their enhanced photothermal performance.

Subject Keywords

Photothermal Conversion, Bismuth-Tin, Liquid Metal, Core-Shell Nanoparticles, Solar Energy

URI

https://hdl.handle.net/11511/110506

Collections

Graduate School of Natural and Applied Sciences, Thesis