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Synthesis and Evaluation of Thermoelectric Group 15 Chalcogenide Nanomaterials
The overconsumption of fossil fuels is raising serious concerns as to the escalation of the worldwide energy crisis and the disastrous effects of climate change. Despite the technological efforts to produce and use energy more efficiently, most electrical, and mechanical processes including machinery operation, industrial processing, and solid waste incinerations, lose more than 60 % of untapped energy in the form of waste heat. In recent years, thermoelectric materials have sparked great interest due to their ability to convert waste heat directly and reversibly into electrical energy. To achieve high conversion efficiency, these solid-state devices require zT values of above 1.5, which until today remains a critical challenge. The aim of this doctoral thesis is the synthesis of thermoelectric group 15 tetradymite-type nanoparticles, namely Sb2Te3, Bi2Te3, Bi2Se3, (BixSb1−x)2Te3, and Bi2(SexTe1−y)3. The wet-chemical syntheses of these materials often involve the thermal decomposition of metal organic precursors in conventional organic solvents, which typically lead to impurity phases. In addition, these approaches use organic capping agents to stabilize the particle surface, which inevitably lead to surface contamination. By developing and optimizing new and established synthetic routes, as well as utilizing tailor-made and temperature-stable ionic liquid precursors, we attempt to improve the overall quality and chemical cleanliness of the here-targeted nanomaterials for better thermoelectric properties. The scope of research in this doctoral thesis is briefly outlined as follows: Chapter 1 of this dissertation presents a comprehensive review on the fundamentals of thermoelectricity, the applications of current thermoelectric devices, and the key optimization strategies via nanostructuring. A brief introduction on topological insulators is also provided. In chapter 2, the main challenges, objectives, and conceptual approaches of this doctoral study to fabricating thermoelectric group 15 chalcogenide ...
Synthesis and Evaluation of Thermoelectric Group 15 Chalcogenide Nanomaterials
The overconsumption of fossil fuels is raising serious concerns as to the escalation of the worldwide energy crisis and the disastrous effects of climate change. Despite the technological efforts to produce and use energy more efficiently, most electrical, and mechanical processes including machinery operation, industrial processing, and solid waste incinerations, lose more than 60 % of untapped energy in the form of waste heat. In recent years, thermoelectric materials have sparked great interest due to their ability to convert waste heat directly and reversibly into electrical energy. To achieve high conversion efficiency, these solid-state devices require zT values of above 1.5, which until today remains a critical challenge. The aim of this doctoral thesis is the synthesis of thermoelectric group 15 tetradymite-type nanoparticles, namely Sb2Te3, Bi2Te3, Bi2Se3, (BixSb1−x)2Te3, and Bi2(SexTe1−y)3. The wet-chemical syntheses of these materials often involve the thermal decomposition of metal organic precursors in conventional organic solvents, which typically lead to impurity phases. In addition, these approaches use organic capping agents to stabilize the particle surface, which inevitably lead to surface contamination. By developing and optimizing new and established synthetic routes, as well as utilizing tailor-made and temperature-stable ionic liquid precursors, we attempt to improve the overall quality and chemical cleanliness of the here-targeted nanomaterials for better thermoelectric properties. The scope of research in this doctoral thesis is briefly outlined as follows: Chapter 1 of this dissertation presents a comprehensive review on the fundamentals of thermoelectricity, the applications of current thermoelectric devices, and the key optimization strategies via nanostructuring. A brief introduction on topological insulators is also provided. In chapter 2, the main challenges, objectives, and conceptual approaches of this doctoral study to fabricating thermoelectric group 15 chalcogenide ...
Synthesis and Evaluation of Thermoelectric Group 15 Chalcogenide Nanomaterials
Salloum, Sarah (author) / Schulz, Stephan
2022-03-21
Theses
Electronic Resource
English
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