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BULK NANOSTRUCTURED COPPER SELENIDES FOR THERMOELECTRIC APPLICATIONS
KTH, Skolan för informations- och kommunikationsteknik (ICT).
2016 (engelsk)Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
Abstract [en]

Thermoelectric materials can be straightforwardly defined as materials that, when subject to a temperature gradient will generate a potential difference between their cold and hot side. This peculiar feature can be exploited in heat-flow related products, such as local cooling and energy harvesting, but has been up to now limited to niche applications due to high cost of the devices and limited availability of raw materials used. Copper Selenides based thermoelectric materials have gained more and more popularity due to their relatively low cost, large availability of raw materials and high figure of merit (zT) at medium-high temperatures. Many production processes, though, revolve around time consuming and expensive top-down procedures, a common example is bulk alloying followed by ball-milling, thus outweighing the lower price advantage of said raw materials. The process proposed is instead based on microwave assisted thermolysis, an inherently bottom-up route. The precursors are dissolved in a Trioctylphosphine, Oleic Acid and 1-Octadecene solution and then heated up to the required temperature by use of microwave irradiation. The synthesis is carried out at various temperatures and following different mixing procedures in order to optimize thephase distributions obtained. The finalized processing allows compositional and crystallographic control, furthermore it also shows promise for industrial scalability. The powders produced present nanoscale dimensionality ranging from an average of 60 to 300 nanometers. The particles can be compacted by Spark Plasma Sintering (SPS) and conserve nano-structured features after this step. Details of microstructure and crystallinity are studied previous toand after SPS procedure. Further analysis on lattice conductivity, electrical properties and thermoelectric efficiency are carried out on the sintered samples.

sted, utgiver, år, opplag, sider
2016. , s. 79
Serie
TRITA-ICT-EX ; 2016:137
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-207019OAI: oai:DiVA.org:kth-207019DiVA, id: diva2:1095206
Fag / kurs
Engineering Physics
Utdanningsprogram
Degree of Master
Veileder
Examiner
Tilgjengelig fra: 2017-05-12 Laget: 2017-05-12 Sist oppdatert: 2017-05-12bibliografisk kontrollert

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