Core-Shell Nanoparticle Thermoelectric Sintering Process
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Solution Overview
Problem
Current thermoelectric materials face challenges in optimizing their electrical conductivity and Seebeck coefficient while minimizing thermal conductivity, as these parameters are interrelated, making it difficult to enhance thermoelectric conversion efficiency.
Innovation Solution
A process involving core-shell nanoparticles with a silica core and a bismuth telluride shell doped with selenium, subjected to a specific temperature and pressure range during sintering, to achieve optimized electrical conductivity and Seebeck coefficient values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nanostructured materials are used to improve thermoelectric properties, then conversion efficiency improves, but manufacturing complexity and cost increase
Solution Approach 1:
The patent utilizes combustion synthesis to pre-form nanostructured bismuth telluride particles with controlled size and distribution before embedding them in the matrix. This preliminary nanostructure formation simplifies subsequent processing steps and reduces manufacturing complexity compared to direct consolidation of nanostructured powders.
Solution Approach 2:
The invention replaces complex mechanical nanostructuring processes (such as ball milling or ultrasonic treatment) with a chemical combustion synthesis approach that naturally produces nanostructured particles. This substitution eliminates the need for complex mechanical equipment and multiple processing steps while achieving the desired nanostructure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The process results in a thermoelectric component with a combined electrical conductivity and Seebeck coefficient squared value greater than 30,000 at 150°C, enhancing the conversion of thermal gradients to electrical energy.
Implementation Method 1
the nanoparticles are subjected to a sintering process in which they are sintered within a predetermined temperature range and a predetermined pressure range
Data Source
AI summary
A process for forming a thermoelectric component having optimum properties is provided. The process includes providing a plurality of core-shell nanoparticles, the nanoparticles having a core made from silica, metals, semiconductors, insulators, ceramics, carbon, polymers, combinations thereof, and the like, and a shell containing bismuth telluride. After the core-shell nanoparticles have been provided, the nanoparticles are subjected to a sintering process. The result of the sintering provides a bismuth telluride thermoelectric component having a combined electrical conductivity and Seebeck coefficient squared of greater than 30,000 μV2S/mK2 at 150° C.