3D Nanostructured Thermoelectric Material Phonon Scattering
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Solution Overview
Problem
Thermoelectric materials face a trade-off between Seebeck coefficient, electrical conductivity, and thermal conductivity, limiting their figure of merit, and the manufacturing of nanostructures with improved performance is challenging.
Innovation Solution
A 3-dimensional nanostructure is created by connecting 2-dimensional and 1-dimensional nanostructures, enhancing phonon scattering and maintaining electron transfer efficiency, which is achieved through a method involving a thermoelectric material precursor solution stirred at high temperature and treated with a reducing agent to form a nano-tree structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a nanostructure is introduced to decrease thermal conductivity, then the figure of merit increases, but the manufacturing complexity increases
Solution Approach 1:
The bulk material is segmented into numerous nanostructures (nanowires, nanoplates, nanospheres) with sizes of 1-100 nm. This segmentation creates extensive internal interfaces that scatter phonons effectively, reducing thermal conductivity while maintaining electrical conductivity. The segmentation is achieved through a simple one-step hydrothermal synthesis method rather than complex multi-step nanostructure fabrication processes.
Solution Approach 2:
The patent changes the size parameter of the material structures from bulk scale to nano-scale (1-100 nm). This parameter change fundamentally alters the phonon scattering mechanisms, reducing lattice thermal conductivity while preserving electrical transport properties. The size parameter is controlled through synthesis conditions (temperature, time, precursors) rather than complex lithography or self-assembly processes.
2Reliability
If a Seebeck coefficient, electrical conductivity, and thermal conductivity are increased to improve energy conversion efficiency, then the performance improves, but the trade-off relationship between these parameters limits the figure of merit
Solution Approach 1:
The patent creates materials with non-uniform local structures, including core-shell configurations, hierarchical arrangements, and mixed morphologies (combining nanowires, nanoplates, and nanospheres). These local quality variations create regions with different electronic and thermal transport properties, allowing simultaneous optimization of Seebeck coefficient, electrical conductivity, and thermal conductivity at the micro-scale while maintaining bulk material form.
Solution Approach 2:
The patent produces composite nanostructures containing multiple phases or components (e.g., core-shell structures with different materials, or composites of different nanostructure types). These composite structures exploit the synergistic effects of constituent materials to achieve high Seebeck coefficient from one component, high electrical conductivity from another, while the interface between components provides phonon scattering for reduced thermal conductivity.
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
This approach results in a thermoelectric material with increased electrical conductivity, reduced thermal conductivity, and improved figure of merit, facilitating efficient energy conversion while being easier to manufacture in bulk form.
Implementation Method 1
forming a 3-dimensional nanostructure by adding a reducing agent in the solution including the seed to prepare the thermoelectric material
Implementation Method 2
scattering of phonons at interfaces of the nanostructure can increases. In this regard, thermal conductivity can be decreased
Implementation Method 3
Another example is the Seebeck effect, in which an electromotive force is generated due to a temperature difference between the ends of the dissimilar materials that are connected at the contact point
Implementation Method 4
One example of the thermoelectric phenomenon includes the Peltier effect, in which two dissimilar materials are connected at a contact point where heat is released or absorbed due to a current applied from the outside
Data Source
AI summary
A thermoelectric material including a 3-dimensional nanostructure, wherein the 3-dimensional nanostructure includes a 2-dimensional nanostructure connected to a 1-dimensional nanostructure.