N-type Thermoelectric Material via Ferrocyanide Doping
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Solution Overview
Problem
There is a demand for a technique to convert nanomaterials exhibiting p-type conductivity into those exhibiting n-type conductivity for enhanced thermoelectric conversion performance, as existing thermoelectric conversion elements require both p-type and n-type materials, and nanomaterials often exhibit p-type conductivity.
Innovation Solution
An n-type material for thermoelectric conversion is achieved by doping a p-type material containing carbon nanotubes and a conductive resin with a dopant comprising a complex ion anion, an alkali metal cation, and a cation scavenger, such as ferrocyanide ions and crown ether-based compounds, which changes the Seebeck coefficient from positive to negative, thereby converting p-type to n-type conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a p-type nanomaterial is used for thermoelectric conversion, then the material can be easily synthesized with high conductivity, but the thermoelectric conversion performance is limited due to lack of n-type conductivity
Solution Approach 1:
The patent changes the electrical conductivity parameter of the nanomaterial from p-type to n-type by introducing a dopant containing ferrocyanide ions. This parameter change enables the material to achieve negative Seebeck coefficient and n-type conductivity, thereby improving thermoelectric conversion performance while maintaining the nanomaterial's inherent high conductivity characteristics
Solution Approach 2:
The patent uses a dopant containing ferrocyanide ions as an intermediary substance to convert the conductivity type of the nanomaterial. The dopant acts as a mediator that introduces charge carriers and changes the electrical properties of the carbon nanotube-based material from p-type to n-type without fundamentally altering the nanomaterial structure
2Reliability
If a dopant is introduced to convert p-type conductivity to n-type conductivity, then n-type material can be obtained, but the manufacturing process becomes more complex
Solution Approach 1:
The patent combines multiple functions into the dopant formulation: the dopant simultaneously provides ferrocyanide ions for n-type conversion, maintains nanomaterial dispersion, and ensures uniform doping. This merging of functions into a single dopant component simplifies the overall manufacturing process despite achieving complex n-type conversion
Solution Approach 2:
The patent optimizes the dopant concentration parameter to achieve effective n-type conversion without excessive processing steps. By controlling the dopant amount within a specific range, the patent achieves reliable n-type conductivity while keeping the manufacturing process manageable and scalable
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 solution provides a thermoelectric conversion element with excellent performance by effectively converting p-type materials to n-type, improving electric conductivity and storage stability, and enabling the production of high-performance n-type materials for thermoelectric conversion.
Implementation Method 1
doping a p-type material for thermoelectric conversion with a dopant, the p-type material for thermoelectric conversion containing a carbon nanotube and a conductive resin, in which the dopant contains an anion that is a complex ion, an alkali metal cation, and a cation scavenger
Implementation Method 2
Thermoelectric conversion is a technique for directly converting heat into electricity by utilizing a Seebeck effect
Data Source
AI summary
An n-type material for thermoelectric conversion obtained by doping a p-type material for thermoelectric conversion with a dopant, the p-type material for thermoelectric conversion containing a carbon nanotube and a conductive resin, in which the dopant contains an anion that is a complex ion, an alkali metal cation, and a cation scavenger.