Method for measuring Seebeck coefficient of micro/nano thermoelectric materials or devices

A Seebeck coefficient and thermoelectric material technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of increasing the complexity of the preparation process, and achieve the effect of simple experimental devices and high measurement accuracy

Active Publication Date: 2012-01-04
TSINGHUA UNIV
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  • Abstract
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Problems solved by technology

These test methods all need to install a micro-heater or radiation heating device at one end of the sample to realize the temperature difference, and need to add a thermocouple or a temperature-measuring element obtained by micro-processing in the temperature test. On the one hand, the complexity of the preparation process is increased. On the other hand, Aspects will inevitably have additional measurement errors

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  • Method for measuring Seebeck coefficient of micro/nano thermoelectric materials or devices
  • Method for measuring Seebeck coefficient of micro/nano thermoelectric materials or devices
  • Method for measuring Seebeck coefficient of micro/nano thermoelectric materials or devices

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Embodiment Construction

[0017] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0018] A K-type thermocouple with a diameter of 25.4 μm (Omega Engineering, positive nickel-chromium Ni:Cr=90:10, negative nickel-silicon Ni:Si=97:3) was used for experimental verification at 298K, and the physical parameters of the tested samples are shown in Table 1 shown.

[0019] Table 1 Physical property parameters of the tested samples

[0020]

[0021]

[0022] Such as figure 1 As shown, the test sample is formed by connecting the first nano-thermoelectric material 11 (the positive pole of the K-type thermocouple) and the second nano-thermoelectric material 12 (the negative pole of the K-type thermocouple), and the other end of the first nano-thermoelectric material 11 is connected to the first Heat sink 21, the other end of the second nanometer thermoelectric material 12 is connected with the second heat sink 22, passes through...

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Abstract

The invention discloses a method for measuring the Seebeck coefficient of micro/nano thermoelectric materials or devices, which comprises the following steps of: connecting the two ends of a sample formed by connecting two thermoelectric materials with heat sinks, putting into a vacuum environment, introducing alternating current I0 sin(omega t) with frequency omega and amplitude I0, generating parabolic temperature distribution on the sample to be measured through a Joule heating effect, and adding one steady component and two harmonic components to obtain the temperature at a junction of the materials to be measured, wherein for the thermoelectric materials, the steady temperature component at the junction and a temperature difference formed at the heat sink ends can generate direct-current Seebeck thermal electromotive force due to a Seebeck effect; and acquiring a direct-current voltage signal and theoretically solving a steady temperature difference simultaneously, so that the Seebeck coefficient of the thermoelectric materials to be measured can be obtained. The method has the advantages of high measuring accuracy, simple experiment device, low test cost and the like, and iseasy to implement, and a new idea is provided for evaluating and representing a micro/nano scale thermoelectric conversion system.

Description

technical field [0001] The invention belongs to the technical field of thermoelectric performance testing of micro-nano thermoelectric conversion materials, and in particular relates to a method for measuring the Seebeck coefficient of micro-nano thermoelectric materials or devices. Background technique [0002] With the increasing energy crisis and environmental problems, the thermoelectric conversion system based on the thermoelectric effect has attracted widespread attention due to its unique advantages. Compared with other technologies, the thermoelectric conversion system has the advantages of no mechanical moving parts, compact structure, easy miniaturization and miniaturization, no noise, no pollution, easy maintenance, and long service life. It has broad application prospects in many fields such as energy saving and environmental protection. The main problem facing current thermoelectric materials is the low thermoelectric conversion efficiency. Nanotechnology has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/20G01R31/00
Inventor 缪婷婷马维刚张兴
Owner TSINGHUA UNIV
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