Method for preparing CoSb3 nanometer particle film

Abstract

The invention relates to a CoSb3 thermoelectric material, in particular to a method for preparing a CoSb3 nanometer particle film. The method comprises the following steps of: firstly, weighing CoC12.6H2O powder and Sb powder according to the molar ratio of 1:3; respectively filling the powder into respective crucible; putting the crucibles and glass slide substrates into a quartz pipe; placing the quartz pipe into a horizontal pipe type furnace; vacuumizing and aerating mixed air of 95 percent of argon and 5 percent of hydrogen for multiple times and removing oxygen in the quartz pipe; raising the temperature of the tubular pipe; performing chemical vapor deposition on the glass slide substrates in a low-pressure state to acquire the CoSb3 nanometer particle film; and testing Seebeck coefficient, conductivity and heat conductivity of the CoSb3 nanometer particle film and calculating a zone time (ZT) value of the CoSb3 nanometer particle film. According to the invention, the CoSb3 nanometer particle film is synthesized by one step, the process is simple, and the diameter of the prepared CoSb3 nanometer particle is between 200 and 400nm; and moreover, the CoSb3 thermoelectric material has good conductivity and low heat conductivity, can be directly used for thermoelectricity researches, and is used for novel high-efficiency thermoelectric conversion devices.

Description

technical field [0001] The present invention relates to CoSb 3 Thermoelectric materials, specifically a CoSb 3 Preparation method of nanoparticle film. Background technique [0002] The use of thermoelectric conversion can make full use of abundant geothermal energy, industrial waste heat, and waste heat from automobile exhaust. The promotion and use of thermoelectric materials can help reduce the use of fossil fuels, greenhouse gas emissions, and the destruction of the ozone layer. Therefore, in the environment Today, with increasingly serious pollution and energy crisis, thermoelectric materials have broad application prospects, and it is of great significance to carry out research on new thermoelectric materials; the thermoelectric conversion performance of thermoelectric materials is characterized by the dimensionless figure of merit ZT, ZT=S 2 σT / κ, where S is the Seebeck coefficient, σ is the electrical conductivity, κ is the thermal conductivity, and T is the absolu...

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Problems solved by technology

[0003] CoSb 3 The material is a new type of thermoelectric material in the middle temperature zone, which has high Seebeck coefficient and electrical conductivity, but its thermal conductivity is Bi 2 Te 3 Nearly 10 times that of the material (see literature: 1. Liu W S, Zhang B P, Li J F, et al. J Appl Phys, 2007, 102: 103717), resulting in low thermoelectric conversion efficiency, using nano-sized CoSb 3 The material method can effectively reduce its thermal conductivity, thereby improving its thermoelectric performance. At present, the commonly used preparation CoSb 3 The methods of nanomaterials mainly include sol-gel method (see literature: 1. Yang L, Hng H H, Cheng H, et al. Mater Lett, 2008, 62: 2483), polyol method (see literature: 1. Yang L , Hng H H, Li D, et al. J Appl Phys, 2009, 106:013705), and electrochemical deposition method (see literature: 1. Mi J L, Zhao X B, Zhu T J, et al. Appl Phys Lett, 2007, 91: 172116); however, the above preparation methods usually require the removal of CoSb 3 Inorganic templates or organic substances coated on the surface of nanomaterials need subsequent processing before they can be used as thermoelectric materials. Therefore, it is urgent to develop a simple preparation of CoSb 3 method of nanomaterials, and the preparation of CoSb 3 Nanomaterials can be directly used in thermoelectric research without further processing

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