Low-thermal conductivity bismuth sulfide polycrystalline thermoelectric material and preparation method thereof
A technology of low thermal conductivity and thermoelectric materials, applied in the growth of polycrystalline materials, chemical instruments and methods, single crystal growth, etc., can solve the problems of reducing thermal conductivity, time-consuming and energy-consuming, unfavorable, etc., to reduce thermal conductivity , improve thermoelectric performance, and prevent the effect of grain growth
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Embodiment 1
[0043] Prepare by molar ratio: bismuth nitrate / thiourea=1:2, weigh the corresponding mass of bismuth nitrate and thiourea as raw materials, use deionized water as solvent, add bismuth nitrate and thiourea into deionized water, and mix evenly by ultrasonic ;Put the mixed bismuth nitrate and thiourea in a hydrothermal kettle for hydrothermal reaction at 140°C for 6 hours to obtain a flower cluster precursor powder self-assembled by bismuth sulfide nanorods; the precursor powder will be obtained Put it into a conductive induction mold, place the conductive induction mold in the radio frequency induction furnace and heat it from room temperature to 100°C at a rate of 15-20K / min; vacuumize the radio frequency induction furnace and pass inert The gas was heated to 220°C at a rate of 20K / min, and a pressure of 75MPa was applied at the 220°C, kept at this pressure for 30 minutes and then cooled to room temperature with the furnace to obtain a polycrystalline bismuth sulfide block.
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Embodiment 2
[0046] Prepare by molar ratio: bismuth nitrate / thiourea=1:2, weigh the corresponding mass of bismuth nitrate and thiourea as raw materials, use deionized water as solvent, add bismuth nitrate and thiourea into deionized water, and mix evenly by ultrasonic ; Put the mixed bismuth nitrate and thiourea in a hydrothermal kettle for hydrothermal reaction at 200°C for 6 hours to obtain a flower cluster precursor powder self-assembled by bismuth sulfide nanorods; the precursor powder will be obtained Put it into a conductive induction mold, place the conductive induction mold in the radio frequency induction furnace and heat it from room temperature to 100°C at a rate of 15-20K / min; vacuumize the radio frequency induction furnace and pass inert The gas was heated to 220°C at a rate of 20K / min, and a pressure of 75MPa was applied at the 220°C, kept at this pressure for 30 minutes and then cooled to room temperature with the furnace to obtain a polycrystalline bismuth sulfide block.
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Embodiment 3
[0049] Prepare by molar ratio: bismuth nitrate / thiourea=1:2, weigh the corresponding mass of bismuth nitrate and thiourea as raw materials, use deionized water as solvent, add bismuth nitrate and thiourea into deionized water, and mix evenly by ultrasonic ;Put the mixed bismuth nitrate and thiourea in a hydrothermal kettle for hydrothermal reaction at 200°C for 24 hours to obtain a flower cluster precursor powder self-assembled by bismuth sulfide nanorods; the precursor powder will be obtained Put it into a conductive induction mold, place the conductive induction mold in the radio frequency induction furnace and heat it from room temperature to 100°C at a rate of 15-20K / min; vacuumize the radio frequency induction furnace and pass inert The gas was heated to 220°C at a rate of 20K / min, and a pressure of 75MPa was applied at the 220°C, kept at this pressure for 30 minutes and then cooled to room temperature with the furnace to obtain a polycrystalline bismuth sulfide block.
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