Preparation method of PbAgTe ternary nanowire

A nanowire and solution technology, which is applied in the field of phase change storage and thermoelectric nanomaterials, can solve the problems of adjusting the uniformity of nanowire size, cumbersome preparation method of nanoparticles, and poor universality.

Inactive Publication Date: 2012-07-18
TIANJIN UNIV
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Problems solved by technology

However, the preparation methods of nanoparticles obtained by physical deposition and multi-step methods are cumbersome, poor in applicability, and require expensive film-making equipment
However, the diameter distribution of nanowires prepared by vapor deposition is relatively wide (30-100 nanometers), and it is difficult to adjust the uniformity of nanowire size by changing experimental parameters.

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  • Preparation method of PbAgTe ternary nanowire
  • Preparation method of PbAgTe ternary nanowire
  • Preparation method of PbAgTe ternary nanowire

Examples

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Effect test

Embodiment 1

[0024] 1. Raw materials: analytically pure H 6 TeO 6 , AgOAc, Pb(OAc) 2 ·3H 2 O.

[0025] 2. Place 0.6 grams of PVP (K30, MW=10000) in a reaction kettle lined with polytetrafluoroethylene with a volume of 25 milliliters, add 7.5 milliliters of double distilled water at room temperature, and magnetically stir to form A homogeneous solution (that is, a PVP solution with a mass fraction of 7.41%).

[0026] 3. Take a 20ml glass bottle and weigh 0.0574g of H 6 TeO 6 (H 6 TeO 6 The mass ratio with PVP is 0.10), add 3 milliliters of twice distilled water, ultrasonic makes it dissolve completely, obtains the H that mass fraction is 1.88% 6 TeO 6 solution. Add it into the autoclave in the second step under magnetic stirring, and continue to stir for 5 minutes to make it fully mixed.

[0027]4. Add 1 ml of 25% ammonia water to the kettle to make the pH of the solution 10, add 0.5 ml of 85% hydrazine hydrate (the solution changes from colorless to brown), and magnetically stir...

Embodiment 2

[0032] 1. Raw materials: analytically pure H 6 TeO 6 , AgOAc, Pb(OAc) 2 ·3H 2 O.

[0033] 2. Place 0.6 g of PVP (K30, MW=10000) in a 50 ml reaction kettle lined with polytetrafluoroethylene, add 15 ml of double distilled water at room temperature, and magnetically stir to form A homogeneous solution (that is, a PVP solution with a mass fraction of 3.85%).

[0034] 3. Take a 20ml glass bottle and weigh 0.1148g of H 6 TeO 6 (H 6 TeO 6 The mass ratio with PVP is 0.19), add 6 milliliters of double distilled water, ultrasonic makes it dissolve completely, obtains the mass fraction that is 1.88% H 6 TeO 6 solution. Add it into the autoclave in the second step under magnetic stirring, and continue to stir for 10 minutes to make it fully mixed.

[0035] 4. Add 2 milliliters of 25% ammonia water to the kettle to make the pH of the solution 10.5, add 1 milliliter of 85% hydrazine hydrate to make the solution change from colorless to brown, and then magnetically stir for 5 min...

Embodiment 3

[0040] 1. Raw materials: analytically pure H 6 TeO 6 , AgOAc, Pb(OAc) 2 ·3H 2 O.

[0041] 2. Place 0.8 g of PVP (K30, MW=10000) in a 50 ml reaction kettle lined with polytetrafluoroethylene, add 15 ml of double distilled water at room temperature, and magnetically stir to form A homogeneous solution (that is, a PVP solution with a mass fraction of 5.06%).

[0042] 3. Take a 20ml glass bottle and weigh 0.2296g of H 6 TeO 6 (H 6 TeO 6 The mass ratio with PVP is 0.29), add 6 milliliters of double distilled water, ultrasonic makes it dissolve completely, obtains the mass fraction that is 3.69% H 6 TeO 6 solution. Add it into the autoclave in the second step under magnetic stirring, and continue to stir for 10 minutes to make it fully mixed.

[0043] 4. Add 2 milliliters of 25% ammonia water to the kettle to make the pH of the solution 10.5, add 1 milliliter of 85% hydrazine hydrate (the solution changes from colorless to brown), and magnetically stir for 5 minutes, then...

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Abstract

The invention relates to a preparation method of a PbAgTe ternary nanowire, which comprises the steps of: synthesis of a Te nanowire template: preparing a PVP (Polyvinyl Pyrrolidone) solution in a reaction kettle, then preparing a telluric acid solution, adding H6TeO6 to a reaction kettle holding the PVP solution in a mass ratio of the H6TeO6 to the PVP being 0.10-0.29, then adding aqueous ammonia and hydrazine hydrate in the reaction kettle, and reacting for 4 hours at 180 DEG C to obtain a Te template solution for standby; synthesis of an AgTe binary nanowire: preparing a silver acetate solution in a mass ratio of AgOAc to the PVP being 0.01-0.10, adding the Te template solution obtained in the former step in an equal mole ratio, mixing for 12 hours at room temperature to obtain an AgTebinary nanowire solution for standby; and synthesis of the PbAgTe ternary nanowire: preparing a lead acetate trihydrate solution in a mass ratio of Pb(OAc)2*3H2O to the PVP being 0.01-0.16, then adding the AgTe solution processed in the former step in a mole ratio of Pb to Ag to Te being 0.4-1: 1: 1, and mixing for 12 hours at room temperature to obtain the PbAgTe ternary nanowire. The ternary nanowire synthesized by the method has a diameter of 32-38 nanometers, is uniform in size, and is a good material for researching the phase-changing storage performance and the thermoelectric performance of a single nanowire.

Description

technical field [0001] The invention relates to a method for preparing PbAgTe ternary nanowires, belonging to the technical fields of phase change storage and thermoelectric nanometer materials. Background technique [0002] The understanding of phase change storage and thermoelectric nanomaterials has a long history. Chalcogenide random access memory (C-RAM) is a memory based on the Ovshinsky electronic effect proposed by Ovshinshy in the late 1960s. C-RAM uses electric energy to convert materials between crystalline and amorphous states to realize information writing and erasing, and information reading is realized by measuring changes in resistance. From the advent of the first computer with storage function to the popularization of various mobile multimedia applications, storage technology has brought huge profits to people. C-RAM can fully demonstrate its superiority only when the size of the storage unit reaches the nanometer scale. Therefore, in today's popularizati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/46C30B7/14
Inventor 张兵侯双霞张华于一夫许友崔建华张晋
Owner TIANJIN UNIV
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