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Core-shell Mn:ZnO/Mn:ZnS diluted magnetic semiconductor heterogenous nano material and preparation method thereof

A technology of dilute magnetic semiconductors and nanomaterials, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of difficulty in adjusting the intensity and position of luminescence peaks, difficult control of types and densities, and limited applications, etc. problem, to achieve the effects of easy control of shell thickness, easy control of doping concentration, and low preparation cost

Inactive Publication Date: 2014-05-14
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The good intrinsic ultraviolet luminescence properties of ZnO-based DMS materials make it applicable to DMS ultraviolet detectors; however, the light emission of ZnO in the visible light band is closely related to the type and density of structural defects in the material, because the type and density of structural defects are difficult to detect. Therefore, under normal circumstances, the luminescence of ZnO-based DMS materials in the visible light range is very weak, and the intensity and position of the luminescence peak are difficult to control, which greatly limits its application in the visible light range.

Method used

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  • Core-shell Mn:ZnO/Mn:ZnS diluted magnetic semiconductor heterogenous nano material and preparation method thereof
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  • Core-shell Mn:ZnO/Mn:ZnS diluted magnetic semiconductor heterogenous nano material and preparation method thereof

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Embodiment 1

[0033] Apply the preparation method provided by the present invention to prepare core-shell type Mn:ZnO / Mn:ZnS dilute magnetic semiconductor heterogeneous nanomaterials, the specific steps are as follows:

[0034] (1) Preparation of Mn:ZnO nanorods:

[0035] First prepare the dehydrated ethanol solution of zinc salt and manganese salt: weigh 80mL dehydrated ethanol, Zn(CH 3 COO) 2 2H 2 The concentration of O is 0.05mol / L, Mn(CH 3 COO) 2 4H 2 The concentration of O is 0.0015mol / L; magnetically stir the above ethanol solution at room temperature until the zinc salt and manganese salt are completely dissolved, then slowly add 40mL 0.5mol / L NaOH absolute ethanol solution (PH value 11-12) dropwise into the solution ;Continue to stir for 20-30min, produce precipitation to form turbid liquid, transfer this turbid liquid into a stainless steel reaction kettle with a polytetrafluoroethylene liner (filling degree is 80%); seal the reaction kettle and place it in an oven, heat To 1...

Embodiment 2

[0039] Apply the preparation method provided by the present invention to prepare core-shell type Mn:ZnO / Mn:ZnS dilute magnetic semiconductor heterogeneous nanomaterials, the specific steps are as follows:

[0040] (1) Preparation of Mn:ZnO nanorods:

[0041] First prepare the dehydrated ethanol solution of zinc salt and manganese salt: weigh 90mL dehydrated ethanol, Zn(NO 3 ) 2 ·6H 2 The concentration of O is 0.05mol / L, Mn(NO 3 ) 2 4H 2 The concentration of O is 0.0005mol / L; magnetically stir at room temperature until it is completely dissolved, then slowly add 45mL of 0.8mol / L NaOH absolute ethanol solution (PH value 12-13) dropwise into the solution; keep stirring for 20-30min, and a precipitate occurs The turbid liquid is formed, and the turbid liquid is transferred into a stainless steel reaction kettle with a polytetrafluoroethylene liner (the filling degree is 90%); the reaction kettle is sealed and placed in an oven, heated to 150°C, and kept for 18 hours; The rea...

Embodiment 3

[0046] Apply the preparation method provided by the present invention to prepare core-shell type Mn:ZnO / Mn:ZnS dilute magnetic semiconductor heterogeneous nanomaterials, the specific steps are as follows:

[0047] (1) Preparation of Mn:ZnO nanorods:

[0048] First prepare the absolute ethanol solution of zinc salt and manganese salt: weigh 70mL of absolute ethanol, ZnCl in the prepared ethanol solution 2 The concentration is 0.07mol / L, MnCl 2 The concentration of NaOH is 0.0035mol / L; stir magnetically at room temperature until it is completely dissolved, then slowly add 35mL of 0.6mol / L NaOH absolute ethanol solution (PH value 10-11) dropwise into the solution; keep stirring for 20-30min, and a precipitate forms Turbid liquid; transfer this turbid liquid into a stainless steel reaction kettle with a polytetrafluoroethylene liner (the filling degree is 70%); seal the reaction kettle and place it in an oven, heat it to 120°C, and keep it warm for 12 hours; wait for the reaction...

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Abstract

The invention discloses a core-shell Mn:ZnO / Mn:ZnS diluted magnetic semiconductor heterogenous nano material and a preparation method thereof, belonging to the cross field of spinning electronics and optoelectronics. The material uses Mn-doped ZnO diluted magnetic semiconductor nanorods as the core and Mn-doped ZnS nanoparticles as the shell. The preparation method comprises the following steps: preparing Mn-doped ZnO nanorods by a hydrothermal method; dispersing the Mn-doped ZnO nanorods in a thioacetamide solution; and carrying out sulfurization reaction in a water bath kettle, washing the reaction precipitate, and drying to obtain the diluted magnetic semiconductor heterogenous nano material. The material has ferromagnetic properties at room temperature, and the Curie temperature is higher than 300K; and the material has obvious ultraviolet and visible light luminescent properties, and thus, has important research meanings and favorable application prospects in the fields of spinning electronics and optoelectronics. The preparation method has the advantages of simple steps, simple experimental apparatus, mild reaction conditions and low preparation cost, can easily control the shell thickness and Mn doping amount, and is easy to operate.

Description

technical field [0001] The invention belongs to the interdisciplinary field of spintronics and optoelectronics, and relates to a core-shell type Mn:ZnO / Mn:ZnS dilute magnetic semiconductor heterogeneous nanomaterial with stable ferromagnetism and good luminescence performance at room temperature and a preparation method thereof. Background technique [0002] Diluted Magnetic Semiconductors (DMS) refers to a new class of semiconductors doped with a small amount of transition metal elements or rare earth metal elements, which are formed by magnetic ions instead of non-magnetic cations in the original lattice structure. ferromagnetic semiconductor material. The material can simultaneously utilize the charge properties and spin properties of electrons, and has dual characteristics of semiconductor and magnetic materials. It has broad application prospects in the fields of spintronics and optoelectronics, and can be used to prepare high-density non-volatile memories, New devices...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G9/08C01G9/02B82Y40/00B82Y30/00
Inventor 刘晓芳于荣海
Owner BEIHANG UNIV
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