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Oxygen-containing lanthanum sulfate thin film and preparation method thereof by layer-by-layer self assembly of nanosheets

A layer-by-layer self-assembly and lanthanum sulfate technology, applied in the field of material science, can solve the problems of low film-forming speed, inappropriateness, and uncontrollable film thickness, etc., and achieve the effect of high film-forming quality and fast film-forming rate

Active Publication Date: 2018-06-29
BOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The common preparation methods of thin film materials include vacuum evaporation coating, sputtering coating, chemical vapor deposition (CVD, MOCVD) and chemical liquid phase method, etc., but the above methods often have high requirements for equipment and raw materials and low film forming speed. Film thickness can not be adjusted and other issues
And the above methods are not suitable for the preparation of La 2 o 2 SO 4 film

Method used

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  • Oxygen-containing lanthanum sulfate thin film and preparation method thereof by layer-by-layer self assembly of nanosheets
  • Oxygen-containing lanthanum sulfate thin film and preparation method thereof by layer-by-layer self assembly of nanosheets
  • Oxygen-containing lanthanum sulfate thin film and preparation method thereof by layer-by-layer self assembly of nanosheets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] An oxygen-containing lanthanum sulfate film, the film thickness is 5-10nm; the composition of the oxygen-containing lanthanum sulfate film is La 2 o 2 SO 4 , wherein, according to the molar ratio of elements, La: O: S=2:6:1;

[0043] A method for preparing nano-sheet layer self-assembly of lanthanum oxysulfate film, comprising the following steps:

[0044] (1) Prepare the solution

[0045] Lanthanum nitrate hexahydrate (La(NO 3 ) 3 ·6H 2 O) Mix well in deionized water to prepare La 3+ Lanthanum nitrate (La(NO) with a concentration of 0.03mol / L 3 ) 3 ) solution;

[0046] (2) ammonium sulfate particles ((NH 4 ) 2 SO 4 ) is dissolved in the prepared lanthanum nitrate solution and stirred for 10 minutes. When the solution is transparent and clear, the ammonium sulfate particles are fully dissolved to obtain a mixed solution of lanthanum nitrate and ammonium sulfate; wherein, the prepared lanthanum nitrate and sulfate In the mixed solution of ammonium, by molar ...

Embodiment 2

[0059] An oxygen-containing lanthanum sulfate film, the film thickness is 40-50nm; the composition of the oxygen-containing lanthanum sulfate film is (La, Eu) 2 o 2 SO 4 , wherein, by element molar ratio, (La+Eu):O:S=2:6:1; by molar ratio, La:Eu=17:3.

[0060] A method for preparing nano-sheet self-assembly of lanthanum oxysulfate thin films, comprising the following steps:

[0061] (1) Prepare the solution

[0062] Lanthanum nitrate hexahydrate (La(NO 3 ) 3 ·6H 2 O) Mix well in deionized water to prepare La 3+ Lanthanum nitrate (La(NO) with a concentration of 0.20mol / L 3 ) 3 ) solution;

[0063] Europium nitrate hexahydrate (Eu(NO 3 ) 3 ·6H 2 O) Mix well in deionized water and prepare Eu 3+ Europium nitrate (Eu(NO 3 ) 3 ) solution;

[0064] (2) Mix the prepared lanthanum nitrate solution with the prepared europium nitrate solution to obtain a mixed solution of lanthanum nitrate and europium nitrate; wherein, by molar ratio, lanthanum nitrate: europium nitrate=17...

Embodiment 3

[0077] An oxygen-containing lanthanum sulfate film, the film thickness is 20-30nm; the composition of the oxygen-containing lanthanum sulfate film is (La, Eu) 2 o 2 SO 4 , wherein, by element molar ratio, (La+Eu):O:S=2:6:1; by molar ratio, La:Eu=9:1.

[0078] A method for preparing nano-sheet self-assembly of lanthanum oxysulfate thin films, comprising the following steps:

[0079] (1) Prepare the solution

[0080] Lanthanum nitrate hexahydrate (La(NO 3 ) 3 ·6H 2 O) Mix well in deionized water to prepare La 3+ Lanthanum nitrate (La(NO) with a concentration of 0.10mol / L 3 ) 3 ) solution;

[0081] Europium nitrate hexahydrate (Eu(NO 3 ) 3 ·6H 2 O) Mix well in deionized water and prepare Eu 3+ Europium nitrate (Eu(NO 3 ) 3 ) solution;

[0082] (2) Mix the prepared lanthanum nitrate solution with the prepared europium nitrate solution to obtain a mixed solution of lanthanum nitrate and europium nitrate; wherein, by molar ratio, lanthanum nitrate: europium nitrate=9...

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Abstract

The invention discloses an oxygen-containing lanthanum sulfate thin film and a preparation method thereof by layer-by-layer self assembly of nanosheets, and belongs to the technical field of materialscience. The oxygen-containing lanthanum sulfate thin film is made of (La, Eu)2O2SO4, and is 5-50nm in thickness. The preparation method of the thin film by layer-by-layer self assembly of the nanosheets comprises the following steps: mixing lanthanum nitrate solution and europium nitrate solution, adding and dissolving ammonium sulfate particles, then adding ammonia water, regulating pH to 6-10,reacting the obtained uniform suspension for 1-48 hours at the temperature of minus 4 to 4 DEG C, thus obtaining a product, separating and drying, and then adding absolute ethyl alcohol, thus obtaining nanosheet sol; adopting a spin-coating technology to spin-coat the nanosheet sol on a sapphire substrate subjected to infiltrating pretreatment, and by layer-by-layer spin-coating self assembly, obtaining a (La, Eu)2(OH)4SO4.nH2O precursor thin film; drying and calcining to obtain the (La, Eu)2O2SO4 thin film. The oxygen-containing lanthanum sulfate thin film and the preparation method disclosedby the invention have the advantages that the thickness of the oxygen-containing lanthanum sulfate thin film can be controlled by controlling the thickness of the precursor thin film; the film formation is convenient, and the film formation quality is high.

Description

technical field [0001] The invention belongs to the technical field of material science, and in particular relates to a lanthanum oxysulfate film and a method for preparing the self-assembly of the nanosheet layer. Background technique [0002] Lanthanum oxysulfate (La 2 o 2 SO 4 ) is rare earth oxysulfate (RE 2 o 2 SO 4 ) of a kind. Because the lanthanum element has an empty 4f electron shell, making it an ideal matrix material for luminescent materials. Among the 17 kinds of rare earth oxysulfates, La 2 o 2 SO 4 , Y 2 o 2 SO 4 、Lu 2 o 2 SO 4 , and among them, La 2 o 2 SO 4 As a luminescent substrate, it has the following advantages: 1) The electronegativity of lanthanum is the lowest (about 1.11), which can increase the probability of charge transfer transition and enhance the luminous intensity; 2) La 2 o 2 SO 4 It has the best calcination stability among all rare earth oxysulfates, and can exist stably up to 1200°C during high-temperature calcination...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00B82Y40/00C04B41/50
CPCB82Y40/00C01F17/282C01P2002/72C01P2002/88C01P2004/04C01P2004/20C04B41/009C04B41/5014C04B14/303C04B41/4539C04B41/0072
Inventor 王雪娇董玉娟郑会玲陈双龙王秋实王闯朱革辛双宇
Owner BOHAI UNIV
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