A synthesis method of cadmium telluride quantum dots and a synthesis method of type II cadmium telluride core-shell quantum dots

A technology for cadmium telluride quantum dots and a synthesis method is applied in the field of synthesis of quantum dots and achieves the effects of excellent environmental safety, mild reaction conditions and reasonable economy.

Inactive Publication Date: 2016-03-09
CHAOHU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

One-pot heating without phosphine to synthesize cadmium telluride quantum dots, and in-situ phosphine-free heating method to generate type II cadmium telluride core-shell quantum dots have not yet been successfully developed.

Method used

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  • A synthesis method of cadmium telluride quantum dots and a synthesis method of type II cadmium telluride core-shell quantum dots
  • A synthesis method of cadmium telluride quantum dots and a synthesis method of type II cadmium telluride core-shell quantum dots
  • A synthesis method of cadmium telluride quantum dots and a synthesis method of type II cadmium telluride core-shell quantum dots

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1: Synthesis of CdTe quantum dots in octadecene medium

[0037] 0.2mmol cadmium stearate, 0.2mmolTe(OCH 2 CH 2 O) 2 , 0.80mmol of dodecyl mercaptan and 9.60g of octadecene were added to a 25mL three-necked flask, protected by argon, heated to 220°C at a heating rate of 20°C / min under stirring, and kept for 5 minutes; to 240°C (heating time is 40min), heat preservation reaction for 5min, stop heating after the reaction is over, pour the reaction liquid into 50mL of absolute ethanol when the reaction liquid is cooled to 50°C, precipitate cadmium telluride quantum dots, and then anhydrous Ethanol is used as a non-solvent, n-hexane is used as a solvent, the cadmium telluride quantum dots are precipitated and dissolved three times, the quantum dots are purified, and finally dried.

[0038] When the temperature of the reaction solution reaches 220°C, samples are taken at regular intervals, added to toluene, and spectroscopically measured to observe the reaction pro...

Embodiment 2

[0039] Example 2: Synthesis of CdTe / CdS quantum dots in octadecene medium

[0040] 0.2mmol cadmium stearate, 0.2mmolTe(OCH 2 CH 2 O) 2 , 0.80mmol of dodecyl mercaptan and 9.60g of octadecene were added to a 25mL three-necked flask, protected by argon, heated to 220°C at a heating rate of 20°C / min under stirring, and kept for 5 minutes; to 230°C (heating time is 10min), heat preservation reaction for 5min, and stop heating after the reaction; when the reaction solution is cooled to 100°C, add 0.2mmol cadmium stearate and 0.19mmol diallyl disulfide (prepared to 0.2mol / Diallyl disulfide octadecene solution of L) was added), the temperature was raised to 180-190°C at a heating rate of 10°C / min, the heat preservation reaction was carried out for 40min, and the heating was stopped to complete the first shelling; When the temperature is below 100°C, add 0.2mmol cadmium stearate and 0.19mmol diallyl disulfide (prepared to add 0.2mol / L diallyl disulfide octadecene solution) to the ...

Embodiment 3

[0042] Example 3: Synthesis of CdTe / CdSe quantum dots in octadecene medium

[0043] 0.2mmol cadmium stearate, 0.2mmolTe(OCH 2 CH 2 O) 2 , 0.80mmol of dodecyl mercaptan and 9.60g of octadecene were added to a 25mL three-necked flask, protected by argon, heated to 220°C at a heating rate of 20°C / min under stirring, and kept for 5 minutes; to 240°C (heating time is 30min), heat preservation reaction for 5min, and stop heating after the reaction; when the reaction liquid is cooled to 100°C, add 0.2mmol cadmium stearate and 0.19mmol dibenzyl selenide (prepared to 0.2mol / L Dibenzyl selenide octadecene solution is added), the heating rate is 15°C / min, the temperature is raised to 200-210°C, the heat preservation is 35min, the heating is stopped, and the first shelling is completed; when the temperature of the reaction solution drops below 100°C, it is heated again Add 0.2mmol cadmium stearate and 0.19mmol dibenzyl selenide (prepared into 0.2mol / L dibenzyl selenide octadecene solut...

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Abstract

The invention discloses a synthesis method of cadmium telluride quantum dots and a synthesis method of Type II cadmium telluride core-shell quantum dots. The synthesis method of cadmium telluride quantum dots comprises the following steps: adding a cadmium source, a tellurium source, a ligand and an organic dielectric into a reaction kettle at room temperature, heating to 220 DEG C in a nitrogen or argon protective atmosphere to react for 5-20 minutes, heating to 230-245 DEG C, and keeping the temperature to react for 5-30 minutes to obtain the cadmium telluride quantum dots. The chemical structural formula of the Type II cadmium telluride core-shell quantum dot is CdTe/CdSe or CdTe/CdS, and the process of coating cadmium selenide or cadmium sulfide on the cadmium telluride quantum dots is performed by a phosphine-free in-situ heating process. The synthesized cadmium telluride quantum dots and Type II cadmium telluride core-shell quantum dots can emit 530-800nm; and in the 550-650nm wave band, the fluorescent quantum yield is greater than or equal to 40%, and the maximum yield can reach 75%.

Description

1. Technical field [0001] The invention relates to a synthesis method of quantum dots, in particular to a synthesis method of cadmium telluride quantum dots and a synthesis method of type II cadmium telluride core-shell quantum dots. 2. Background technology [0002] Quantum dots are one of the hot topics in current nanomaterial technology. The emission spectrum of cadmium telluride quantum dots can cover the entire visible light region and the near-infrared region with the change of size, and can achieve a high quantum yield after surface modification. It is currently being intensively studied as a quantum dot. Cadmium telluride quantum dots have good photoelectric properties, and they have shown good application prospects in optoelectronic devices such as solar cells, sensors, transistors, and photoelectric detection, as well as in biological detection and imaging, chemical analysis detection, and photocatalysis. However, the research on the synthesis technology of cadmiu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B19/04
CPCC01B19/04C01P2002/72C01P2002/84C01P2004/04C01P2004/32C01P2004/64C01P2006/60
Inventor 张忠平蒋阳蓝新正常亚婧姚旭东王辉李国鹏
Owner CHAOHU UNIV
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