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Method for preparing CdSe quantum dots by water phase via one-pot method

A water-phase preparation and quantum dot technology, which is applied in the field of CdSe quantum dot preparation, can solve the problems of complex operation and low CdSe quantum dots

Inactive Publication Date: 2013-07-24
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is complicated to operate, and the anaerobic condition must be strictly controlled. It is very necessary to use a stable selenium source as a precursor to synthesize CdSe quantum dots.
On the other hand, CdSe quantum dots synthesized in water are generally low

Method used

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  • Method for preparing CdSe quantum dots by water phase via one-pot method
  • Method for preparing CdSe quantum dots by water phase via one-pot method
  • Method for preparing CdSe quantum dots by water phase via one-pot method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1 investigates the optimal reaction time of the synthesis of MSA-CdSe quantum dots

[0017] Weigh respectively 0.0022 gram of sodium selenite (Na 2 SeO 3 ), 0.0203 grams of cadmium chloride (CdCl 2 2.5H 2 (0) and 0.0230 gram of mercaptomalic acid (MSA) are placed in the two-necked flask of 50 milliliters, add 20 milliliters in the flask, and concentration is the acid buffer solution of 15 mmol / liter sodium borate-citric acid (weighs 2.8603 gram Na 2 B 4 o 7 10H 2 O and 1.5761 g C 6 h 8 o 7 ·H 2 0, with a 500 milliliter volumetric flask to constant volume), magnetic stirring, after dissolving, adjust the pH value of the solution to 5.0, then weigh 0.0126 gram of sodium borohydride powder and place it in the flask, after stirring for three minutes, heat to reflux at 60°C, and Start timing, draw a certain amount of solution at different times, and measure the UV and fluorescence of the solution respectively. Such as figure 1 As shown, as the reflow t...

Embodiment 2

[0018] Embodiment 2 investigates the optimal pH value of the synthesis of MSA-CdSe quantum dots

[0019] Weigh respectively 0.0022 gram of sodium selenite (Na 2 SeO 3 ), 0.0076 grams of cadmium chloride (CdCl 2 2.5H 2 (0) and 0.0191 gram of mercaptomalic acid (MSA) are placed in the two-necked flask of 50 milliliters, add 20 milliliters in the flask, and concentration is the sodium borate-citric acid buffer solution of 15 mmol / liter (weighs 2.8603 gram Na 2 B 4 o 7 10H 2 O and 1.5761 g C 6 h 8 o 7 ·H 2 0, with a 500 ml volumetric flask to constant volume), magnetic stirring, after dissolving, after adjusting the pH value of the solution, weighing 0.0126 grams of sodium borohydride powder and placing it in the flask, stirring for three minutes, heating to reflux at 80°C, and starting Timing, the reaction is finished after 60 minutes, and the fluorescence corresponding to each pH value is measured respectively, such as figure 2 As shown, the acidic condition is favor...

Embodiment 3

[0020] Embodiment 3 investigates the best (Cd) of the synthesis of MSA-CdSe quantum dot 2+ / SeO 3 2- ) molar ratio

[0021] Weigh respectively 0.0022 gram of sodium selenite (Na 2 SeO 3 ), different amounts of cadmium chloride (CdCl 2 2.5H 2 (0) and 0.0191 gram of mercaptomalic acid (MSA) are placed in the two-necked flask of 50 milliliters, add 20 milliliters in the flask, and concentration is the sodium borate-citric acid buffer solution of 15 mmol / liter (weighs 2.8603 gram Na 2 B 4 o 7 10H 2 O and 1.5761 g C 6 h 8 o 7 ·H 2 0, with a 500 ml volumetric flask to constant volume), magnetic stirring, after dissolving, adjust the pH value of the solution to 5.0, then weigh 0.0126 grams of sodium hydride powder and place it in the flask, stir for three minutes, heat to reflux at 80°C, and start Timing, the reaction was terminated after 60 minutes, and the corresponding fluorescence under the conditions of each molar ratio was measured respectively. From image 3 It ...

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Abstract

The invention discloses a method for preparing CdSe quantum dots by a water phase via a one-pot method, and belongs to the technical field of semiconductor nano-luminescent materials. In the method, mercaptobutanedioic acid (MSA) is used as a stabilizer, sodium selenite is used as a selenium source, sodium borohydride is used as a reducer, and sodium borate-citric acid buffering solution is used as a reaction system, and highly-luminescent CdSe quantum dots can be prepared via heating reaction in certain temperature and pH conditions in the open air; and finally, the purified MSA-CdSe quantum dots can be obtained via centrifugal separation. By adopting the method, the quantum dots having emission wavelengths located in green light can be prepared, as well as are high in fluorescence productivity, uniform in particle size distribution, and good in stability.

Description

technical field [0001] The invention relates to a preparation method in the field of preparing semiconductor nanomaterials, in particular to a preparation method for preparing CdSe quantum dots with low toxicity and high fluorescence efficiency in water phase. Background technique [0002] Compared with organic fluorescent dyes, quantum dots present many obvious advantages in in vivo and in vitro imaging: such as high fluorescence quantum yield, tunable emission wavelength, multiplexing function, and strong resistance to photobleaching. Among them, CdSe, CdTe, and CdS quantum dots have been extensively studied because their emission wavelengths in the visible region can be tuned by changing the diameter of nanoparticles and the synthesis method. [0003] CdSe quantum dots have been widely studied in different fields, especially in the field of cell imaging and biomarking. Generally speaking, there are two basic routes for the synthesis of CdSe quantum dots: one is tradition...

Claims

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Application Information

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IPC IPC(8): C09K11/88
Inventor 黄朝表董美婷刘淑贤徐静怡梁孟超
Owner ZHEJIANG NORMAL UNIVERSITY
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