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Method for synthesis of cadmium selenide quantum dot by using thiourea dioxide as reducing agent

A technology of thiourea dioxide and cadmium selenide, applied in chemical instruments and methods, measuring devices, nanotechnology and other directions, can solve the problems of long reaction time, expensive reducing agent, violent reaction, etc., and achieve short reaction time, mild reaction conditions, The method has good repeatability

Inactive Publication Date: 2016-03-16
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the existing synthetic method of cadmium selenide quantum dots uses expensive reducing agent or toxic reagent, the reaction is relatively violent, and the problem of long reaction time, and provides a kind of thiourea dioxide as reducing agent to synthesize selenium The method of cadmium quantum dots

Method used

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  • Method for synthesis of cadmium selenide quantum dot by using thiourea dioxide as reducing agent
  • Method for synthesis of cadmium selenide quantum dot by using thiourea dioxide as reducing agent
  • Method for synthesis of cadmium selenide quantum dot by using thiourea dioxide as reducing agent

Examples

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Embodiment 1

[0034] (1) Add 5mL0.1MNaOH (pH9) solution to the three-necked flask, which contains 0.6mmol of selenium powder and 2.0mmol of thiourea dioxide, and heat and reflux at 100°C for 60min to obtain a negative divalent selenium ion precursor solution;

[0035] (2) 1mmol cadmium chloride was dissolved in 3mL water, then 2.5mmol mercaptoacetic acid was added, and the pH of the solution was adjusted to 9 with sodium hydroxide to obtain a cadmium precursor solution;

[0036] (3) The cadmium precursor solution was quickly added to the colorless and transparent negative divalent selenium ion precursor solution obtained in (1), and refluxed at 100° C. for 2.5 hours to obtain cadmium selenide quantum dots.

Embodiment 2

[0038] (1) Add 5mL of 0.1M NaOH (pH12) solution to the three-necked flask, which contains 0.6mmol of selenium powder and 2.0mmol of thiourea dioxide, and heat and reflux at 100°C for 60min to obtain a negative divalent selenium ion precursor solution;

[0039] (2) Dissolve 1mmol cadmium chloride in 3mL water, then add 2.5mmol thioglycolic acid, and adjust the pH of the solution to 12 with sodium hydroxide to obtain a cadmium precursor solution;

[0040] (3) The cadmium precursor solution was quickly added to the colorless and transparent negative divalent selenium ion precursor solution obtained in (1), and refluxed at 100° C. for 2.5 hours to obtain cadmium selenide quantum dots.

Embodiment 3

[0042] (1) Add 5 mL of 0.1M NaOH (pH13) solution into a three-necked flask, which contains 0.6 mmol of selenium powder and 2.0 mmol of thiourea dioxide, and heat and reflux at 100 ° C for 60 min to obtain a negative divalent selenium ion precursor solution;

[0043] (2) 1mmol cadmium chloride was dissolved in 3mL water, then 2.5mmol mercaptoacetic acid was added, and the pH of the solution was adjusted to 13 with sodium hydroxide to obtain a cadmium precursor solution;

[0044] (3) The cadmium precursor solution was quickly added to the colorless and transparent negative divalent selenium ion precursor solution obtained in (1), and refluxed at 100° C. for 2.5 hours to obtain cadmium selenide quantum dots.

[0045] image 3 (A) is the fluorescence emission spectrogram of the quantum dots obtained at different pHs of the growth solutions of Examples 1-3 of the present invention, wherein curve 1 represents a pH of 9, curve 2 represents a pH of 12, and curve 3 represents a pH of 1...

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Abstract

The invention provides a method for synthesis of cadmium selenide quantum dot by using thiourea dioxide as a reducing agent, and belongs to the technical field of quantum dot synthesis. The method is as below: first dissolving selenium powder and thiourea dioxide in NaOH solution to obtain a negative divalent selenium ion precursor solution; then mixing cadmium chloride solution and mercaptoacetic acid to obtain a mixed solution; adjusting the pH value of the solution to 9-13 to obtain a cadmium precursor solution; and finally adding the cadmium precursor solution into the negative divalent selenium ion precursor solution, and reacting to obtain cadmium selenide quantum dots. The invention uses thiourea dioxide as the reducing agent for synthesis of efficient fluorescent cadmium selenide quantum dots. The reducing agent of the present invention is inexpensive and easy to get; the preparation method has mild reaction conditions, short reaction time and good repeatability; and after modification by boric acid, the quantum dots can be used as probes for rapid and sensitive detection of hydrogen peroxide.

Description

technical field [0001] The invention belongs to the technical field of quantum dot synthesis methods, and in particular relates to a method for synthesizing cadmium selenide quantum dots with thiourea dioxide as a reducing agent. Background technique [0002] Due to its unique optical and electronic properties, cadmium selenide quantum dots have attracted great attention and been applied in many fields. Many methods have been reported for the synthesis of cadmium telluride quantum dots, such as ultrasonic method, microwave-assisted solution method and Aqueous phase synthesis methods, etc. Among them, the aqueous phase synthesis method is more popular because it avoids the use of toxic reagents during the synthesis process. All synthetic methods require the reduction of selenium (Se) to its precursor selenium (Se 2- ), many reagents can be used to prepare selenium precursors, including selenium dioxide and ammonia, selenium and sodium borohydride, selenium powder and sodium...

Claims

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Application Information

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IPC IPC(8): C09K11/88B82Y40/00B82Y20/00G01N21/64
CPCC09K11/883B82Y20/00B82Y40/00G01N21/643G01N2021/6432
Inventor 徐国宝马吉德·萨德特高文跃
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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