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CdTe quantum dots, preparation method therefor and applications in detection of trace explosives

A technology for quantum dots and quantum dot solutions, applied in the fields of nanometer and analytical chemistry, can solve the problems of not disclosing the technical characteristics of quantum dots for detecting nitroaromatic compounds nanomaterials, and not disclosing the technical enlightenment of quantum dots for detecting nitroaromatic compounds, etc. , to achieve the effect of easy operation, high sensitivity and simple detection

Inactive Publication Date: 2014-01-22
SHANDONG JIAOTONG UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above-mentioned documents do not disclose the technical characteristics of using quantum dots as nanomaterials for detecting nitroaromatic compounds, nor disclose the technical inspiration of using quantum dots as detection nitroaromatic compounds

Method used

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  • CdTe quantum dots, preparation method therefor and applications in detection of trace explosives
  • CdTe quantum dots, preparation method therefor and applications in detection of trace explosives
  • CdTe quantum dots, preparation method therefor and applications in detection of trace explosives

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Effect test

Embodiment 1

[0035] Embodiment 1: a kind of CdTe quantum dot, its preparation method comprises the following steps:

[0036] (1) 0.35mmol of CdCl 2 ·5H 2 O was dissolved in 150mL of deionized water, and under stirring, 0.4mmol of trisodium citrate (Na 3 C 6 h 5 o 7 2H 2 O), 0.07mmol of sodium tellurite (Na 2 TeO 3 ) and 0.4mmol hydrazine hydrate (N2 h 4 ·H 2 0), stirred at room temperature for 5min, then added 0.4mmol methionine, the mixed solution was transferred to a microwave reactor, the control reaction temperature was 90°C, the microwave power was 400W, and the reaction time was 10min to obtain CdTe quantum dots;

[0037] (2) Cool the CdTe quantum dots prepared in (1) to room temperature, add acetone precipitation solution for 10 minutes, and obtain CdTe quantum dot powders.

[0038] The size of the CdTe quantum dots is 4nm. Stored at 4°C for more than half a year, the fluorescence intensity will not decrease by more than 4%.

Embodiment 2

[0039] Embodiment 2: a kind of CdTe quantum dot, its preparation method comprises the following steps:

[0040] (1) 0.35mmol of CdCl 2 ·5H 2 O was dissolved in 150mL of deionized water, and under stirring, 0.5mmol of trisodium citrate (Na 3 C 6 h 5 o 7 2H 2 O), 0.08mmol of sodium tellurite (Na 2 TeO 3 ) and 0.45mmol hydrazine hydrate (N 2 h 4 ·H 2 (0), stirring at room temperature for 10 min, then adding 0.45 mmol methionine, transferring the mixed solution to a microwave reactor, controlling the reaction temperature to be 95° C., the power being 350 W, and the reaction time 15 min to obtain CdTe quantum dots;

[0041] (2) Cool the CdTe quantum dots prepared in (1) to room temperature, add acetone precipitation solution for 10 minutes, and obtain CdTe quantum dot powders.

[0042] The size of the CdTe quantum dots is 6nm.

Embodiment 3

[0043] Embodiment 3: a kind of CdTe quantum dot, its preparation method comprises the following steps:

[0044] (1) 0.35mmol of CdCl 2 ·5H 2 O was dissolved in 150mL of deionized water, and under stirring, 0.45mmol of trisodium citrate (Na 3 C 6 h 5 o 7 2H 2 O), 0.075mmol of sodium tellurite (Na 2 TeO 3 ) and 0.43mmol hydrazine hydrate (N 2 h 4 ·H 2 (0), stirred at room temperature for 7min, then added 0.43mmol methionine, and the mixed solution was transferred to a microwave reactor, the controlled reaction temperature was 93°C, the power was 370W, and the reaction time was 12min, to obtain CdTe quantum dots;

[0045] (2) Cool the CdTe quantum dots prepared in (1) to room temperature, add acetone precipitation solution for 10 minutes, and obtain CdTe quantum dot powders.

[0046] The size of the CdTe quantum dots is 5nm.

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Abstract

The invention discloses CdTe quantum dots, a preparation method therefor and applications in detection of trace explosives, and belongs to the analytical chemistry and nanotechnology fields. The CdTe quantum dots are prepared from cadmium chloride, trisodium citrate, sodium tellurite, hydrazine hydrate and methionine. The quantum dots can be applied in detection of dinitrotoluene explosive. The method has high sensitivity, and dinitrotoluene with a concentration of 1.5*10<-9> mol / L can be detected.

Description

technical field [0001] The invention relates to a CdTe quantum dot, a preparation method thereof and an application for detecting trace explosives, belonging to the fields of analytical chemistry and nanotechnology. Background technique [0002] Quantum dots, also known as semiconductor nanocrystals, are usually composed of II-VI group elements and III-V group elements, such as CdTe, CdSe, CdS, etc. Their physical behavior, such as optical and electrical properties, are similar to atoms, so they are known as As an "artificial atom", its surface is rough and its diameter is between 1-10nm. Its size and shape can be precisely controlled by reaction time, temperature, and ligands. [0003] Compared with traditional organic dyes, quantum dots have unique luminescent properties, such as size-tunable fluorescence emission, narrow and symmetrical emission spectrum, wide and continuous absorption spectrum, and excellent photostability. Quantum dots with different emission wavelengt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/88C01B19/04G01N21/64
Inventor 匡芮赵海丽刘一石朱晓丽冯攸联闫荣金杨文科
Owner SHANDONG JIAOTONG UNIV
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