Solution concentration detection method based on photothermal conversion nano-material temperature change

A technology of photothermal conversion materials and nanomaterials, which is applied in the field of detecting solution concentration based on the temperature change of photothermal conversion nanomaterials, can solve the problems of not easy to carry instruments, high instrument requirements, and difficulty in realizing movable detection, etc., and achieves easy portability. , The effect of simple materials and low cost

Active Publication Date: 2017-02-22
CAPITAL NORMAL UNIVERSITY
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Problems solved by technology

However, the current common analysis methods have high requirements for instruments...

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  • Solution concentration detection method based on photothermal conversion nano-material temperature change
  • Solution concentration detection method based on photothermal conversion nano-material temperature change
  • Solution concentration detection method based on photothermal conversion nano-material temperature change

Examples

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Embodiment 1

[0062] Embodiment 1, detect hydrogen peroxide (H 2 o 2 ) concentration of aqueous solution:

[0063] 1) Drawing of standard curve: 200 μL of 250pM, 500pM, 1nM, 2nM, 4nM hydrogen peroxide (H 2 o 2 ) aqueous solution and 800 μL 200 μg / mL indocyanine green modified NaLuF 4 : The Yb and Er aqueous solutions are evenly mixed, and after standing at room temperature (25°C) for 10 minutes, the reaction is complete. Measure the temperature change of the mixed solution after 2 minutes of irradiation with 785nm near-infrared light, process the data to obtain a linear spectrum of temperature, and obtain the concentration A standard curve versus temperature, such as figure 2 shown, from figure 2 It can be known that the linearity of the standard spectrum is good, the correlation coefficient R reaches 0.9959, and the minimum detection limit can reach 63pM.

[0064] 2) Hydrogen peroxide (H 2 o 2 ) detection of aqueous solution concentration: 200μL of 1nM hydrogen peroxide (H 2 o ...

Embodiment 2

[0065] Embodiment 2, detect hydrogen peroxide (H 2 o 2 ) concentration of aqueous solution:

[0066] 1) Drawing of standard curve: 200 μL of 1nM, 2nM, 4nM, 8nM, 16nM hydrogen peroxide (H 2 o 2 ) aqueous solution with 800 μL of 200 μg / mL silver-coated NaGdF 4 : The Yb and Er aqueous solutions are evenly mixed, and after standing at room temperature (25°C) for 20 minutes, the reaction is complete. Measure the temperature change of the mixed solution after 2 minutes of irradiation with 808nm near-infrared light, process the data to obtain a linear spectrum of temperature, and obtain the concentration A standard curve versus temperature, such as image 3 shown, from image 3 It can be known that the linearity of the standard spectrum is good, the correlation coefficient R reaches 0.99678, and the minimum detection limit can reach 200pM.

[0067] 2) Hydrogen peroxide (H 2 o 2 ) detection of aqueous solution concentration: 150μL of 5nM hydrogen peroxide (H 2 o 2 ) aqueous ...

Embodiment 3

[0068] Embodiment 3, detect the concentration of ascorbic acid (AA) aqueous solution:

[0069] 1) Drawing of standard curve: 200 μL of 500pM, 1nM, 2nM, 4nM, 8nM, 16nM ascorbic acid (AA) aqueous solution and 800μL 200μg / mL triangular silver nanosheet aqueous solution were evenly mixed, and left to stand at room temperature (25°C) for 10 minutes after reaction , the reaction is complete, and the temperature change of the mixed solution after 2 minutes of irradiation is measured under 980nm near-infrared light irradiation, and the linear spectrum of temperature is obtained by processing the data, and the standard curve of concentration and temperature is obtained, such as Figure 6 shown, from Figure 6 It can be known that the linearity of the standard spectrum is good, the correlation coefficient R reaches 0.99832, and the minimum detection limit can reach 50nM.

[0070] 2) Detection of the concentration of ascorbic acid (AA) aqueous solution: Mix 200 μL of 3 nM ascorbic acid ...

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Abstract

The invention provides a solution concentration detection method based on photothermal conversion nano-material temperature change. The method includes the steps of: 1) synthesizing a nano-material containing a photothermal conversion material to obtain a photothermal conversion nano-material; 2) using a series of standard concentration to-be-detected solutions to react with the photothermal conversion nano-material respectively so as to obtain a series of mixed solutions, and detecting the temperature change of the mixed solution at one time point under near-infrared light illumination respectively, and drawing a standard curve of temperature and concentration; and 3) completely according to the method of step 2), detecting the temperature change of an unknown to-be-detected solution at one time point, and performing comparison with the standard curve, thus obtaining the concentration of the to-be-detected solution. The method provided by the invention can realize fast, sensitive and portable quantitative detection on a variety of substances, like food, drugs, living samples and the like, and has the advantages of simple operation, good linear effect, low detection limit, low cost, portable instrument, and mobile detection, etc.

Description

technical field [0001] The invention belongs to the technical field of analysis and detection, and in particular relates to a method for detecting solution concentration based on the temperature change of photothermal conversion nanomaterials. Background technique [0002] Analytical detection technology is the use of specified methods to test the specified technical performance indicators of test gases, liquids or solids. It is suitable for quality assessment in various industries, such as environment, food safety, water quality, etc. At present, common analytical methods include optical detection and electrochemical detection. However, the current common analysis methods have high requirements for instruments, the instruments are not easy to carry, and it is difficult to realize mobile detection. Contents of the invention [0003] The purpose of the present invention is to provide a method for detecting solution concentration based on the temperature change of photothe...

Claims

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Application Information

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IPC IPC(8): G01N21/63
Inventor 周晶刘瑜鑫郭权炜贾琪
Owner CAPITAL NORMAL UNIVERSITY
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