Non-contact ultra-low temperature sensing up-conversion nanoprobe and preparation method and application of non-contact ultra-low temperature sensing up-conversion nanoprobe

A non-contact, nano-probe technology, applied in thermometers, chemical instruments and methods, thermometers with physical/chemical changes, etc., can solve the problems of sensitivity, rare earth-doped up-conversion fluorescent probes not suitable for ultra-low temperature ranges, etc. , to achieve the effects of increasing the intensity of fluorescence emission, enhancing the ability to resist interference from environmental factors, and detecting high-sensitivity temperature

Active Publication Date: 2021-02-02
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the technical problems that the existing rare-earth-doped up-conversion fluorescent probes used for temperature sensing are not suitable for use in

Method used

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  • Non-contact ultra-low temperature sensing up-conversion nanoprobe and preparation method and application of non-contact ultra-low temperature sensing up-conversion nanoprobe
  • Non-contact ultra-low temperature sensing up-conversion nanoprobe and preparation method and application of non-contact ultra-low temperature sensing up-conversion nanoprobe
  • Non-contact ultra-low temperature sensing up-conversion nanoprobe and preparation method and application of non-contact ultra-low temperature sensing up-conversion nanoprobe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Example 1: The non-contact ultra-low temperature sensing up-conversion nanoprobe α-NaYF of this example 4 @NaY 0.79 f 4 :Yb 0.20 3+ / Tm 0.01 3+ @CaF 2 The preparation method, carry out according to the following steps:

[0056] 1. Preparation of α-NaYF 4 Nanocrystalline core:

[0057] (1) First take by weighing the yttrium oxide (Yttria) that total amount is 0.5mmol 2 o 3 ) raw materials, and placed in a 100mL three-neck flask, added 5mL of trifluoroacetic acid with a concentration of 50% by mass, and fully stirred at 90°C to completely dissolve the medicine;

[0058] (2) Dry the liquid in the there-necked flask with argon to obtain 1.0mmol yttrium trifluoroacetate [Y(CF 3 COO) 3 ] solid powder, then add 2mmol sodium trifluoroacetate (CF 3 COONa), 8mL oleic acid, 8mL oleylamine and 12mL of octadecene, stir to obtain a mixed solution;

[0059] (3) Heat the mixed solution to 120°C, and blow argon into the mixed solution for 30 minutes under an argon atmosphe...

Embodiment 2

[0082] Example 2: The non-contact ultra-low temperature sensing up-conversion nanoprobe α-NaYF of this example 4 @NaY 0 f 4 :Yb 0.99 3+ / Tm 0.01 3+ @NaYF 4 The preparation method, carry out according to the following steps:

[0083] 1. Preparation of α-NaYF 4 Nanocrystalline Core:

[0084] (1) First take by weighing the yttrium oxide (Yttria) that total amount is 0.5mmol 2 o 3 ) raw materials, and placed in a 100mL three-neck flask, added 5mL of trifluoroacetic acid with a concentration of 50% by mass, and fully stirred at 90°C to completely dissolve the medicine;

[0085] (2) Dry the liquid in the there-necked flask with argon to obtain 1.0mmol yttrium trifluoroacetate [Y(CF 3 COO) 3 ] solid powder, then add 2mmol sodium trifluoroacetate (CF 3 COONa), 8mL oleic acid, 8mL oleylamine and 12mL of octadecene, stir to obtain a mixed solution;

[0086] (3) Heat the mixed solution to 120°C, and blow argon into the mixed solution for 30 minutes under an argon atmosphere...

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Abstract

The invention discloses a non-contact ultra-low temperature sensing up-conversion nanoprobe and a preparation method and application thereof, and relates to a temperature sensing up-conversion nanoprobe and a preparation method and application thereof. The invention aims to solve the technical problems that the existing rare earth doped up-conversion fluorescent probe for temperature sensing is not suitable for being used in an ultralow temperature interval of less than 120K and is low in sensitivity. According to the probe, alpha-NaYF4 nanocrystalline serves as an inner core, NaYxF4: Yby <3+>/Tm1xy <3+> serves as a middle layer, and CaF2 or NaYF4 serves as an outer layer. The preparation method comprises the following steps: 1, preparing an alphaNaYF4 nanocrystalline core, 2, preparing anintermediate layer, and 3, preparing a CaF2 outer layer or a NaYF4 outer layer. When the sensor is used for temperature detection, a standard curve method is adopted to realize ultra-low temperaturehigh-sensitivity detection in a wide temperature interval of 10K-300K. The method can be used in the field of micro-nano scale non-contact optical temperature sensing.

Description

technical field [0001] The invention relates to a non-contact temperature sensing up-conversion nanometer probe, a preparation method and an application thereof. Background technique [0002] The precise measurement of temperature is particularly important for scientific research. However, the inevitable physical contact and heat conduction of traditional thermometers based on thermocouples / thermal resistances severely limit their applications on the micro / nano scale. Meanwhile, fluorescence ratiometers based on thermally coupled / non-thermally coupled energy levels, and non-contact temperature sensors based on temperature-dependent changes in characteristics such as emission peak wavelength, intensity, and fluorescence lifetime have performed well in overcoming the limitations of traditional thermometers. In particular, the optical temperature probe based on the ratio of the fluorescence intensity of the thermally coupled energy level integrates the emission peak intensity c...

Claims

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Application Information

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IPC IPC(8): C09K11/85G01K11/20
CPCC09K11/7773G01K11/20
Inventor 尚云飞郝树伟杨春晖陈童王杨周
Owner HARBIN INST OF TECH
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