Water-soluble copper nano fluorescent probe as well as preparation method and application thereof

A fluorescent probe and copper nanotechnology, applied in nano optics, nanotechnology, nanotechnology, etc., can solve the problems of transition metal ion interference, cumbersome synthesis procedures, long response time, etc., and achieve fast reaction speed and controllable reaction conditions , the effect of high sensitivity

Active Publication Date: 2019-05-28
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the previously reported chemical sensors for this purpose suffer from many deficiencies, such as poor detection limits, cumbersome synthesis procedures, interference from other transition metal ions, long response time, and the use of organic solvents.

Method used

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  • Water-soluble copper nano fluorescent probe as well as preparation method and application thereof
  • Water-soluble copper nano fluorescent probe as well as preparation method and application thereof
  • Water-soluble copper nano fluorescent probe as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: 200 μL of 10 mmol / L copper nitrate solution and 200 μL of 0.01 mol / L N-acetyl-L-cysteine ​​aqueous solution were mixed and shaken, and the pH was adjusted to 4.00 with 1 mol / L NaOH. The reaction mixture was sonicated at a power of 70W for 5min to obtain fluorescent copper nanoclusters. The fluorescence emission peak of the copper nanocluster is around 620 nm, and when observed with a black background under an ultraviolet lamp, it exhibits red fluorescence with a quantum yield of 0.15%.

Embodiment 2

[0016] Example 2: 200 μL of 30 mmol / L copper nitrate solution and 1000 μL of 0.02 mol / L N-acetyl-L-cysteine ​​aqueous solution were mixed and shaken, and the pH was adjusted to 5.00 with 1 mol / L NaOH. The reaction mixture was sonicated at a power of 170W for 10min to obtain fluorescent copper nanoclusters. The fluorescence emission peak of the copper nanocluster is around 620 nm, and when observed with a black background under an ultraviolet lamp, it exhibits red fluorescence with a quantum yield of 0.18%.

Embodiment 3

[0017] Example 3: 200 μL of 40 mmol / L copper nitrate solution and 2000 μL of 0.04 mol / L N-acetyl-L-cysteine ​​aqueous solution were mixed and shaken, and the pH was adjusted to 6.50 with 1 mol / L NaOH. The reaction mixture was sonicated at a power of 170W for 15min to obtain fluorescent copper nanoclusters. The fluorescence emission peak of the copper nanocluster is around 620 nm, and when observed with a black background under an ultraviolet lamp, it exhibits red fluorescence with a quantum yield of 0.44%.

[0018] The maximum fluorescence excitation and emission peaks of the copper nanoclusters are around 338 nm and 620 nm, respectively. Under ultraviolet light, when observed with a black background, it presents red fluorescence with a quantum yield of 0.44%, as shown in figure 1 shown. Add the copper nanocluster stock solution (100 μL) and 1 mL of phosphate buffer solution (PBS, pH= 6.5 0.03 mol / L) into the fluorescence cuvette, and measure its ultraviolet absorption spectr...

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Abstract

The invention belongs to the technical field of fluorescent nano-materials and provides a red fluorescent copper nano-cluster and a preparation method thereof, which have the advantages of simplicityin operation, moderate conditions and the quantum yield of 0.44 percent. A synthesis method of the prepared red fluorescent copper nano-cluster is simple, and interference caused by self fluorescent light of living organisms can be avoided; the red fluorescent copper nano-cluster has high sensitivity on Ag<+> ions and can be used for constructing a sensing system for detecting the Ag<+> ions. At room temperature, N-acetyl-L-cysteine is used as a protection agent and a reduction agent and a copper nitrate solution is used as a matrix to prepare a fluorescent copper nano-cluster solution throughan ultrasonic method. The addition of a common reduction agent, i.e., sodium borohydride, ascorbic acid, a surfactant and the like is avoided; the preparation method is simple to operate and feasible, has moderate conditions and is environmentally friendly; the prepared copper nano-cluster has good water solubility, high quantum yield and low toxicity, and can be used for highly sensitively and highly selectively identifying and detecting the Ag<+> ions; a detection process is simple and rapid and a detection result is accurate.

Description

technical field [0001] The invention belongs to the technical field of fluorescent nanomaterials, in particular to a water-soluble copper nano fluorescent probe and its preparation method and application, especially in Ag + Applications in ion detection. Background technique [0002] Synthesis of nanoclusters by sonication is an effective method for forming nanoparticles because ultrasound generates high-intensity sound waves through a unique reaction process of formation, growth, and implosion-collapse of bubbles in solution. Such processes generate localized hot spots of transient high temperature and pressure through adiabatic compression or shock waves. This environment can provide a growth platform for energy-rich and fast-kinetic substances to promote chemical reactions. The advantages of sonochemistry include four aspects: (1) easy to operate, green and harmless; (2) fast reaction speed; (3) controllable reaction conditions; (4) ability to prepare nanoparticles with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/58B82Y20/00B82Y40/00G01N21/64B22F9/24
Inventor 张彦张雨婷高鹏飞李天栋张国梅董川
Owner SHANXI UNIV
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