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Optical ion sensing film for detecting metal ions, and preparation method and application thereof

A technology of metal ions and sensing membranes, applied in the field of chemical detection, can solve problems such as inability to achieve continuous and repeated detection, and achieve high quantum yield

Inactive Publication Date: 2012-06-13
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, continuous and repeated detection is often not possible in homogeneous phases, but chemical sensors based on upconverting nanomaterials can meet these requirements as long as they are combined with suitable probes.

Method used

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  • Optical ion sensing film for detecting metal ions, and preparation method and application thereof
  • Optical ion sensing film for detecting metal ions, and preparation method and application thereof
  • Optical ion sensing film for detecting metal ions, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1: NaYF 4 : Synthesis of Er, Yb nanorods.

[0040] NaYF 4 :Er,Yb nanorods were synthesized according to the literature 18 .

[0041] The specific steps are as follows: sodium hydroxide (1.2 g, 30 mmol), water (7 mL), ethanol (12 mL) and oleic acid (22 mL) are mixed together and stirred to form a clear solution. Add a total of 1 mmol of rare earth chloride (total 2 mL, 0.5 M, the doping ratio of rare earth ions according to the molar ratio: 78 mol% Y+20 mol% Yb+2 mol% Er) aqueous solution under constant magnetic stirring, and stir evenly. 5 mL of 1 M sodium fluoride solution was added dropwise. The mixed solutions were stirred for about 10 min, transferred to a 50 mL hydrothermal reactor, packaged, and hydrothermally treated at 195 °C for 16 h. After natural cooling, the samples were dissolved and collected with cyclohexane, ethanol was added to precipitate the samples, centrifuged, washed several times with ethanol and water, and then vacuum-dried.

[0042...

Embodiment 2

[0043] Example 2: Preparation of Optical Ion Sensing Membrane for Detecting Calcium Ions.

[0044] Each component was dispensed into a 100 mg mixture in the following weight percentages:

[0045] Chromogenic ionophore ETH5418 0.34%;

[0046] Ion exchanger NaTFPB 0.88%;

[0047] Calcium ionophore AU-1 (according to literature 26 Synthesis) 1.68%;

[0048] Up-conversion nanorods (made in Example 1) 2.17%;

[0049] PVC 31.74%;

[0050] Plasticizer DOS 63.19%.

[0051] The above mixture was dissolved with 1 mL of THF. The obtained solution was shaken vigorously for 0.5h and then sonicated for at least 0.5h to obtain a homogeneous solution. Use a pipette to take 50 μL of the mixed solution and spread it evenly on a clean rectangular quartz plate. Before use, let the solvent evaporate in the dark for 0.5 hours to obtain an optical ion sensing film for detecting calcium ions. The thickness of the film is 5-7 μm. .

[0052] When testing, insert the quartz plate with the optod...

Embodiment 3

[0053] Example 3: Preparation of an optical ion sensing membrane for the detection of sodium ions.

[0054] Each component was dispensed into a 100 mg mixture in the following weight percentages:

[0055] Chromogenic ionophore ETH5418 0.36%;

[0056] Ion exchanger NaTFPB 0.46%;

[0057] Sodium ionophore Na(X) (purchased from Fluka) 0.98%;

[0058] Up-conversion nanorods (made in Example 1) 2.05%;

[0059] PVC 31.96%;

[0060] Plasticizer NPOE 64.19%.

[0061] The above mixture was dissolved with 1 mL of cyclohexanone. The obtained solution was shaken vigorously for 0.5h and then sonicated for at least 0.5h to obtain a homogeneous solution. Use a pipette to take 50 μL of the mixed solution and spread it evenly on the top of the optical fiber. Before use, let the solvent evaporate in the dark for 0.5 hours to obtain an optical ion sensing membrane for detecting sodium ions. The thickness of the membrane is 5-7 μm.

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Abstract

The invention discloses an optical ion sensing film for detecting metal ions. The optical ion sensing film comprises the following components in percentage by weight: 0.34 to 0.38 percent of ETH5418, 0.46 to 0.91 percent of quadri[3,5-bi-( trifluoromethyl)benzene]-sodium-tetraborate, 0.43 to 2.17 percent of metal ion carrier, 2.01 to 2.17 percent of up-conversion nanorod, 31.41 to 32.71 percent of polrvinyl chloride and the balance of bis(2-ethylhexyl)decandeionate or o-npoe 2-nitrophenyl octyl ether or dioctyl phthalate. The invention also discloses a preparation method for the sensing film and application of the sensing film to detection of the metal ions. The sensing film is excited by light with wavelength of 980 nanometers and the light of the sensing film is transmitted in a near infrared region, so that the sensor is not interfered with background absorption and background fluorescence; furthermore, compared with the conventional organic system, the system has higher quantum yield, and can produce high-intensity fluorescence.

Description

technical field [0001] The invention belongs to the technical field of chemical detection, and in particular relates to an optical ion sensing film for detecting metal ions and a preparation method and application thereof. Background technique [0002] The development of ion sensors with high selectivity and sensitivity for biological and environmental detection has attracted widespread interest in recent years. The detection of ions in biological systems plays a key role in the study of signal transmission in organisms, and the detection of highly toxic heavy metals in the environment also promotes the development of ion sensors. Optical sensors based on polymer materials have been applied to the detection of various ions in biological systems and environments, providing a reliable platform for ion sensing 1-7 . Commonly used optodes are used for sensing through changes in ultraviolet absorption or fluorescence intensity, among which fluorescence detection is often used f...

Claims

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Application Information

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IPC IPC(8): G01N21/64
Inventor 秦玉谢亮霞
Owner NANJING UNIV
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