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Treatment method for gold nanoparticles protected by organic functional group

A technology of gold nanoparticles and organic functional groups, which is applied in the field of nanomaterials, can solve the problems of inapplicable excision, etc., and achieve the effects of improved catalytic activity, wide selection range, and simple operation steps

Inactive Publication Date: 2017-06-09
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is not suitable for removing strong covalent bonds like Au-S

Method used

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  • Treatment method for gold nanoparticles protected by organic functional group
  • Treatment method for gold nanoparticles protected by organic functional group
  • Treatment method for gold nanoparticles protected by organic functional group

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: Au 25 (SR) 18 Synthesis

[0028] Weigh 60 mg of HAuCl 4 4H 2 O was added to a 50mL three-necked flask, and 15mL THF was added, and the solution was golden yellow. Add TOAB 92 mg (TOAB: Au = 1.16 mol: 1 mol), and the solution gradually turns from golden yellow to orange red. After stirring for 30min, add PhCH 2 CH 2 SH 97μL (PhCH 2 CH 2 SH: Au=5mol:1mol), when the color of the solution gradually becomes lighter to colorless, add NaBH 4 (4mL ice water) 55mg (NaBH 4 : Au=10mol:1mol). Stir for three hours to stop the reaction. Wash the product with n-hexane and methanol, dissolve the precipitate with dichloromethane, remove insoluble matter, and obtain Au after drying 25 (SR) 18 .

[0029] Such as figure 1 It is a transmission electron microscope picture of the gold nanocluster prepared in Example 1, and the diameter of the gold particle is about 1.5 nm.

Embodiment 2

[0030] Example 2: Au 25 (SR) 18 Ammonia

[0031] At room temperature, add equal volumes of dichloromethane and methanol into the sample vial to dissolve 1mg of Au in 1mL 25 (SR) 18 , and then add 5 μL of ammonia water (NH 3 ·H 2 O, mass percent concentration is 25%), obtains the sample before processing.

[0032] Such as figure 2 The spectrogram below is the Au that only adds ammoniacal liquor in embodiment 2 25 (SR) 18 mass spectrum. It can be seen from the figure that it corresponds to Au 25 (SR) 18 The mass-to-core ratio (m / z: 7394.3) and its fragment mass-to-core ratio (m / z: 6058.1).

Embodiment 3

[0033] Embodiment 3: sample uses Co(OAc) 2 deal with

[0034] Add 1mL equal volumes of dichloromethane and methanol into the vial to dissolve 1mg of Au 25 (SR) 18 , add 5 μL ammonia water (NH 3 ·H 2 O, the mass percent concentration is 25%), and then add 0.14 μmol of Co(OAc) 2 (Co 2+ : Au 25 (SR) 18 =2:1), stirred at room temperature for 10 h.

[0035] Such as figure 2The above spectrogram in the middle is that sample uses Co(OAc) in embodiment 3 2 The processed mass spectrum. It can be seen from the figure that it corresponds to Au 24 (SR) 17 The mass-to-core ratio is 7060.3. This peak does not appear in the figure below, proving that Au 24 (SR) 17 It did not appear in the mass spectrometry test, but Co(OAc) 2 processing results.

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Abstract

The invention discloses a treatment method for gold nanoparticles protected by an organic functional group. According to the method, a stabilizer ligand on the surface of the gold nanoparticles can be easily and efficiently treated, so as to supply unsaturated ligating atoms and improve the catalysis activity of the gold nanoparticles. The method mainly comprises: adding Lewis acid into the gold nanoparticles, supplying a lone electron pair under the synergistic action of alkali, and treating the stabilizer ligand on the gold surface at room temperature. Changes of an absorption peak due to the addition of the Lewis acid can be intuitively observed in an ultraviolet-visible absorption spectrum chart, and the changes are matched with results on a mass spectrum.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, in particular to a new method for removing organic ligands on the surface of gold nanoparticles. Background technique [0002] In recent years, the unique optical, electrical, and catalytic properties of noble metal nanomaterials and their applications in new energy research, photoelectric information storage, and biomedicine have attracted extensive attention in related research fields. Liquid phase-based chemical methods are widely used in the preparation of noble metal nanoparticles: a certain template compound and noble metal precursor are reduced by a specific reducing agent, and under the stability and protection of the template compound, the noble metal ions are gradually reduced to noble metal nanoparticles. . These stabilizer ligands play an important role in preventing the irreversible aggregation of interactions between noble metal atoms during the synthesis process. Howe...

Claims

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Application Information

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IPC IPC(8): B22F1/00B01J31/22C07F19/00C07F1/12B82Y40/00
Inventor 李杲李志敏王锦
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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