Flower-like palladium oxide-gold nano composite material and preparation method as well as application thereof

A composite material, palladium oxide technology, applied in the field of nanomaterials, can solve the problems of no bimetallic nanomaterial synthesis and application reports, and achieve the effects of easy operation, enhanced SERS activity, and simple process

Pending Publication Date: 2020-09-15
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The technologies involved are all improvements in the synthesis method, not to mention the

Method used

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  • Flower-like palladium oxide-gold nano composite material and preparation method as well as application thereof
  • Flower-like palladium oxide-gold nano composite material and preparation method as well as application thereof
  • Flower-like palladium oxide-gold nano composite material and preparation method as well as application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Add 16 mg of Pd(acac) sequentially to 10 mL of N,N-dimethylformamide (DMF) 2 , 1 mg of citric acid, 60 mg of cetyltrimethylammonium bromide (CTAB), and 20 mg of polyvinylpyrrolidone (PVP) were mixed and stirred for 1 h to obtain an orange-red liquid.

[0040] Then transfer to a 25mL flask and add 100mg of tungsten hexacarbonyl (W(CO) 6 ) heated and stirred at 80 degrees Celsius in an argon atmosphere for 1 hour to obtain blue hexagonal palladium nanosheets, such as figure 1 As shown in figure a.

[0041] The volume ratio of acetone and ethanol is 8:2 to purify palladium.

[0042] Dissolve the purified palladium in 2mL of ultrapure water to obtain a palladium nano-solution of 1mg / mL, take 500 μL of palladium nano-solution and 250 μL of 5mM chloroauric acid HAuCl 4 Stir for 5 minutes to obtain flower-shaped palladium nanogold.

[0043] The characterization of the nanomaterials prepared in this example can be seen Figure 1-3 .

[0044] figure 1 Figures of each prod...

Embodiment 2

[0051] Add 26 mg of Pd(acac) sequentially to 15 mL of N,N-dimethylformamide (DMF) 2 , 5 mg of citric acid, 90 mg of cetyltrimethylammonium bromide (CTAB), and 40 mg of polyvinylpyrrolidone (PVP) were mixed and stirred for 1 h to obtain an orange-red liquid.

[0052] Then transfer to a 25mL flask and add 120mg of tungsten hexacarbonyl (W(CO) 6 ) was heated and stirred at 100 degrees Celsius in an argon atmosphere for 0.5 hour to obtain blue hexagonal palladium nanosheets.

[0053] The volume ratio of acetone and ethanol is 1:0.3 to purify palladium, wherein ethanol is 95% ethanol by volume.

[0054] Dissolve the purified palladium in 2mL of ultrapure water to obtain a palladium nano-solution with a concentration of about 1mg / mL. Take 500 μL of palladium nano-solution and 150 μL of 5mM chloroauric acid HAuCl 4 Stir for 8 minutes to obtain flower-shaped palladium gold nanoparticles.

Embodiment 3

[0056] Add 20 mg of Pd(acac) sequentially to 5 mL of N,N-dimethylformamide (DMF) 2 , 10 mg of citric acid, 50 mg of cetyltrimethylammonium bromide (CTAB), and 30 mg of polyvinylpyrrolidone (PVP) were mixed and stirred for 1 hour to obtain an orange-red liquid.

[0057] Then transfer to a 25mL flask and add 100mg of tungsten hexacarbonyl (W(CO) 6 ) was heated and stirred at 80 degrees Celsius in an argon atmosphere for 1 hour to obtain blue hexagonal palladium nanosheets.

[0058] The volume ratio of acetone and ethanol is 1:0.1 to purify palladium, wherein ethanol is 95% ethanol by volume.

[0059] Dissolve the purified palladium in 2mL of ultrapure water to obtain a palladium nano-solution with a concentration of about 1mg / mL. Take 500 μL of palladium nano-solution and 100 μL of 5mM chloroauric acid HAuCl 4 Stir for 15 minutes to obtain flower-shaped palladium nanogold.

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Abstract

The invention discloses a synthesis method of a flower-like palladium oxide-gold nano composite material. The synthesis method comprises the following steps of (1) N, N-dimethylformamide, Pd (acac) 2,citric acid, hexadecyl trimethyl ammonium bromide and polyvinylpyrrolidone are selected, and uniformly mixing is conducted to obtain an orange red liquid; (2) tungsten hexacarbonyl is added into theorange red liquid, the temperature is adjusted in an argon atmosphere, and stirring reaction is carried out to obtain a blue hexagonal palladium nanosheet; (3) the blue hexagonal palladium nanosheet is purified by using a mixed solvent of acetone and ethanol to obtain purified palladium; and (4) the purified palladium is dissolved in ultrapure water to obtain a palladium nano solution, and the palladium nano solution and chloroauric acid are stirred and reacted to obtain the flower-like palladium oxide-gold nano composite material. The invention further discloses the flower-like palladium oxide-gold nano composite material synthesized by the method, application of the composite material as an active substrate in surface enhanced Raman scattering and application of the composite material inthe aspect of a photo-thermal effect.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a flower-shaped palladium oxide-gold nanocomposite material and its preparation method and application. Background technique [0002] Metal nanoparticles (NPs) can be widely used in different application fields, and thus become a research hotspot. For example, metal nanoparticles are used in optical and photothermal applications such as sensing due to their efficient interaction with light, including localized surface plasmon resonances (LSPRs) (Adv. Mater. 2012, 24, 4811-4841) , photodata storage (Nature 2009, 459, 410-413)), photocatalysis (Nat. Mater. 2015, 14, 567-576) and optoelectronics (Nat. Mater. 2010, 9, 205-213). The surface plasmon resonance of noble metal nanoparticles depends on their size, shape, composition and structure. Among them, Au / Pd has proven to be an interesting system because it is largely synthetically controlled, allowing tuni...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/02B82Y30/00B82Y40/00F24S70/12G01N21/65
CPCB22F9/24B82Y40/00B82Y30/00G01N21/658F24S70/12B22F1/0553B22F1/17Y02E10/40
Inventor 余海红刘智明郭周义
Owner SOUTH CHINA NORMAL UNIVERSITY
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