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Method for preparing gold kernel cuprous oxide shell composite nanometer structure, and composite nanometer structure

A composite nanostructure, cuprous oxide shell technology, applied in the field of nanoparticles, can solve the problem that the optical properties of gold nanoparticles and cuprous oxide cannot be changed, the interaction between gold core and cuprous oxide shell cannot be reflected, Large particle size and other problems, to achieve the effect of cheap and non-toxic reagents, high yield, and good size distribution

Active Publication Date: 2014-07-23
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Abstract
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  • Claims
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Problems solved by technology

[0005] However, the above two methods have shortcomings. In the first method, the thickness of the cuprous oxide shell synthesized is between 100-200nm, so the structure uses gold nanoparticles as a shape template to synthesize gold cores of different shapes. Cuprous oxide shell particles, the interaction between the gold core and the cuprous oxide shell is not reflected, and because the particle size is too large, the spectral lines of the UV-Vis-NIR extinction spectrum of the colloidal solution can only show the cuprous oxide particles The scattering of gold nanoparticles and cuprous oxide cannot show the optical properties of gold nanoparticles and cuprous oxide and the changes of optical properties caused by the interaction between the two
In the second method, gold nanosphere particles are used as the core to prepare a gold core cuprous oxide shell structure, and the thickness of the shell layer is between 35-120nm, but compared with gold nanospheres, gold nanorods have more special optical properties. Therefore, the interaction between the gold nanorod core and the cuprous oxide shell will be more obvious, and the reducing agent hydrazine hydrate used in this method is also toxic.

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  • Method for preparing gold kernel cuprous oxide shell composite nanometer structure, and composite nanometer structure
  • Method for preparing gold kernel cuprous oxide shell composite nanometer structure, and composite nanometer structure
  • Method for preparing gold kernel cuprous oxide shell composite nanometer structure, and composite nanometer structure

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Experimental program
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Effect test

Embodiment 1

[0042] To the cetyltrimethylammonium bromide aqueous solution with a concentration of 0.033M, 1mM copper chloride aqueous solution, 0.33nM gold nanorods, 7.5mM sodium hydroxide aqueous solution and 3mM ascorbic acid aqueous solution were respectively added to the final concentration. The mixed solution was placed in a 30°C water bath for 22 minutes to obtain a gold core cuprous oxide shell structure. After adding ascorbic acid, the solution changed from reddish brown to purple red and finally grayish green in about 10 seconds. After 25 minutes, the solution was taken out and centrifuged at 8000 rpm for 3 minutes to obtain gold nanorod core cuprous oxide shell particles.

[0043] Then add 4-ATP solution, let stand for 3 hours, centrifuge several times, and then perform Raman experiment. Pure cuprous oxide particles were obtained without adding gold nanorods according to the above method, and the band gaps of the composite nanostructure particles and cuprous oxide particles were...

Embodiment 2-5

[0045] Embodiment 2-5: the influence of sodium hydroxide concentration

[0046] Gold core cuprous oxide shell structures were prepared according to the method of Example 1, except that aqueous sodium hydroxide solutions with final concentrations of 5mM, 7.5mM, 10mM, 15mM, 20mM and 25mM were added respectively. Determination of the relationship between the characteristic parameters of the ultraviolet-visible-near-infrared extinction spectrum of the gold nanorod solution and the peak value of the long-wave surface plasmon resonance absorption peak and the concentration of sodium hydroxide, the measurement results are as follows Figure 4 (a) and Figure 4 Shown in (b); SEM images of observed structures, such as Figure 5 shown.

[0047] When the amount of sodium hydroxide added is less than 15mM, sodium hydroxide cannot put all Cu 2+ Converted into copper hydroxide, so the final cuprous oxide shell layer is very thin, and the amount of red shift of the corresponding long-wave...

Embodiment 6-9

[0048] Examples 6-9: Effect of Surfactant Concentration

[0049] The gold core cuprous oxide shell structure was prepared according to the method of Example 1, except that the surfactant hexadecyltrimethylammonium bromide with a final concentration of 0.01M, 0.033M, 0.06M and 0.09M was added respectively . Determination of the ultraviolet-visible-near-infrared extinction spectrum characteristic parameter determination result of gold core cuprous oxide shell structure solution is as follows Figure 6 As shown in (a), the relationship between the peak value of the long-wave surface plasmon resonance absorption peak and the concentration of cetyltrimethylammonium bromide is as follows Figure 6As shown in (b); the scanning electron microscope image for observing the structure of the gold core cuprous oxide shell is as follows Figure 7 .

[0050] As can be seen from Examples 6-9, if the concentration of cetyltrimethylammonium bromide is lower than 30mM, the obtained cuprous ox...

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Abstract

The invention relates to a method for preparing a gold kernel cuprous oxide shell composite nanometer structure, and the composite nanometer structure. The method includes the steps of preparing a gold nanorod, surface active agents, soluble copper salt, strong base and reducing agents to form a mixed solution, and enabling a cuprous oxide shell to grow on the outer surface of the nanorod, wherein the surface active agents are cetyl trimethyl ammonium bromide, and the reducing agents are ascorbic acid. According to the method, the new surface active agents and the new nontoxic reducing agents are adopted, the cold kernel cuprous oxide shell composite nanometer structure can be prepared under the room temperature, the thickness of the cuprous oxide shell of the composite nanometer structure is smaller than 30 nm, and the cold kernel cuprous oxide shell composite nanometer structure has the optical characteristics of the gold nanorod and has the optical characteristics of the nanometer cuprous oxide as well.

Description

technical field [0001] The invention relates to the technical field of nanoparticles, in particular to a preparation method of a gold core cuprous oxide shell composite nanostructure and the composite nanostructure. Background technique [0002] Cuprous oxide is a p-type semiconductor with a theoretical bandgap of 2.17eV (570nm). It can be excited in the visible range and has unique optical and magnetic properties. Gas detection and photothermal have great application prospects. [0003] At present, there are mainly two methods for preparing gold-core cuprous oxide-shell structures by solution chemistry. One of them is proposed by Micheal H.Huang et al. (Kuo C H, Hua T E, Huang M H.Au Nanocrystal-Directed Growth of Au-Cu 2 O Core-Shell Heterostructures with Precise Morphological Control.J.Am.Chem.Soc.,2009,131:17871-17878) proposed using sodium lauryl sulfate as surfactant, hydroxylamine as reducing agent, in secondary water The final product was obtained after adding sol...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/02B82Y40/00B82Y30/00
Inventor 时晓伟吴晓春
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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