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Gold nanorod and preparing method thereof

A gold nanorod and gold seed technology, which is applied in the field of gold nanorod preparation, can solve the problems of poor size monodispersity and complicated operation of gold nanorods, and achieves good size monodispersity, simple operation steps and repeatability. high effect

Inactive Publication Date: 2015-04-08
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of complex operation and poor monodispersity of gold nanorod size in the prior art, and provide a kind of gold nanorod and its preparation method

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  • Gold nanorod and preparing method thereof
  • Gold nanorod and preparing method thereof
  • Gold nanorod and preparing method thereof

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preparation example Construction

[0016] The preparation method of the gold nanorod provided by the present invention comprises mixing the gold nanorod growth solution and the gold seed crystal, and placing the mixed obtained mixture under the condition of the gold seed crystal growth so that the gold seed crystal grows, and the gold nanorod growth solution contains a surface Active agent, reducing agent, tetrachloroauric acid and soluble silver salt, characterized in that the gold nanorod growth solution also contains soluble copper salt, relative to each mole of gold seed, the amount of soluble copper salt added is 16-400mol , preferably 50-267mol.

[0017] The inventors of the present invention found that when the added soluble copper salt is within the above preferred range, the reaction rate can be significantly accelerated while improving the quality of gold nanorods, thereby further improving the size monodispersity of gold nanorods.

[0018] Wherein, the purpose of the present invention can be realized...

Embodiment 1

[0032] Take 100mL concentration of 0.1M cetyltrimethylammonium bromide aqueous solution, add 1.1mL concentration of 45.4mM tetrachloroauric acid aqueous solution, 0.4mL concentration of 10mM silver nitrate solution, 1.6mL concentration of 10mM Aqueous solution of copper chloride, 2mL aqueous solution of sulfuric acid with a concentration of 0.5M, after mixing evenly, then add 800 μL aqueous solution of ascorbic acid with a concentration of 0.1M, the resulting mixed solution becomes colorless, and then add 240 μL of gold seeds prepared by the above steps solution, after mixing evenly, a 30° C. constant temperature water bath was used for 12 hours to obtain a gold nanorod solution. Determination of the ultraviolet-visible-near-infrared absorption spectrum characteristic parameters of the gold nanorod solution, the measurement results are as follows figure 1 Shown in a and Table 1; observe the transmission electron microscope image of gold nanorods, as figure 2 Shown in A.

Embodiment 2-4

[0034] Prepare gold nanorod solution according to the method for embodiment 1, difference is that " 0.4mL concentration is the silver nitrate aqueous solution of 10mM and 1.6mL concentration is the cupric chloride aqueous solution of 10mM " by " 0.7mL concentration is the silver nitrate aqueous solution of 10mM, 1mL of 10mM copper chloride aqueous solution", "1mL of 10mM silver nitrate aqueous solution, 0.6mL of 10mM copper chloride aqueous solution" and "1.5mL of 10mM silver nitrate aqueous solution, 0.3mL of 10mM Copper chloride aqueous solution" instead. Determination of the ultraviolet-visible-near-infrared absorption spectrum characteristic parameter determination result of gold nanorod solution is as follows figure 1 Shown in b-d and Table 1; observe the transmission electron microscope image of gold nanorods, such as figure 2 are shown in B-D.

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Abstract

The invention provides a preparing method of a gold nanorod. The preparing method of the gold nanorod is characterized in that a growth solution of the gold nanorod further contains soluble copper salt, and the added quantity, relative to each mole of gold seed crystal, of the soluble copper salt is 16-400 moles. The length-diameter ratio of the gold nanorod obtained through the method is in a range of 2.3 + / - 0.3 to 3.7 + / - 0.4, the value of full wave at half maximum (FWHM) of an absorption peak of a longitudinal surface plasmon resonance is 0.20-0.22eV, and the ratio of absorbance of absorption peak positions of the longitudinal surface plasmon resonance and a transverse surface plasmon resonance (ALSPR / ATSPR) is 2.3 to 4.9. According to the preparing method of the gold nanorod, cupric ions are used for the first time to catalyze forming of the gold nanorod of high quality. The preparing method of the gold nanorod is simple in operating step, monodispersity of the size of the obtained gold nanorod is good, and performance of the gold nanorod is obviously improved. In addition, the preparing method of the gold nanorod is high in repeatability and moderate in reaction condition, and a used reagent is cheap and nontoxic.

Description

technical field [0001] The invention relates to a preparation method of gold nanorods and gold nanorods prepared by the method. Background technique [0002] At present, there are three main methods for preparing gold nanorods by wet chemistry, among which the most widely used method is the seed-mediated growth method (Seed-mediated Growth) proposed by Murphy et al. Seed crystal concentration, surfactant type, etc. to obtain gold nanorods with different shapes and sizes. Ag + Auxiliary seed growth method to synthesize gold nanorods with different aspect ratios. Ag + The addition of can significantly increase the yield of gold nanorods and realize the regulation of the aspect ratio of gold nanorods within a certain range. Zhu et al. (Jing Zhu, Ken-Tye Yong, Indrajit Roy, Rui Hu, Hong Ding, Lingling Zhao, Mark T Swihart, Guang S He, Yiping Cuiand Paras N Prasad, “Additive controlled synthesis of gold nanorods (GNRs) for two- photon luminescence imaging of cancer cells." N...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/02C30B29/64C30B7/14B82Y40/00B82Y30/00
Inventor 温涛刘文奇吴晓春
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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