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Preparation method of gold nanorods with different length-diameter ratios

A gold nanorod, aspect ratio technology, applied in nanotechnology, nanotechnology, metal processing equipment, etc., can solve the problems of difficult to achieve precise control of different aspect ratios, low purity of GNRs, and cumbersome feeding ratio. The effect of inhibiting side growth, uniform morphology and wide control range

Inactive Publication Date: 2017-07-28
SHANGHAI INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the ratio of the ingredients in the preparation process is relatively cumbersome, and the commonly used reducing agent ascorbic acid has strong reducibility, so it is difficult to achieve precise control of different aspect ratios, thus affecting the simple and controllable preparation of GNRs with different aspect ratios. The centrifugation process is simple, and the purity of the obtained GNRs is not high. Therefore, it is of great practical significance to develop methods for the preparation of GNRs with different aspect ratios and the purification of multi-scale GNRs with a single feed ratio.

Method used

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  • Preparation method of gold nanorods with different length-diameter ratios
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  • Preparation method of gold nanorods with different length-diameter ratios

Examples

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Embodiment 1

[0026] (1) Preparation of gold seed solution

[0027] At room temperature (25°C), weigh 1 g tetrachloroauric acid and dissolve it in a 100 mL volumetric flask, and dilute to 10 mg / mL with double distilled water. Weigh 355mg of octadecyltrimethylammonium bromide and dissolve it in 9.75mL of water to form a 0.1mol / L aqueous solution, stir evenly until transparent, add dropwise 100μL of tetrachloroauric acid aqueous solution, and after it is uniformly dispersed in the solution, quickly Add freshly prepared ice bath 0.01mol / LNaBH 4 The solution was 0.6mL, the solution changed from light yellow to brownish yellow, stirred evenly for 3min, and stood at room temperature for 2h before use. At this time, the concentration of gold seeds was 0.25mmol / L.

[0028] (2) Preparation of gold nanorods

[0029] At room temperature (25°C), weigh 365mg of octadecyltrimethylammonium bromide and dissolve it in 10mL of water to form a 0.1mol / L aqueous solution, stir evenly until transparent, then ...

Embodiment 2

[0035] (1) Preparation of gold nanorods modified p-mercaptoaniline solutions with different aspect ratios

[0036] Weigh 125mg and dissolve in 1ml double-distilled water to prepare 1mol / L p-mercaptoaniline, and dilute 10 3 times, the final concentration was 1 mmol / L p-mercaptoaniline. According to the literature "Determination of Size and Concentration of Gold Nanoparticles from UV-Vis Spectra" (Wolfgang Haiss et.al., Analytical Chemistry, 2007, 79, 4215-4221), the molar absorptivity of prepared gold nanorods with different aspect ratios was compared , combined with the absorbance of the ultraviolet spectrum, according to the Lambert-Beer law, the final concentration of the gold nanorod sol with different aspect ratios was calculated respectively. According to the difference in concentration, add quantitative water to achieve a consistent concentration. Then 50 μL of gold nanorods were taken and incubated with 50 μL of 1 mM p-mercaptoaniline to prepare the gold nanorods modi...

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Abstract

The invention discloses a preparation method of gold nanorods with different length-diameter ratios. The preparation method comprises the following specific steps that 1, a sodium borohydride reducing agent is added into a mixed solution composed of stearyl trimethyl ammoium bromide and chloroauric acid for reacting, and a gold nanoseed solution is prepared; 2, after a stearyl trimethyl ammoium bromide solution, a chloroauric acid solution and a silver nitrate solution are mixed, a glucose solution is added, the gold nanoseed solution obtained in the step 1 is poured into the mixed solution, and the gold nanorods with different length-diameter ratios are prepared by singly regulating and controlling the adding amount of silver nitrate; 3, centrifugal separation is conducted through a temperature difference centrifugation method, and gold nanorod sol is obtained. According to the preparation method, operation is easy, and the regulating and controlling range is wide; the obtained gold nanorods with different length-diameter ratios have the advantages of being good in dispersibility and uniform in particle size and can be widely applied to the fields of biosensing, surface-enhanced Raman scattering and the like.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a preparation method of gold nanorods with different aspect ratios. Background technique [0002] As one of the noble metal (gold, silver, cobalt) nanomaterials family, gold nanorods (GNRs) have been a research hotspot in recent years. Since gold nanorods have two surface plasmon resonance absorption peaks: the plasmon absorption peak (TSPR) on the horizontal axis and the plasmon absorption peak (LSPR) on the vertical axis, where TSPR changes little with the aspect ratio of the nanorods, However, LSPR is sensitive to changes in the aspect ratio of nanorods. According to the peak position of LSPR, the size of nanorods can be monitored in real time. At the same time, gold nanorods with different aspect ratios show different surface-enhanced Raman spectroscopy (SERS) activities due to differences in surface plasmon resonance properties. In addition, go...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/00B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00B22F9/24B22F1/07B22F1/054
Inventor 李丹邓维马亚丹段化珍
Owner SHANGHAI INSTITUTE OF TECHNOLOGY
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