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Method for dispersing, purifying and/or assembling nano gold rods

A kind of nano-gold rod and dispersion technology, which can be used in devices for coating liquid on surfaces, special surfaces, coatings, etc., which can solve the problems of low purification efficiency, harsh conditions, high time and economic cost, and achieve high purification yield and reaction. The effect of mild conditions and simple reaction

Active Publication Date: 2012-10-17
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above methods have disadvantages such as harsh conditions, high time and economic costs, and low purification efficiency.

Method used

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  • Method for dispersing, purifying and/or assembling nano gold rods
  • Method for dispersing, purifying and/or assembling nano gold rods
  • Method for dispersing, purifying and/or assembling nano gold rods

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1, utilize surfactant C 18 N 3 The method for dispersing nano gold rods, the steps are as follows:

[0036] The crude product of nano-gold rods was centrifuged and washed three times under the condition of centrifugal force of 450g and 20min / time (see figure 1 (a)), in order to remove excess CTAB during the preparation process, a concentration of 0.5 mM C was added to the centrifuged product 18 N 3 Aqueous solution (1mL), 600W power ultrasonic 30s, get the good dispersion system of nano-gold rods, see figure 1 (c).

[0037] in order to do C 18 N 3 For the comparative experiment of excellent solubility, add the crude nano-gold rod product that was centrifuged and washed to remove excess CTAB into 0.1M CTAB (1mL), and ultrasonicate at 600W power for 30s. It can be observed that the crude nano-gold rod product can only partially dissolve, see figure 1 (b).

[0038] Depend on figure 1 (a) It can be seen that the crude gold nanorods after several times of...

Embodiment 2

[0046] Embodiment 2, utilize surfactant C 18 N 3 The method for purifying nano gold rods, the steps are as follows:

[0047] To Example 1 obtained with C 18 N 3 Dispersed nano gold rod system (in C 18 N 3 The concentration is 1mM as an example), and NaOH standard solution (0.5M, 15μL) was added to it to adjust its pH from 8.2 to 11.0. Colored (nanospheres and nanosheets suspended in it). Absorb the supernatant, add 2 mL of water 60 times the volume of the sediment to the lower layer, and ultrasonically disperse, wash 2 mL of the water-dispersed nano gold rod solution under the condition of a centrifugal force of 450 g and 20 min / time to eliminate the purification process. NaOH in and excess surfactant C 18 N 3 , the centrifuged product is the purified gold nanorods. See figure 2 (b). It can be seen from the figure that the purified gold nanorods ( figure 2 (b)) Compared with the gold nanorods before purification ( figure 2 (a) Most of the by-products, such as n...

Embodiment 3

[0048] Embodiment 3, utilize surfactant C 18 N 3 The method for assembling nano gold rods, the steps are as follows:

[0049] Add an equal volume of an aqueous solution of di(aminoethylacylmethylethyl)octadecylamine (0.1mM, 1mL) to the product obtained in Example 2, mix well, and then add a standard solution of HCl (0.5M, 20μL). After the pH was adjusted from 8.3 to 4.0, 1 mL of water was added again, and then centrifuged and washed once under the condition of centrifugal force of 450 g and 20 min / time to remove NaCl generated in the purification and subsequent processes, as well as excess acid-base regulator and surfactant C 18 N 3 , and then add 100 μL of water to the centrifuged product, after ultrasonic dispersion, take 2-5 μL and spot it on the silicon wafer, and dry it naturally with a cover above at 16°C. Figure 4 It can be seen that the gold nanorods are assembled in a large area.

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Abstract

The invention discloses a method for dispersing, purifying and / or assembling nano gold rods. According to the method, 'dendritic' surfactant C18N3 with acid and alkali response is used as a protective agent, and a good dispersion system of the nano gold rods can be obtained under low surfactant concentration. At normal temperature, the system is regulated to alkali through standard NaOH, so that the settling rates of the nano gold rods and other nano particles in the system are different and the nano gold rods are purified; and the pH of the purified nano gold rod system is regulated through HCl, so that a large-area assembly of the nano gold rods can be obtained. The method is mild in reaction conditions, can be operated at the normal temperature, is easy to operate, short in reaction period, beneficial to reducing time and cost, cheap and readily available in raw materials required by the reaction, high in repeatability and high in purification yield, and reduces the production cost. The reaction is simple and feasible, factors which are difficult to control are eliminated, and artificial control of product yield and assembly area can be well realized.

Description

technical field [0001] The present invention relates to a method for dispersing, purifying and / or assembling nano gold rods. Background technique [0002] In recent years, with the widespread application of nanostructured materials in high-tech fields, the preparation and assembly of noble metal nanomaterials with unique properties in optics, electricity, acoustics, magnetism, and mechanics has attracted intense interest. Some anisotropic noble metal nanomaterials, such as rod-like, filamentous, sheet-like and tubular nanomaterials, have attracted people's attention due to their obvious differences in optical and electrical properties from isotropic nanomaterials such as spherical nanomaterials. . Because of the size and shape dependence of the unusual optical, electrical, and magnetic properties of noble metal nanomaterials, it is very important to finely control their morphology, and morphological anisotropy can lead to very complex physical properties and self-assembly b...

Claims

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Application Information

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IPC IPC(8): B22F1/00B05D1/00B05D5/00
Inventor 江龙武俊文鲁闻生贾文峰
Owner INST OF CHEM CHINESE ACAD OF SCI
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