Icosidodecahedron gold nanocrystal and controllable preparation method thereof

A technology of gold nano-hedra, which is applied in the field of docosahedral gold nano-crystals and their controllable preparation, can solve the problems of limited shape reserve and complex preparation process of ultra-polyhedral gold nano-crystals, and achieve good monodispersity and particle size. Uniform size distribution, easy and efficient operation

Active Publication Date: 2017-02-15
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved in the present invention is that, in consideration of the existing high-facet ultra-polyhedral gold nanocrystals with limited morphology reserve and complex preparation process, a unique new structure of dodecahedral gold nanocrystals is proposed, The gold nano dodecahedron is composed of 8 hexagonal faces with low crystal faces and 24 pentagonal faces with high crystal faces

Method used

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  • Icosidodecahedron gold nanocrystal and controllable preparation method thereof
  • Icosidodecahedron gold nanocrystal and controllable preparation method thereof
  • Icosidodecahedron gold nanocrystal and controllable preparation method thereof

Examples

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Embodiment 1

[0027] Example 1. Controllable preparation process of thirty-two-sided gold nanocrystals of the present invention

[0028] It includes the following steps:

[0029] 1. At room temperature, combine polydiallyl dimethyl ammonium chloride PDDA (average molecular weight of 450,000 Da) with gold chloride HAuCl 4 (Purity> 98%) According to the molar ratio of 50:1, evenly mix and prepare 5mL EG solution, so that HAuCl 4 The concentration is 20mM;

[0030] 2. Combine PDDA with HAuCl 4 Add the EG mixture containing 30mL pentanediol PD to the round bottom simmer, stir and seal;

[0031] 3. Put the entire reaction flask into an oil bath at 216°C and reflux for 2h;

[0032] 4. After the reaction time expires, cool down at room temperature;

[0033] 5. After the temperature of the reaction flask drops to room temperature, pour out the reaction solution and purify it in a high-speed centrifuge at 12000 rpm for 30 minutes

[0034] The supernatant liquid is removed, and the brown-yellow centrifugal preci...

Embodiment 2

[0036] Example 2. Controllable preparation process of thirty-two-sided gold nanocrystals with different particle sizes

[0037] Refer to Example 1 for other implementation conditions and steps. In the above embodiments, the reaction temperature was adjusted to 195°C and 252°C, respectively, to obtain thirty-two-sided gold nanocrystals of different particle sizes, such as figure 2 , As shown in 3. among them figure 2 (a), figure 2 (b) The SEM image and UV-Vis absorption spectrum of large-size thirty-two-sided gold nanocrystals, respectively, image 3 (a), image 3 (b) The SEM image and UV-Vis absorption spectrum of the small-sized thirty-two-sided gold nanocrystals respectively. It can be seen that the size of the thirty-two-sided gold nanocrystals generated by the decrease of the reaction temperature becomes larger, and the average size increases to about 120nm , The absorption peak has a red shift; the particle size generated by the increase of the reaction temperature become...

Embodiment 3

[0038] Example 3 Controllable preparation process of a large number of octahedral gold nanocrystals

[0039] Refer to Example 1 for other implementation conditions and steps. In the above embodiment, the reaction time is shortened to 1 min, and a large number of octahedral gold nanocrystals can be directly obtained, such as Figure 4 As shown, the resonance absorption peak is located at 600nm. among them Figure 4 (a), Figure 4 (b) SEM images and UV-Vis absorption spectra of a large number of octahedral gold nanocrystals, respectively.

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Abstract

The invention discloses icosidodecahedron gold nanocrystal and a controllable preparation method thereof; the icosidodecahedron is composed of 8 low-crystal-face hexagonal sides and 24 high-crystal-face pentagonal sides, and each hexagonal side is provided with 6 pentagonal sides around; the controllable preparation method comprises: subjecting gold chloride (HAuCl4) to direct synthesis by one-step reduction of high-temperature reflux reduction method, with the cationic surfactant diallyldimethylammonium chloride (PDDA) as a protectant and morphological guide agent, and ethylene glycol (EG)/pentanediol (PD) as a solvent and reducing agent. The agents used herein are simple, easy to obtain, and green, the preparation method is simple and efficient and is highly repeatable, the yield of the prepared icosidodecahedron gold nanocrystal is higher than 95%, and the prepared icosidodecahedron gold nanocrystal has regular and unique morphology, good monodispersity and uniformly distributed particle size. The icosidodecahedron gold nanocrystal and the preparation method thereof are of important application value to the mass synthesis of multifaceted gold nanocrystal, and of important guide significance to the controllable synthetic preparation of other polyhedral noble metal nanocrystals.

Description

Technical field [0001] The invention relates to the field of synthesis and preparation of precious metal nanomaterials, in particular to a thirty-two-sided gold nanocrystal and a controllable preparation method thereof. Background technique [0002] Precious metal nanomaterials, especially gold nanocrystals with specific morphologies, have become researchers due to their excellent physical and chemical properties and potential application value in the fields of new energy development, industrial catalysis, nano-optoelectronics, and biomedicine. Objects of widespread concern. Up to now, there have been a large number of preparation methods to synthesize gold nanocrystals with different morphologies, sizes and composition structures. However, in general, these gold nanocrystals are mostly just some conventional forms, such as spherical, cubic, octahedral, rod-like, etc. , Its usual outer surface is a uniform low-index crystal plane, which is easy to synthesize. In particular, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/66C30B29/02C30B7/14B22F9/24B22F1/00B82Y30/00B82Y40/00
CPCC30B7/14C30B29/02C30B29/66B82Y30/00B82Y40/00B22F9/24B22F1/07
Inventor 张海斌卢永刚刘红方敬忠
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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