Nano or micron-scale gold disk and preparation method thereof

A gold disk and size technology, applied in the field of disk-shaped gold material and its preparation, to achieve the effect of simple equipment and process and strong operability

Inactive Publication Date: 2009-09-23
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

Although this polyalcohol reduction method has been used to prepare gold nanoparticles and silver nanoparticles, by controlling the reaction parameters and conditions, t

Method used

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  • Nano or micron-scale gold disk and preparation method thereof
  • Nano or micron-scale gold disk and preparation method thereof
  • Nano or micron-scale gold disk and preparation method thereof

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0032] Example 1

[0033] In this embodiment, a twin-crystal triangular gold disk with a large single crystal {111} top and bottom surfaces of microns (side length: 1-10 microns) size is prepared, such as figure 1 b. figure 2 a and image 3 e. image 3 shown in f. There are also a few nano-triangular gold discs (side length: 100-500 nanometers) in the product, such as Figure 4 b. Figure 4 b'is its selected area electron diffraction pattern. There is a twin interface in the middle of the triangular gold plate, and the upper and lower sides are composed of two triangular single crystals; a total of eight {111} type crystal planes are formed, of which there are six sides and one on the top and bottom; the gold plate The surface is covered by polyvinylpyrrolidone polymer.

[0034] The specific preparation method includes the following steps:

[0035] a) Reaction system selection: 3ml of 0.1M chloroauric acid (HuAuCl4·3H2O) and 3ml of 0.1M polyvinylpyrrolidone (PVP) coating agent; ad...

Example Embodiment

[0038] Example 2

[0039] In this embodiment, a hexagonal gold plate is prepared, such as figure 1 a. figure 2 b, and image 3 c. image 3 As shown in d, there is also a twin interface in the middle. The top and bottom surfaces are composed of two hexagonal single crystals, a total of eight {111} type and six {100} type crystal planes; the side surface is composed of Six {111} crystal faces and six {100} crystal faces are arranged alternately. The top and bottom faces each have a {111} crystal face. The surface of the gold plate is wrapped by polyvinylpyrrolidone polymer, and its side length is dimensioned. Reach 1-50 microns. There is also a small amount of hexagonal gold nano disks (side length: 100-500 nanometers) in the product, such as Figure 4 a. Figure 4 a'is its selected area electron diffraction pattern.

[0040] The specific preparation method includes the following steps:

[0041] a) Reaction system selection: take 10ml of 0.6M chloroaurate, such as sodium chloroaurat...

Example Embodiment

[0044] Example 3

[0045] In this embodiment, a hexagonal gold plate is prepared, such as image 3 a and image 3 As shown in b, there is also a twin interface in the middle. The top and bottom surfaces are composed of two hexagonal single crystals, a total of eight {111} type and six {100} type crystal planes; the side surface is composed of Six {111} crystal faces and six {100} crystal faces are arranged alternately. The top and bottom faces each have a {111} crystal face. The surface of the gold plate is wrapped by polyvinylpyrrolidone polymer, and its side length is dimensioned. It can reach 1-100 microns.

[0046] The specific preparation method includes the following steps:

[0047] a) Reaction system selection: Take 6ml of 1M chloroaurate, such as sodium chloroaurate or potassium chloroaurate, and 6ml of 1M polyvinylpyrrolidone (PVP) coating agent; add to 1000mL ethyl acetate at the same time In glycol (EG) solvent, a mixed solution of reactants is obtained after thorough m...

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Abstract

The invention relates to a nano or micron-scale gold disk and a preparation method thereof. The shape of the gold disk is a triangle or a hexagon. The middle of the gold disk is provided with a twin-plane boundary. The preparation method comprises the following steps of: selecting chloroauric acid or chloraurate and a polyvinylpyrrolidone capping agent in the same volume; adding the chloroauric acid or chloraurate and the polyvinylpyrrolidone coating agent into a solvent of ethylene glycol and obtaining a mixed solution of reactants after mixing; transferring the obtained solution to a polyfluortetraethylene container and sealing the polyfluortetraethylene container in a metal high pressure autoclave; heating the solution for 2 to 12 hours and allowing the solution to cool naturally to room temperature to obtain orange red sol; subjecting the orange red sol to natural settling by using ethanol or acetone for 24 hours or to centrifugal settling in a centrifuge for 30 minutes; removing supernatant liquid to obtain orange yellow precipitate; continuing to wash the orange yellow precipitate with ethanol or acetone, and settling for times to remove excess PVP and EG solvent by washing; and finally, obtaining the polyvinylpyrrolidone-coated nano and micron-scale gold disk. The method is simple and safe in equipment and process, strong in commonality and manageability, and capable of realizing large-scale production.

Description

technical field [0001] The invention relates to a nano- and micron-sized disc-shaped gold material and a preparation method thereof, in particular to a nano- or micron-sized triangular or hexagonal gold disc with a twin crystal structure and a preparation method thereof. Background technique [0002] Due to the surface plasmon resonance effect of noble metal gold nanomaterials, researchers have generally paid attention to them. This characteristic can be used in the study of surface-enhanced Raman spectroscopy and the construction of highly sensitive biosensors and optical waveguide devices. Since the surface plasmon resonance effect of gold is closely related to the shape of its nanomaterials, many new methods for preparing gold nanomaterials with different shapes (such as wires, rods, strips, disks, cubes, etc.) have been developed. However, how to further control and maintain the evolution and growth of the shape to the macroscopic size while controlling the formation of...

Claims

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Application Information

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IPC IPC(8): C30B29/02C30B29/60B22F9/18B22F1/02C22B11/00
Inventor 江鹏
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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