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A kind of porous gold nanowire and its preparation method and application

A gold nanowire and nanowire technology, applied in the field of fluorescence-enhanced porous gold nanowire and its preparation, can solve the problems of inability to realize micro-region detection and fluorescence imaging, few fluorescence enhancement sites, large size, etc., and achieve pore size distribution The effects of narrow range, reduced background interference, and uniform fluorescence enhancement

Active Publication Date: 2016-10-26
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For the former, there are few fluorescence enhancement sites on each nanostructure, and individual manipulation cannot be performed; the latter can be manipulated, but the size is large, and detection and fluorescence imaging of tiny regions cannot be realized

Method used

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  • A kind of porous gold nanowire and its preparation method and application
  • A kind of porous gold nanowire and its preparation method and application
  • A kind of porous gold nanowire and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0062] Au will be obtained 0.36 Ag 0.64 The nanowires were immersed in 65-68w% concentrated nitric acid and corroded for 6 hours. The nitric acid corroded the silver element, and the remaining gold atoms were re-polymerized and arranged to form a three-dimensional continuous nanopore and gold skeleton structure; after the concentrated nitric acid treatment, the Add excess dilute ammonia water; filter and separate the porous gold nanowires, wash with deionized water, disperse in water, and set aside. The SEM characterization images of the prepared porous gold nanowires are as follows: Figure 4 The pore sizes are shown in Table 1.

Embodiment 2-6

[0064] According to the same method as in Example 1, the nitric acid corrosion was carried out, and the corrosion time was changed to 5min, 15min, 1h, 3h, and 11h respectively, and porous gold nanowires with different pore diameters were prepared, and the pore diameters were as shown in Table 1:

[0065] Table 1

[0066] Numbering

[0067] It can be seen from Table 1 that with the prolongation of the nitric acid treatment time, the equivalent size of the pores and skeleton structure gradually increases, and the relationship between the equivalent size of the pores and the skeleton and the nitric acid corrosion time is as follows: Figure 5 shown.

[0068] In addition, the length of the porous gold nanowire in Example 1 is 10 μm and the diameter is 250 nm; the length of the porous gold nanowire in Example 2 is 12 μm and the diameter is 250 nm; the length of the porous gold nanowire in Example 3 is 15 μm and the diameter It is 250nm; The length of the porous gold nan...

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Abstract

The invention discloses a porous gold nanowire and a manufacturing method and the application of the porous gold nanowire. The length of the porous gold nanowire is 10 micrometers-100 micrometers, the diameter of the porous gold nanowire is 20 micrometers-500 micrometers, pore-shaped structures of which the pore diameter is 5 micrometers-100 micrometers are evenly distributed in the porous gold nanowire, and the pore diameter is smaller than the diameter. According to the manufacturing method, with a PC nuclear track film being a template, an electrochemical deposition method is utilized for manufacturing a gold-silver alloy nanowire, the gold-silver alloy nanowire is separated from the template, and a dispersed nanowire is obtained; nitric acid is utilized for removing silver elements in alloy, so that the porous gold nanowire is formed. Compared with a non-porous gold nanowire, the porous gold nanowire has a more remarkable fluorescence-enhancement effect and enhances the fluorescence by 72 times to the maximum degree, and the non-porous gold nanowire enhances the fluorescence by 2.9 times only. According to the manufacturing method, the one-dimensional nanowire having the remarkable and even fluorescence enhancement effect is obtained for the first time. The gold nanowire of a segmented structure is further manufactured, and the porous part of the gold nanowire has remarkable fluorescence intensity.

Description

technical field [0001] The invention belongs to the technical field of metal nanomaterials, and in particular relates to a porous gold nanowire for fluorescence enhancement, a preparation method and application thereof. Background technique [0002] At present, there are few reports on the fluorescence enhancement of one-dimensional nanomaterials, mainly limited to silver nanowires. The fluorescence enhancement intensity of a single silver nanowire is low, and the enhancement effect is only at both ends (the middle section is very weak and almost 0), and the distribution of fluorescence enhancement is uneven. In addition, the key to achieving fluorescence enhancement is that the local surface plasmon resonance (LSPR) wavelength range of nanomaterials matches the excitation light or fluorescence spectrum of fluorescent molecules. For simple nanowires, when the size and aspect ratio remain unchanged, Under the circumstances, it is difficult to realize the adjustment of the wa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00C25C5/02C09K11/58C09K11/02B82Y30/00B82Y40/00
Inventor 陆跃翔袁航王哲王玉兰陈靖
Owner TSINGHUA UNIV
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