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Preparation method for superstructure Au/Ag@Al2O3@Ag nanosphere array and SERS performance of superstructure Au/Ag@Al2O3@Ag nanosphere array

A technology of nanotube arrays and nanospheres, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems that the nanogap cannot generate electromagnetic field enhancement, is not conducive to SERS performance, and achieves high activity , good repeatability, wide application prospects

Inactive Publication Date: 2015-06-17
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, the nanogap cannot produce electromagnetic field enhancement, that is, it cannot become an effective SERS enhancement "hot spot", which is not conducive to the improvement of SERS performance.

Method used

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  • Preparation method for superstructure Au/Ag@Al2O3@Ag nanosphere array and SERS performance of superstructure Au/Ag@Al2O3@Ag nanosphere array
  • Preparation method for superstructure Au/Ag@Al2O3@Ag nanosphere array and SERS performance of superstructure Au/Ag@Al2O3@Ag nanosphere array
  • Preparation method for superstructure Au/Ag@Al2O3@Ag nanosphere array and SERS performance of superstructure Au/Ag@Al2O3@Ag nanosphere array

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Superstructure Au / AgAl 2 O 3 Preparation of Ag Nanosphere Array

[0023] (1) Preparation of titanium dioxide nanobowl array

[0024] Oxidize the pure titanium sheet in 0.26M ammonium fluoride glycol solution at 50 V oxidation voltage for 1.5 hours to obtain TiO 2 Nanotube array; then the generated TiO is removed by ultrasonic oscillation 2 Nanotube array, leaving lighter TiO on the titanium sheet 2 Nanobowl array. Finally, the titanium sheet with the shallower nanobowl array is oxidized in 0.26M ammonium fluoride glycol solution at 10 V oxidation voltage for 40 minutes to obtain hierarchical TiO 2 Nanobowl array; from figure 1 a It can be seen that the diameter of the nanobowl is about 150nm and the depth is about 60nm.

[0025] (2) Preparation of Au / Ag nanosphere array

[0026] TiO 2 The nanobowl array is used as a template, and two kinds of Au and Ag nanoparticles are ion sputtered sequentially to form an Au / Ag nanoparticle film (such as figure 2 b) Covered in...

Embodiment 2

[0029] Example 2: Superstructure Au / AgAl 2 O 3 SERS performance test of Ag nanosphere array

[0030] By selecting three other SERS substrates with different structures and a superstructure Au / AgAl 2 O 3 Compare the SERS performance of the Ag nanosphere array and evaluate its SERS performance. The other three selected substrates are: TiO 2 Nanobowl array template array ion sputtering Au and Ag nanoparticles, Au / Ag nanoparticle ball arrays, and Au / AgAg nanosphere arrays directly obtained by ion sputtering Ag nanoparticles on Au / Ag composite nanospheres (Au There is no Al between the Ag particles in the / AgAg nanospheres and the Au / Ag nanospheres 2 O 3 Dielectric layer separation). During the SERS performance test, these different substrates were tested in 10 -7 Soak in M ​​rhodamine (R6G) solution for 1 hour, and measure its Raman signal after drying at room temperature. image 3 a is 10 on the left -7 MR6G adsorbs the SERS spectra measured on these four substrates, image 3 a ...

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Abstract

The invention discloses a preparation method for a superstructure Au / Ag@Al2O3@Ag nanosphere array and the SERS performance of the superstructure Au / Ag@Al2O3@Ag nanosphere array. The anodizing method is implemented on a pure titanium sheet two times to prepare a titanium dioxide nanometer bowl array; the titanium dioxide nanometer bowl array serves as a template, and ion sputtering of Au and Ag nano-particles is carried out so as to form Au / Ag nano-particle film; annealing treatment is then carried out to agglomerate the Au / Ag nano-particle film so as to form an ordered Au / Ag alloy nanosphere array; an atomic layer deposition technology is adopted for wrapping the Au / Ag alloy nanosphere array with an ultra-thin aluminum oxide dielectric layer; finally an ion sputtering method is then adopted for sputtering the Ag nano-particles on Au / Ag alloy nanospheres forming wrapped with the aluminum oxide dielectric layer, and the Ag nano-particles are dispersed on the Au / Ag alloy nanospheres. The SERS activity of the superstructure Au / Ag@Al2O3@Ag nanosphere array is high, the SERS signal collecting repeatability is good, and the SERS activity is not influenced by changes of incident light angles.

Description

Technical field [0001] The invention relates to a superstructure Au / AgAl 2 O 3 Preparation method of Ag nanosphere array, and this superstructure Au / AgAl 2 O 3 The surface enhanced Raman scattering (SERS) effect of Ag nanosphere array belongs to the field of nanotechnology. Background technique [0002] Theoretical and experimental studies have shown that the SERS effect mainly comes from the "hot spots" of electromagnetic field enhancement in precious metal substrate materials. Generally speaking, when the gap between the nano-units in the noble metal substrate is less than 10 nm, strong local coupling will occur, thereby forming an electromagnetic field enhanced "hot spot", thereby increasing the SERS activity of the substrate. At the same time, in order to obtain a reproducible SERS signal, the SERS substrate is required to have evenly distributed electromagnetic field enhancement "hot spots". Based on this, the key to preparing the SERS substrate is to obtain an ordered arra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00C23C14/14C23C14/34C23C14/58C23C16/40C23C16/44B82Y40/00B82Y30/00G01N21/65
Inventor 胡小晔孟国文朱储红韩方明黄竹林
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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