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A fabrication method of nanoring array SERS substrate assembled from Ag nanoparticles

A nanoparticle and nanotube array technology, applied in the field of nanomaterials, can solve problems such as complex preparation processes, and achieve the effects of good repeatability, low cost, and simple process

Inactive Publication Date: 2016-05-11
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology

However, in order to further improve the SERS activity, adjusting the gap between nanounits in these ordered structures to below 10nm requires complex and precise preparation processes, or requires subsequent processing and other procedures.

Method used

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  • A fabrication method of nanoring array SERS substrate assembled from Ag nanoparticles
  • A fabrication method of nanoring array SERS substrate assembled from Ag nanoparticles
  • A fabrication method of nanoring array SERS substrate assembled from Ag nanoparticles

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Embodiment Construction

[0020] (1) Preparation of titanium dioxide core / shell nanotube arrays:

[0021] The pure titanium sheet was oxidized in 0.26M ammonium fluoride in ethylene glycol solution at an oxidation voltage of 50V for 1 hour to obtain a titanium dioxide nanotube array ( figure 2 a); Then soak the titania nanotube array in 4M potassium hydroxide solution and 0.4M hydrochloric acid solution for 3 hours and 2 hours sequentially to obtain a titania core / shell structure nanotube array ( figure 2 SEM images in b, c, and d). (For specific preparation parameters and procedures, please refer to the patent: Hu Xiaoye, Meng Guowen, Wang Zhaoming, Liu Mao, etc., A preparation method of titanium dioxide core / shell nano-cable array, acceptance number: 201210392780.X)

[0022] Through this method, a nanowire shorter than the nanotube is obtained in each nanotube, forming a titanium dioxide ordered array with a nanorod core / nanotube shell structure. In this array, the upper surface of the nanotubes ...

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Abstract

The invention discloses a method for preparing a nanoring array SERS (Surface Enhanced Raman Spectroscopy) substrate assembled through Ag nanoparticles. The method comprises the following steps: firstly preparing a titanium dioxide nanotube array by adopting an anodic oxidation method; then sequentially soaking the titanium dioxide nanotube array in a potassium hydroxide solution with certain concentration and a hydrochloric acid solution for certain time to obtain a shorter titanium dioxide nanorod in each nanotube, wherein a small plane is formed between every two adjacent nanotubes; and finally assembling the Ag nanoparticles on rings positioned on the top ends of the raised nanotubes by adopting a method for carrying out ion sputtering on Ag, and controlling the time of the ion sputtering of Ag to obtain a nanoring array assembled through single-layer or multi-layer Ag nanoparticles. The method disclosed by the invention has the advantages of simple preparation process, low cost and simple equipment; the obtained nanoring array assembled through the Ag nanoparticles is regularly and sequentially arrayed within a large-area range and has the advantages of high SERS activity and good signal repeatability.

Description

technical field [0001] The invention relates to a preparation method of a nano ring array assembled by Ag nano particles, belonging to the technical field of nano materials. Background technique [0002] Theoretical and experimental studies have shown that the SERS effect mainly originates from the electromagnetic field enhancement "hot spot" in the noble metal substrate material. In general, when the gap between nanounits in a noble metal substrate is less than 10 nm, strong local coupling will occur, thereby forming an electromagnetic field-enhanced "hot spot", thereby improving the SERS activity of the substrate. At the same time, in order to obtain SERS signals with good repeatability, the SERS substrate is required to have uniformly distributed electromagnetic field enhanced "hot spots". Based on this, the key to fabricating SERS substrates is to obtain ordered arrays of nanostructures with gaps smaller than 10 nm. So far, various methods have been used to prepare SER...

Claims

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Application Information

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IPC IPC(8): C25D11/26C23C14/35C23C14/54C23C14/18B82B3/00B82Y30/00B82Y40/00
Inventor 胡小晔孟国文朱储红黄竹林陈本松李发帝王兆明
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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