Au NDC@Ag NRs probe and preparation method and application thereof

A probe, gold seed technology, applied in the direction of analysis, instrument, measuring device, etc. by chemical reaction of materials, can solve the problems of low accuracy, narrow detection range, cumbersome operation, etc., and achieve uniform shape and unique shape. , the effect of good chemical stability

Active Publication Date: 2020-12-22
CHONGQING UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the deficiencies of the above-mentioned existing detection technologies, the purpose of the present invention is to provide an Au NDC@Ag NRs probe and its preparation method and application, so as to solve the problems of high cost, cumbersome operation, narrow and sensitive detection range in the existing detection methods. The low accuracy leads to the problem of low accuracy

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  • Au NDC@Ag NRs probe and preparation method and application thereof
  • Au NDC@Ag NRs probe and preparation method and application thereof
  • Au NDC@Ag NRs probe and preparation method and application thereof

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Embodiment Construction

[0030] The present invention will be described in further detail below in conjunction with embodiment. The experimental methods used in the following examples are conventional methods unless otherwise specified. The materials and reagents used in the following examples can be obtained from commercial sources unless otherwise specified.

[0031] 1. Au NDC@Ag NRs probe and its preparation method

[0032] 1) Freshly prepared 0.25 mL NaBH 4 solution (25 mM) was quickly added to the solution containing HAuCl 4 (0.25 mM), CTAC (50 mM) and citric acid (5 mM) in 10 mL of a mixture, and then stirred rapidly at 30 ° C, after two minutes, the golden solution turned brown, and then the above mixture in Stir at 80°C for 90 min. During this process, the solution turns from brown to wine red. After the reaction, a gold seed solution is obtained, which is stored and aged at room temperature for 24 h, and is ready for use.

[0033] 2) Add 5 mL HAuCl to 100 mL CTAB solution (0.1 M) 4 (0....

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Abstract

The invention discloses an Au ND@Ag NRs probe and a preparation method and application thereof. The Au NDC@Ag NRs is a cylindrical core-shell structure, and the Au NDC@Ag NRs is a core-shell structuresynthesized by growing gold nano bicones (Au NDCs) on gold seeds and then growing silver nanorods on the surfaces of the Au NDCs. Based on catalytic etching caused by Cr<6+>, the morphology of the AuNDC@Ag NRs is changed, and attenuation of surface plasma resonance (SPR) and red shift of an absorption spectrum are caused. Meanwhile, along with the increase of the concentration of the Cr<6+>, theAu NDC@Ag NRs shows obvious color change, namely, the Au NDC@Ag NRs becomes colorless finally from orange to pink and then to purple. Rapid and obvious red shift and obvious color change are generated through etching of the Au NDC@Ag NRs, different target object concentrations corresponds to different color changes, the concentration of a detection object can be easily determined by naked eyes, and high-sensitivity naked eye detection on the Cr<6+> is realized. According to the invention, a simple, rapid and sensitive multicolor colorimetric method for detecting the Cr<6+> is established.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to an Au NDC@Ag NRs probe and its preparation method and application. Background technique [0002] The widespread use of hexavalent chromium in industry has resulted in increasingly serious water pollution. Hexavalent chromium ion (Cr 6+ ) is extremely toxic to the human body. Short-term or long-term exposure can cause abdominal pain, vomiting, dermatitis and other symptoms. In severe cases, there may even be a risk of cancer. The World Health Organization (WHO) and the Environmental Protection Agency (EPA) have established relevant rules and regulations that Cr in drinking water 6+ The maximum allowable concentration is 10 ppb. Therefore, how to realize real-time and effective monitoring of Cr in aqueous medium 6+ Therefore, the research and development of accurate, rapid, simple and economical analysis materials and methods is particularly urgent and crucial, which i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33G01N21/31G01N21/78
CPCG01N21/33G01N21/31G01N21/78G01N2021/786
Inventor 侯经洲霍丹群刘莎莎汪显峰刘自山
Owner CHONGQING UNIV
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