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Gold nanometer probe, gold nanometer probe testing paper, preparation methods of gold nanometer probe and gold nanometer probe testing paper, and applications of gold nanometer probe and gold nanometer probe testing paper

A gold nanometer and gold nanoparticle technology, applied in the field of detection, can solve problems such as narrow detection range, and achieve the effect of high sensitivity and high selectivity

Inactive Publication Date: 2016-04-06
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Claims
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Problems solved by technology

[0004] In recent years, in the field of nanomaterials, there has been research on the development of sensors for the detection of arsenic ions. Among the optical sensor-related detection methods that use gold nanoparticles as sensors to detect arsenic ions, they all show high sensitivity for the detection of arsenous acid. However, due to the detection range Narrow, and requires special drugs to selectively detect arsenous acid

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  • Gold nanometer probe, gold nanometer probe testing paper, preparation methods of gold nanometer probe and gold nanometer probe testing paper, and applications of gold nanometer probe and gold nanometer probe testing paper
  • Gold nanometer probe, gold nanometer probe testing paper, preparation methods of gold nanometer probe and gold nanometer probe testing paper, and applications of gold nanometer probe and gold nanometer probe testing paper
  • Gold nanometer probe, gold nanometer probe testing paper, preparation methods of gold nanometer probe and gold nanometer probe testing paper, and applications of gold nanometer probe and gold nanometer probe testing paper

Examples

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preparation example Construction

[0038] As mentioned above, in order to solve the shortcomings of the prior art, the present invention provides a gold nanoprobe, which includes gold nanoparticles and a lead compound coated on the surface of the gold nanoparticles. The preparation method comprises the steps of: preparing a gold nanoparticle solution; adding the gold nanoparticle solution and the lead ion solution to the glycine-sodium hydroxide solution, so that the lead compound is coated on the surface of the gold nanoparticle, and the gold nanoparticle solution is obtained. probe.

[0039] The present invention also provides a gold nanoprobe test paper, including a test paper body and a gold nanoprobe adsorbed on the test paper body, wherein the gold nanoprobe refers to the gold nanoprobe provided above. The preparation method of the gold nanoprobe test paper comprises the steps of: preparing a gold nanoparticle solution; adding sodium citrate solution to the gold nanoparticle solution to obtain a first sol...

Embodiment 1

[0042]1. Using sodium citrate as a chemical reducing agent to reduce tetrachloroauric acid into gold nanoparticles. Specifically, add 50ml of 0.01% tetrachloroauric acid solution into a round-bottomed flask equipped with a condensing reflux tube, heat and stir until boiling, then quickly add 0.5ml of 1% sodium citrate, and continue heating for 8 minutes. After stirring, the color of the solution changed from light yellow to reddish purple. After cooling to room temperature in an ice bath, the gold nanoparticle solution was obtained and stored at 4°C. Wherein, transmission electron microscopy (H7100, Hitachi High-Tech Co., Tokyo, Japan, TEM) can be used to detect the size of gold nanoparticles, and the test results show that the prepared gold nanoparticles have good dispersibility, and the average particle size is 32.3 ± 2.8nm . The absorption value of the gold nanoparticle solution can be detected by a double-beam ultraviolet-visible spectrophotometer (Cintra10e, GBC, Victori...

Embodiment 2

[0046] This example introduces the application of the gold nanoprobe prepared in Example 1 to detect the concentration of arsenous acid in water samples. like figure 2 As shown in the schematic diagram, the surface of gold nanoparticles is coated with lead compound particles. After reacting with arsenous acid in the water environment, the lead compound particles on the surface of gold nanoparticles can form arsenous acid complexes with arsenous acid, resulting in gold The aggregation of nanoparticles occurs, and the concentration of arsenous acid in the water sample is detected by observing the aggregation degree of gold nanoparticles. Wherein, the volume ratio of the gold nanoprobe solution to the water sample containing arsenous acid preferably ranges from 0.3 to 0.7:1, and is selected as 0.5:1 in this embodiment.

[0047] The absorption spectra of the following samples were detected by a double-beam UV-Vis spectrophotometer: (A) gold nanoparticle solution; (B) gold nanopr...

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Abstract

The present invention discloses a gold nanometer probe, which comprises gold nanoparticles and a lead compound coated on the surface of the gold nanoparticles. The preparation method comprises: preparing a gold nanoparticle solution; and adding the gold nanoparticle solution and a lead ion solution into a glycine-sodium hydroxide solution to carry out a reaction so as to make the lead compound be coated on the surface of the gold nanoparticles to obtain the gold nanometer probe. The present invention further discloses gold nanometer probe testing paper, which comprises a testing paper main body and the gold nanometer probe adsorbed on the testing paper main body. The present invention further discloses applications of the gold nanometer probe and the gold nanometer probe testing paper in detection of the arsenious acid concentration in water samples.

Description

technical field [0001] The invention relates to the technical field of detection, in particular to a gold nanoprobe and its preparation method and application, and also relates to a test paper containing the gold nanoprobe as well as its preparation method and application. Background technique [0002] In the natural environment, arsenic weathered from rocks and minerals, as well as arsenic emitted by humans, mostly exist in surface water bodies and sediments. There are four valence states of arsenic in water bodies (+5, +3, 0, -3 ), arsenic in nature mainly exists in the form of arsenate and arsenite. In the oxygen-enriched surface lake water, more arsenic tends to form arsenate. After the arsenate is transferred to the anoxic low-level lake water, it is reduced to arsenous acid by hydrogen sulfide and participates in the biological cycle. Arsenic elements enter the human body from drinking water and cause human harm, among which arsenic acid (+5) and arsenous acid (+3) ar...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N27/64
Inventor 林家骅黄志清杨令延翁承毅于建涛索广力
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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