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Preparation method and application of nano-wire/nano-particle modified electrode

A technology of nano-particles and modified electrodes, which is applied in the direction of material analysis, measurement devices, instruments, etc. by electromagnetic means, to achieve the effect of shortening the reaction time and simple preparation method.

Active Publication Date: 2016-06-15
DONGGUAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the prior art, there have been reports on the preparation of Au nanoparticle-modified electrodes and Au nanowire-modified electrodes, but there has been no report on the synthesis of Au ultra-long nanowires using tellurium Te ultra-long nanowires as templates.

Method used

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  • Preparation method and application of nano-wire/nano-particle modified electrode
  • Preparation method and application of nano-wire/nano-particle modified electrode
  • Preparation method and application of nano-wire/nano-particle modified electrode

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preparation example Construction

[0020] The invention discloses a method for preparing a nanowire-nanoparticle modified electrode. The method uses a tellurium Te superlong nanowire-nanoparticle composite system as a template to synthesize a gold Au superlong nanowire, and the steps are as follows:

[0021] Step 1, synthesis of Te ultra-long nanowires

[0022] 1.0g of polyvinylpyrrolidone and 0.01g of sodium tellurite were dissolved in 35mL of double-distilled water, ultrasonically dispersed for 1 hour to form a stable solution, and 1.65mL (40wt%) of hydrazine hydrate and 3.35mL (28wt%) of ammonia were added to the solution Aqueous solution, mixed quickly and moved into a 50mL polytetrafluoroethylene-lined reaction kettle, closed the reaction kettle and put it into a muffle furnace at 180°C for 4 hours of reaction. After the reaction, cooled at room temperature for 12 hours, poured Add 80-200mL of acetone, stand still for 12-24 hours, centrifuge and wash five times with double distilled water to obtain Te ultr...

Embodiment 1

[0031] (1) Synthesis of Te ultra-long nanowires

[0032] 1.0g of polyvinylpyrrolidone and 0.01g of sodium tellurite were dissolved in 35mL of double-distilled water, ultrasonically dispersed for 1 hour to form a stable solution, and 1.65mL (40wt%) of hydrazine hydrate and 3.35mL (28wt%) of ammonia were added to the solution Aqueous solution, mixed quickly and moved into a 50mL polytetrafluoroethylene-lined reaction kettle, closed the reaction kettle and put it into a muffle furnace at 180°C for 4 hours of reaction. After the reaction, cooled at room temperature for 12 hours, poured Add 120mL of acetone, stand still for 12 hours, centrifuge, and wash 5 times with double distilled water to obtain Te ultra-long nanowires;

[0033] (2) Synthesis of Au ultra-long nanowire-nanoparticle composite system using Te ultra-long nanowire as template

[0034] Accurately weigh 10mgHAuCl 4 4H 2 O was dissolved in 10mL of distilled water and stirred thoroughly to obtain 2.5mmol / LHAuCl 4 solu...

Embodiment 2

[0039] (1) Synthesis of Te ultra-long nanowires: same as in Example 1

[0040] (2) Synthesis of Au ultra-long nanowire-nanoparticle composite system using Te ultra-long nanowire as template

[0041] Accurately weigh 10mgHAuCl 4 4H 2 O was dissolved in 10mL of distilled water and stirred thoroughly to obtain 2.5mmol / LHAuCl 4 solution; accurately weigh 29.4mg of sodium citrate and dissolve it in 50mL of distilled water, stir thoroughly to obtain a 2mmol / L sodium citrate solution; accurately weigh 12.9mg of Te ultra-long nanowires (0.1mmol) and disperse them in 25mL of distilled water, stir well and add 2mL2.5mmol / LHAuCl 4 Solution and 1mL2mmol / L sodium citrate solution, keep ultrasonic power 50w, ultrasonic reaction for 50 minutes, in the absence of any other reagents, Te ultra-long nanowires and a part of HAuCl 4 Automatic generation of Au nanowires via a current shift reaction, while sodium citrate reduces another part of HAuCl 4 Au nanoparticles were obtained (attached ...

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Abstract

The invention relates to a preparation method and an application of a nano-wire / nano-particle modified electrode and especially relates to the preparation method and the application of a gold (Au) super-long nano-wire / nano-particle modified electrode. The preparation method includes the steps of: 1) synthesizing Te super-long nano-wires through a hydro-thermal method; 2) synthesizing Au super-long nano-wires with the Te super-long nano-wires as a template, and meanwhile, reducing HAuCl4 with sodium citrate to obtain Au nano particles; 3) enabling the Au nano particles to be attached to the surface of the super-long nano-wires to obtain an Au super-long nano-wire / nano-particle composite system; and 4) fixing the Au super-long nano-wire / nano-particle composite system onto the surface of a work electrode with naphthol to prepare the Au super-long nano-wire / nano-particle modified electrode. A nitrite sensor has a linear relationship when the nitrite concentration is 0.5-120 [mu]mol / L and can reach 0.2 [mu]mol / L in detection limit.

Description

technical field [0001] The invention relates to a preparation method of a nanowire-nanoparticle modified electrode, in particular to a preparation method and application of a gold Au ultra-long nanowire-nanoparticle modified electrode. Background technique [0002] Pickled food is loved by consumers because of its unique flavor and containing a large amount of vitamins, calcium, phosphorus and other inorganic substances, but it contains nitrite, which also makes many people stay away. Nitrite is potentially toxic, and it reacts with secondary amines in the stomach to generate carcinogen nitrosamines. The World Health Organization stipulates that the content of nitrite in pickled food shall not exceed 0.2mg / kg, and the content of nitrite in drinking water shall not exceed 3mg·L -1 . Therefore, the accurate detection of nitrite in food and drinking water is very important. Currently, methods for detecting nitrite include spectrophotometry, chromatography, and electrochemica...

Claims

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Application Information

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IPC IPC(8): G01N27/333
Inventor 程发良张燕张敏陈妹琼柳鹏蔡志泉
Owner DONGGUAN UNIV OF TECH
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