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Electro-deposition gold nanoparticles, preparation method and application thereof

A nanoparticle and electrodeposition technology, applied in the direction of material electrochemical variables, etc., can solve the problems of time-consuming preparation process and poor stability of biosensors, and achieve the effect of speeding up the rate.

Inactive Publication Date: 2011-02-09
SHANGHAI QIBAO HIGH SCHOOL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These protein-based biosensors are poorly stable, highly affected by temperature and pH, and the preparation process is also quite time-consuming.

Method used

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  • Electro-deposition gold nanoparticles, preparation method and application thereof
  • Electro-deposition gold nanoparticles, preparation method and application thereof
  • Electro-deposition gold nanoparticles, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Example 1: Electrochemical method to deposit gold nanoparticles.

[0019] The self-made glassy carbon electrode (GCE) was firstly coated with 1.0, 0.3, 0.05 μm Al 2 o 3 Powder polished, ultrasonicated with water and ethanol for 5 min each, and blown dry with nitrogen. Immerse the electrode in 6 mL of 0.5 % HAuCl 4 solution (containing 0.5 M H 2 SO 4 , used N 2 Saturation for 15 minutes) and let it stand still, then use chronoamperometry to sweep at +1.1 V and 0 V for 60 s and 30 s respectively, and wash with distilled water after completion, and observe that a dark red solid appears on the surface of the glassy carbon electrode, which is Nanogold. Then put this electrode into 0.5 M H 2 SO 4 The voltammetry is used in the medium, the potential is -0.2 ~ 1.6 V and the peak current is basically unchanged (about 20 cycles) to remove the impurities adsorbed on the surface.

[0020] The morphology of electrodeposited gold nanoparticles is shown in figure 1 As shown,...

Embodiment 2

[0023] Example 2: Modification of GCE electrodes based on electrodeposited gold nanoparticles and magnetic iron ferric oxide nanoparticles.

[0024] Take 20 μL of 1 mg / mL nano-ferric oxide solution with a particle size of about 10 nm on a flat glass, and use a magnetic glassy carbon electrode with nano-gold deposited to magnetically adsorb FNPs on the electrode surface. GNPs acted as nanowires in this system and were closer to the redox centers of FNPs. increase the rate of electron transfer. From image 3 It can be seen that the peak current is proportional to the scan rate, indicating that the electron transfer process is controlled by surface adsorption. And according to the Laviron equation, the electron transfer constant is 0.1s -1 .

[0025] The electrochemical behavior of FNPs on the electrodeposited gold surface was investigated by cyclic voltammetry, as shown in Figure 4 As shown, by comparison, it can be seen that FNPs have no obvious redox peaks on the surface...

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Abstract

The invention relates to electro-deposition gold nanoparticles, a preparation method and application thereof to the field of electrochemical sensors, which is used for increasing the reaction surface area of an electrode and quickening the rate of electronic transfer, and the method of in-situ electrochemical deposition of the gold nanoparticles can be used for rapidly and simply constructing a nano platform of the electrochemical sensors.

Description

technical field [0001] The invention relates to an electrodeposited gold nanoparticle (GNPs), a preparation method thereof, and an application in the field of electrochemical sensors. Background technique [0002] Gold nanoparticles (GNPs) are the most stable noble metal nanoparticles, which are superior to other types of nanoparticles due to their excellent properties, such as electrical conductivity, biocompatibility and catalytic activity, and can greatly increase the surface area of ​​electrodes. In the field of electrochemical sensors (Li XX, Shen LH, Zhang DD, et al. Biosens Bioelectron. 2008 Jun 15;23(11):1624-30). In addition, appropriately sized and functionalized gold nanoparticles close to the redox centers of enzymes act as "nanowires" to enhance enzyme activity (Willner I, Baron R, Willner B. Biosens Bioelectron. 2007 Apr 15;22(9-10 ):1841-52; Xiao Y, Patolsky F, Katz E, et al. Science. 2003 Mar 21;299(5614):1877-81.). Gold nanoparticles in polyelectrolyte mul...

Claims

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Application Information

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IPC IPC(8): B22F9/24G01N27/30
Inventor 王晓岑周国亮于加石宋威廉孟书涵郭紫嫣
Owner SHANGHAI QIBAO HIGH SCHOOL
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