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Preparation method of gold octahedron-graphene composite nanomaterial and sensor chip based thereon and its application

A graphene composite and nanomaterial technology, which is applied in the fields of nanotechnology, nanotechnology, and analytical materials for materials and surface science, and can solve the problems of high cost, slow detection reaction speed, and insufficient sensitivity of trace heavy metal ions. , to achieve strong loading capacity, low detection limit, and good absorption of trace heavy metal ions

Active Publication Date: 2019-10-08
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But in general, the existing methods are either costly, or the detection reaction speed is slow, and the response to trace heavy metal ions is not sensitive enough.

Method used

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  • Preparation method of gold octahedron-graphene composite nanomaterial and sensor chip based thereon and its application
  • Preparation method of gold octahedron-graphene composite nanomaterial and sensor chip based thereon and its application
  • Preparation method of gold octahedron-graphene composite nanomaterial and sensor chip based thereon and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1 Preparation of gold octahedron-graphene composite nanomaterials and application of the structure to prepare sensor chips

[0028] 1. Preparation of gold octahedron-graphene composite nanomaterials

[0029] Follow the steps below:

[0030] (1) Preparation of gold octahedral nanostructures

[0031] Prepare gold octahedron nanostructure by chemical method, at first the ethylene glycol of 20mL, the polyethylene (Poly) of 0.4mL is added the phosphoric acid (H 3 PO 4 ), after mixing and stirring for 2 minutes, add 0.02mL of chloroauric acid (HAuCl 4 ), reacted at room temperature for 15 minutes, and then kept heating at 195°C for 30 minutes in an oil bath. During the reaction, the solution changed from colorless to purple and then to brown, and finally a gold octahedral nanostructure was obtained. The size of the obtained gold octahedral nanostructure is 80-100nm, and its structure is as follows: figure 1 shown.

[0032] (2) Prepare graphene film material

[...

Embodiment 2

[0040] Embodiment 2 SPR optical fiber sensor using gold octahedron-graphene composite nanomaterial and its application

[0041] 1. Construction of SPR fiber optic sensor using gold octahedron-graphene composite nanomaterials

[0042] Utilize the sensor chip that is plated with gold octahedron-graphene composite nano film prepared in embodiment 1, construct SPR fiber optic sensor, this SPR fiber optic sensor is made up of following assembly (its structural representation is as follows Figure 4 Shown): (1) Light source component - broadband light source (HL-2000), the wavelength range is 350nm-1050nm, (2) Optical transmission component - optical fiber for transmitting optical signals, (3) SPR sensor chip - ——that is, the sensor chip coated with gold octahedron-graphene composite nanofilm prepared in Example 1, used for light path reflection, enhancing adsorption and photoelectric characteristics, (4) water tank——for holding detection samples, (5) ) accepts components - spectru...

Embodiment 3

[0048] (1) Preparation of gold octahedral nanostructures

[0049] Prepare gold octahedral nanostructure by chemical method, at first the ethylene glycol of 18mL, the polyethylene (Poly) of 0.39mL is added the phosphoric acid (H 3 PO 4 ), after mixing and stirring for 2 minutes, add 0.015mL of chloroauric acid (HAuCl 4 ), reacted at room temperature for 12 minutes, and then kept heating at 185° C. for 35 minutes in an oil bath. During the reaction, the solution changed from colorless to purple and then to brown, and finally a gold octahedral nanostructure was obtained. The size of the obtained gold octahedral nanostructure is about 100nm.

[0050] (2) Preparation of gold octahedron-graphene nanostructures

[0051] In the preparation process of the gold octahedron-graphene nanostructure, the prepared gold octahedron is diluted with 99.7% alcohol with a solubility of 14ml, and the gold octahedron solution is observed under the scanning electron microscope without large-scale a...

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Abstract

The invention discloses a preparation method for a gold octahedron-graphene composite nanomaterial, which includes the following steps: (1) preparation of octahedron nanostructure: 18mL to 22mL of ethylene glycol and 0.39mL to 0.41mL of polyethylene are added into 0.7mL to 0.8mL of 1M phosphoric acid and mixed, 0.015mL to 0.02mL of 0.5M chloroauric acid is added, reaction takes place under room temperature for 12 to 18 minutes, reaction then takes place for 25 to 35 minutes while 185 DEG C to 195 DEG C is kept, and thereby a gold octahedron nanostructure solution is obtained; (2) preparation of gold octahedron-graphene composite nanomaterial: a prepared gold octahedron nanostructure solution is diluted by 14ml to 16ml of alcohol, an ultrasonic machine is used for ultrasonic treatment until the solubility of the solution is suitable for spin coating, and a spin coater is used for spin-coating the solution onto a single layer of graphene. The invention further discloses a sensing chip based on the gold octahedron-graphene composite nanomaterial and a preparation method and application thereof.

Description

technical field [0001] The invention relates to a graphene composite material and its application field, in particular to a preparation method of a gold octahedron-graphene composite nanomaterial and a sensor chip based on it and its application. Background technique [0002] Surface Plasmon Resonance (SPR) sensors have been widely used in life sciences, clinical diagnosis, drug screening, food safety, environmental monitoring and other fields due to their advantages of real-time and high sensitivity. With the society's higher and higher requirements for environmental detection technology, real-time, fast, and high-sensitivity SPR sensing technology has become a major research direction for heavy metal ion detection. [0003] SPR is the evanescent wave generated when p-polarized light is totally reflected at the interface between glass and metal-graphene nanostructures, triggering free electrons on the surface of metal-graphene nanostructures to generate surface plasmons, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/552B82Y30/00B82Y40/00
Inventor 刘安平孙晓楠黄映洲杨东侠李可可张雪梅于可可
Owner CHONGQING UNIV
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