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Preparation method of porous film layer, electrochemical sensor and preparation method thereof

A sensor and electrochemical technology, applied in the field of electrochemical detection, can solve problems such as the reduction of mechanical and electrical properties of the porous film layer, the reduction of porosity and specific surface area, and the complex composition of the sol solution system, so as to achieve system ratio optimization, Effect of high porosity and improved detection performance

Active Publication Date: 2022-04-29
SUZHOU INST OF BIOMEDICAL ENG & TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, during the gelation reaction process of the sol solution, due to the volatilization of the solvent, the internal surface tension of the gel increases, causing the gel network to crack, the pore structure of the gel collapses, and the porosity and specific surface area decrease, making the porous membrane layer The mechanical and electrical properties are reduced, which affects the normal use of membrane electrodes
In order to maintain the pore structure of the porous membrane layer, it is usually necessary to add a porogen to the sol solution, which makes the system components of the sol solution complex, which is not conducive to the optimal adjustment of the composition ratio in the sol solution

Method used

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  • Preparation method of porous film layer, electrochemical sensor and preparation method thereof
  • Preparation method of porous film layer, electrochemical sensor and preparation method thereof
  • Preparation method of porous film layer, electrochemical sensor and preparation method thereof

Examples

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Embodiment 1

[0078] The present embodiment provides a kind of manufacturing mold 1 of porous film layer, as figure 1 As shown, a laminated preparation layer 11 and base layer 12 are included. The side of the preparation layer 11 facing the base layer 12 is recessed inward to form a pattern groove for preparing a porous film layer, and at least one sample inlet of the sol solution is provided on the side of the preparation layer 11 away from the base layer 12, and the inlet is connected. Graphic groove. The patterned grooves in the preparation layer 11 are prepared by methods such as micro-electro-mechanical machining (MEMS) or digitally controlled precision machining (CNC). After the preparation layer 11 is obtained, the contact surfaces of the preparation layer 11 and the base layer 12 are respectively surface treated, and then the preparation layer 11 is bonded on the base layer 12, and the pattern grooves in the preparation layer 11 are used as the preparation layer. The reaction cham...

Embodiment 2

[0081] This embodiment also provides a method for preparing a porous film layer. The porous film layer is prepared using the mold 1 of Example 1. The preparation method specifically includes the following steps:

[0082] (1) Get the aqueous solution (5mg / mL) of the graphene oxide of 1mL, add the vitamin C of 1mg wherein, after vitamin C fully dissolves, obtain graphene sol solution;

[0083] (2) The graphene sol solution is injected into the pattern groove through the injection port of the mold 1, and then the injection port is sealed to form an airtight reaction chamber; the mold 1 is placed in a water bath and kept at a temperature of 50°C 2h, obtain graphene porous gel;

[0084] (3) Open the sealed sample inlet to form an opening communicating with the outside world in the reaction chamber, and use deionized water to perform solvent replacement on the graphene porous gel for 6-9 times through the sample inlet to obtain a purified graphene porous gel. glue; after the graphe...

Embodiment 3

[0086] This embodiment provides a preparation method of a porous film layer, which differs from the preparation method provided in Example 2 in that:

[0087] In step (1), take 1mL of graphene oxide aqueous solution (10mg / mL), add 5mg of vitamin C to it, after vitamin C is fully dissolved, obtain graphene sol solution; In step (2), mold 1 is placed In a water bath, keep at a temperature of 70° C. for 0.5 h to obtain a graphene porous gel.

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Abstract

The invention discloses a preparation method of a porous film layer, which comprises the steps of placing a precursor solution in a closed reaction chamber to make it gel to obtain a porous gel. The above preparation method can avoid gel pore collapse by making the sol solution gel in a closed reaction chamber, and obtain a porous film layer with uniform pores and high porosity. The invention discloses an electrochemical sensor, which comprises a first electrode array and a second electrode array, the first electrode array and the second electrode array share a first reference electrode, and the outer surface of the first reference electrode and the enzyme electrode is covered Hydrophobic porous membrane. The electrochemical sensor has a high degree of integration, the two electrode arrays share the first reference electrode, and can be arranged in the same detection channel, which simplifies the electrode structure of the sensor. The invention discloses a preparation method of the above-mentioned electrochemical sensor, which has simplified preparation procedures and high preparation efficiency.

Description

technical field [0001] The invention relates to the technical field of electrochemical detection, in particular to a preparation method of a porous film layer, an electrochemical sensor and a preparation method thereof. Background technique [0002] Point Of Care Testing (POCT), that is, bedside testing, is a new field of medical testing technology development. POCT eliminates the complicated processing procedures of laboratory testing, and can be carried out at the sampling site, using portable analytical instruments and supporting reagents to quickly obtain test results. POCT does not require a fixed location, and is suitable for different application scenarios such as emergency rooms, outpatient clinics, patient bedsides, accident scenes, and the field; and can significantly shorten the inspection cycle, diagnose and treat patients in a timely manner, and provide first aid in the field and emergency treatment in hospitals. , chronic disease prevention and control, and fa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/27G01N27/30G01N27/327G01N27/333
CPCG01N27/27G01N27/307G01N27/3272G01N27/333
Inventor 周连群李金泽张芷齐李传宇姚佳张威郭振
Owner SUZHOU INST OF BIOMEDICAL ENG & TECH CHINESE ACADEMY OF SCI
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