Bisphenol A disposable paper-based sensor and its preparation method and application

Abstract

The invention belongs to the technical field of electrochemical detection and provides a bisphenol A disposable paper base sensor which is capable of being used for detecting bisphenol A and is convenient to use, high in reproducibility and low in cost and the preparing method and application thereof. The bisphenol A disposable paper base sensor comprises coated paper, wherein the coated paper is plated with a titanium film, the titanium film is pated with a gold film, an adhesive tape layer adheres to the gold film and covers 50-80% of the total area of the gold film, a round hole is formed in the adhesive tape layer, and the portion, where the round hole is formed, of the gold film is modified with a layer of multiwalled carbon nanotubes. According to the bisphenol A disposable paper base sensor, the coated paper is taken as the electrode substrate, the titanium film is arranged on the coated paper through sputtering to serve as a bonding layer, the gold film is arranged on the titanium film through sputtering to serve as the substrate of modification reaction and has high conductivity, so that electrical transmission capacity is improved, and experiments prove that the paper base sensor can well respond to bisphenol A. The preparing method is simple, cost is low, materials are environmentally friendly, bulk preparation can be achieved, reproducibility is high, and machining and using are convenient.

Description

technical field [0001] The invention belongs to the technical field of electrochemical detection, in particular to a bisphenol A disposable paper-based sensor and its preparation method and application. Background technique [0002] Bisphenol A (Bisphenol A, referred to as BPA), the chemical name is 2,2-bis(4-hydroxyphenyl)propane, which is a low-toxic chemical substance and is widely used in the production of polycarbonate, epoxy resin and other materials. It is often used in In the production of toys, baby bottles, drinking cups, food packaging materials and other products. Its structure is similar to androstradiol and diethylstilbestrol, so it has similar effects to other environmental hormones, exerts estrogenic effects, interferes with organism reproduction, growth and development, nervous system, immune system, etc., and even induces cancer. All countries in the world have issued corresponding laws and regulations to prohibit the application of bisphenol A. Therefore...

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Problems solved by technology

[0003] In the prior art, the flat conductor layer is used as the electrode base, the polymer conductive film is used as the bonding layer, the flat conductor layer is made of ITO glass, and the polymer conductive film is made of carbon conductive glue, but the sensor can only be used to detect hexavalent chromium. It cannot be used to detect bisphenol A, and the cost is high. It needs to be cut with special tools when making it, which is inconvenient to make

[0004] At present, the electrochemical detection of bisphenol A mostly uses nanomaterial-modified glassy carbon electrodes and metal electrodes as working electrodes for detection. It is easy to passivate the surface of the working electrode, and the surface active sites of the modified electrode are occupied by bisphenol A oxidation products, which cannot be used for multiple measurements of bisphenol A

Therefore, the problem with these electrodes is that they need to be polished before each use, and the process is very cumbersome, and the effect becomes worse after treatment, and the reproducibility is poor, which leads to inaccurate test results and cannot meet the needs of actual testing.

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