A kind of preparation method of pH flexible sensor and passive sensing detection method

Abstract

The invention relates to a preparation method of a pH flexible sensor and a passive sensing and detection method. The pH flexible sensor includes: a PET flexible substrate, an ITO conductive film, a reference electrode modified by Ag / AgCl, a hydrogel coating, and an ITO working electrode and UV-curable adhesive; the ITO working electrode and the Ag / AgCl modified reference electrode are arranged in parallel and isolated on the PET flexible substrate to form an electrode pair; the hydrogel coating is arranged on the sensing area of ​​the electrode pair, and the UV-cured adhesive The mixture is arranged on the conductive area of ​​the electrode pair. The materials used in the invention are easy to obtain and low in price. The preparation method is simple, all of which are carried out at room temperature, avoids complicated biological modification process, is easy to store, and has stable performance. The sensor is small in size, flexible and transparent, and combined with the passive information acquisition module, it realizes the real-time quality monitoring of cold chain chilled food in the complex environment of the cold chain process. Realized non-contact non-destructive testing of cold chain chilled food.

Description

technical field [0001] The invention relates to a preparation process of a pH flexible sensor and a passive sensing detection method, and has wide application prospects in the field of food safety detection. Background technique [0002] Many studies have shown that cold chain chilled food will be infected by bacteria and other microorganisms during the refrigeration process to decompose proteins or amino acids, thereby producing alkaline nitrogen-containing organic substances such as ammonia and amines, such as trimethylamine (TMA) , Dimethylamine (DMA), etc. These substances are volatile and are collectively referred to as volatile organic compounds. They are characterized by the content of volatile basic nitrogen (TVB-N). The higher the content, the more serious the spoilage, and it is a key indicator reflecting the quality of cold chain chilled food. , It is also the basis for realizing the non-destructive high-precision quality dynamic detection of cold chain chilled f...

AI Technical Summary

Problems solved by technology

Headspace gas chromatography detection method is currently one of the most reliable methods for measuring volatile organic compounds, but this method has the characteristics of complex operation, high cost and difficult error control, and cannot achieve fast and accurate dynamic detection; gas sensor array electronics The nose method can quantitatively and qualitatively detect and identify by forming an array of various gas sensors. However, the current gas sensors are still based on semiconductor metal oxides and electrochemistry. The gas sensor acquisition array hardware system is large and rigid, and requires additional power or batteries. Power supply work, there are problems such as large sensing volume, high detection cost, high energy consumption, and insufficient measurement accuracy, so it is difficult to apply to the actual dynamic detection of chilled food cold chain; ), indicating the color change caused by the indicator film and the indicator to indicate its concentration, which has the characteristics of passive, non-destructive, low cost, and simple visualization. Problems such as dynamic acquisition and flexible deployment of some indicators

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