Colorimetric Sensor via Single-Step UV Polymerization
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Solution Overview
Problem
Current methods for preparing colorimetric sensors for detecting oxidizing agents are complex, time-consuming, and costly, often requiring separate steps for preparation and activation, and are not adaptable to various applications due to fixed response times.
Innovation Solution
A simplified single-step process using a redox dye, semiconductor material, and di- or tri-acrylate monomer system, where the semiconductor catalyzes both polymerization and reduction reactions under UV irradiation, allowing for the preparation of reversible and modulated sensors with specific response times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate steps for preparation and activation are used, then the sensor can be properly formed and activated, but the process becomes complex and time-consuming
Solution Approach 1:
The patent combines the preparation and activation steps into a single simultaneous process. The semiconductor material serves dual functions: it acts as a catalyst for polymerization during preparation and as a photocatalyst for reduction during activation. This merging eliminates the need for separate processing steps while maintaining sensor reliability.
Solution Approach 2:
The semiconductor material performs multiple functions within the single-step process: it catalyzes polymerization of the monomer to form the polymer matrix, and subsequently acts as a photocatalyst under UV irradiation to reduce the redox dye. This multi-functionality resolves the contradiction by eliminating process complexity while ensuring proper sensor formation and activation.
2Reliability
If separate steps for preparation and activation are used, then the sensor can be properly formed and activated, but the production time increases
Solution Approach 1:
The patent merges preparation and activation into one simultaneous operation. By using the semiconductor material to catalyze both polymerization and subsequent photocatalytic reduction in a single process step, the production time is significantly reduced while maintaining sensor reliability.
Solution Approach 2:
The semiconductor material is pre-incorporated into the sensor composition before the single-step process begins. This preliminary incorporation allows it to immediately catalyze polymerization and then activate the redox dye when exposed to UV light, eliminating the need for separate preparation and activation steps and thus reducing production time.
3Ease of manufacture
If fixed sensor designs are used, then manufacturing is simplified, but adaptability to various applications is reduced
Solution Approach 1:
The patent enables adaptability by allowing modification of various parameters in the single-step process: different redox dyes can be used for different detection ranges, different monomers can adjust mechanical properties and response times, and varying semiconductor material compositions can tune sensitivity. This parameter flexibility provides application versatility while maintaining ease of manufacture through the unified process.
Solution Approach 2:
The universal single-step process design allows the same manufacturing approach to be applied across different applications by simply changing the chemical composition parameters. The semiconductor material's dual functionality as both polymerization catalyst and photocatalyst provides a universal platform that can be adapted to various sensor requirements without complicating the manufacturing process.
Data Source
AI summary
A process for the preparation of a colorimetric device (sensor) for detecting oxidizing agents, in particular for detecting the presence of oxygen comprising or consisting of—subjecting, to UV irradiation comprised between 200 and 400 nm, a pre-polymer solution comprising at least one redox dye, at least one semiconductor material and at least one di- or tri-acrylate monomer. Such device and its use in the packaging field, e.g. for packaging food or pharmaceutical products, represent aspects of the application of said devices.