Color-Changing Carbon Quantum Dots for Cumulative UV Sensing
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Solution Overview
Problem
Current UV exposure markers are bulky, inconvenient to carry, and unable to measure cumulative UV exposure over time, limiting their effectiveness in monitoring human exposure to UV radiation.
Innovation Solution
The production of carbon quantum dots through a solvothermal reaction using blue inkjet printer dye, urea, and an organic solvent in a high-pressure reactor, which changes color or fluorescence based on cumulative UV exposure, enabling the creation of a portable color change sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current UV markers are used, then real-time light quantity measurement is achieved, but the device is bulky and cannot measure cumulative light quantity
Solution Approach 1:
The patent applies color change principle by using carbon quantum dots that undergo cumulative color changes when exposed to UV light. The carbon quantum dots change from blue to green to red as UV exposure accumulates, providing visual indication of cumulative UV dosage without requiring complex electronic components or power sources.
Solution Approach 2:
The patent utilizes parameter changes by modifying the optical properties (color and fluorescence) of carbon quantum dots in response to cumulative UV exposure. The fluorescence intensity and color wavelength shift systematically with accumulated UV dose, enabling quantitative measurement through simple optical detection.
2Ease of operation
If current UV markers are used, then real-time measurement is achieved, but portability and convenience are reduced
Solution Approach 1:
The carbon quantum dots provide portable UV monitoring through direct visual color changes and fluorescence variations that can be observed with the naked eye or simple UV lamps, eliminating the need for bulky electronic displays, power sources, and complex circuitry required by conventional UV meters.
Solution Approach 2:
The carbon quantum dots perform self-service by automatically recording and displaying cumulative UV exposure through their intrinsic color and fluorescence changes. The material itself serves as both the sensor and the display, requiring no external power source, electronics, or complex operation procedures.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The carbon quantum dots-based sensor effectively indicates cumulative UV exposure by changing color or fluorescence, allowing for the monitoring of UV exposure over time with high portability and convenience.
Implementation Method 1
performing solvothermal reaction on blue inkjet printer dye, urea and an organic solvent in a high pressure reactor
Implementation Method 2
the carbon quantum dots obtained via the solvothermal reaction have change in color or fluorescence based on a cumulative amount of exposure thereof to UV light
Data Source
AI summary
Disclosed are a method for producing carbon quantum dots having color change based on a cumulative amount of exposure thereof to UV light, and to a color change sensor including the same that indicates a cumulative UV amount. The method for producing the carbon quantum dots include performing solvothermal reaction on blue inkjet printer dye, urea and an organic solvent in a high pressure reactor.