Fluorophore-Doped Plasma Coating for In-Line Characterization
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Solution Overview
Problem
Current methods for in-line characterization of plasma coatings, particularly those deposited by plasma deposition, face challenges due to the thinness of the coatings and the need for continuous monitoring in industrial processes, as existing techniques are not suitable for real-time quality assessment.
Innovation Solution
Incorporating fluorophores into plasma coatings, which allows for in-line characterization by monitoring the fluorescence emitted from these fluorophores during the coating process, using non-thermal plasma and afterglow regions to deposit coatings comprising the fluorophores, and irradiating the coated substrates with electromagnetic radiation to excite and monitor the fluorescence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional characterization techniques (XPS, SEM, EDX, profilometry, contact angle measurement, FTIR, BOM, AFM) are used to accurately determine coating properties, then measurement precision is improved, but these techniques are not suitable for in-line monitoring of continuous coating processes
Solution Approach 1:
The patent introduces fluorophores as intermediary substances that are incorporated into the plasma coating along with the coating precursor. These fluorophores serve as mediators that enable optical detection and characterization of the coating in real-time during continuous processing. The fluorophores convert the invisible thin coating into a fluorescent signal that can be monitored inline, thus bridging the gap between accurate measurement and continuous production monitoring.
Solution Approach 2:
The patent replaces conventional mechanical and complex analytical characterization techniques (such as profilometry, SEM, AFM) with a simpler optical detection method. By using fluorescence excitation and detection, the system substitutes complex mechanical measurement systems with optical fields and photodetectors, enabling in-line monitoring without interrupting the continuous coating process.
2Productivity
If plasma deposition is used for continuous coating processes, then productivity is improved, but the thinness of the coatings (a few nanometers) makes in-line characterization challenging
Solution Approach 1:
The patent utilizes fluorescence as an optical property change to detect the presence and characteristics of thin coatings. By incorporating fluorophores that emit light upon excitation, the invisible thin coating becomes optically detectable through its fluorescent signal. This color/optical property change enables easy in-line detection of nanometer-thin coatings without requiring complex measurement equipment.
3Productivity
If fluorophores are incorporated into plasma coatings, then in-line characterization capability is improved, but there may be concerns about maintaining fluorescent properties during plasma processing
Solution Approach 1:
The patent optimizes processing parameters such as plasma power, gas flow rates, and fluorophore concentration to maintain fluorescent properties during plasma deposition. By carefully controlling these parameters, the system ensures that the fluorophores incorporated into the coating retain their fluorescence capability, enabling reliable in-line characterization while maintaining continuous production capability.
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
Enables reliable in-line characterization of plasma coatings, allowing for timely adjustments in the coating process to prevent production errors, with the use of fluorophores maintaining their fluorescence properties and facilitating continuous industrial-scale monitoring.
Implementation Method 1
exposing the substrate to a non-thermal plasma (or an afterglow region of said plasma), said plasma (or afterglow) comprising at least one coating precursor and one fluorophore
Implementation Method 2
irradiating the coated substrate in-line with electromagnetic radiation suitable for exciting the fluorophore; and monitoring the light emitted from the fluorophore present in the coating
Data Source
Figure 1A~1B
Figure 2A~2B
AI summary
The present invention relates to processes for depositing a plasma coating on a substrate and coated substrates obtained thereby. The present invention further relates to processes for characterizing a plasma coating on a substrate. The process for depositing a plasma coating comprises the step of exposing the substrate to a plasma, said plasma comprising at least one coating precursor and one fluorophore other than said coating precursor.