Optical Waveguide Sensor Coating for Uniform Radioisotope Detection
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Solution Overview
Problem
Existing optical sensors for detecting radioactive isotopes face issues with non-uniform thin-film coating, agglomeration due to silylating agents, and inability to detect both radioactive ions and isotopes, leading to non-repeatability, non-reproducibility, bulkiness, and high costs.
Innovation Solution
A method for fabricating an optical waveguide sensor using a crosslinking agent, scintillating agent, and ligand on a silica or silicon substrate, avoiding silylating agents, ensuring uniform coating through esterification and amine conjugation, allowing detection of radioactive isotopes by fluorescence and refractive index changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If silylating agents are used to coat the substrate surface, then the substrate surface can be functionalized, but agglomeration occurs that decreases surface uniformity
Solution Approach 1:
The patent changes the chemical parameters of the coating process by using carboxylic acid functional group containing organic molecules instead of silylating agents. This parameter change eliminates the agglomeration problem while maintaining surface functionalization capability, achieving both surface uniformity and detection reliability
Solution Approach 2:
The patent employs a simple organic molecule coating approach that can be easily applied and removed, replacing complex silylating agent systems. This enables reproducible coating processes that can be repeatedly applied without cumulative degradation, improving both manufacturing precision and reliability
2Productivity
If thin-film coating is employed for detection, then compact size and fast response time are achieved, but non-uniform coating layer results in non-repeatability and non-reproducibility
Solution Approach 1:
The patent modifies the coating chemistry by using carboxylic acid functional groups that provide better wetting and adhesion properties on the substrate surface. This parameter change enables formation of uniform thin-film layers while maintaining the compact size and fast response time advantages of thin-film technology
Solution Approach 2:
The carboxylic acid functional group containing organic molecules act as an intermediary layer that improves the interface between substrate and detection layer. This intermediary coating ensures uniform distribution and adhesion, preventing the non-uniformity that leads to non-repeatability while preserving the fast response characteristics
3Adaptability or versatility
If current sensor designs are used, then detection capability is achieved, but the sensors are bulky, complicated and costly to fabricate
Solution Approach 1:
The patent extracts and eliminates unnecessary complex components from traditional sensor designs by using a simple organic molecule coating approach. The core detection functionality is retained through the scintillating agent and ligand system, while removing bulky and complicated fabrication steps, resulting in a more streamlined and cost-effective sensor design
Solution Approach 2:
The patent creates a multi-functional coating system where carboxylic acid functional group containing organic molecules serve multiple purposes: surface functionalization, adhesion promotion, and uniform layer formation. This universal approach consolidates multiple functions into a single coating process, reducing overall device complexity and fabrication cost while maintaining detection versatility
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 method ensures consistent and reproducible detection of radioactive isotopes with improved sensitivity and detection range, facilitating mass production and environmental sustainability.
Implementation Method 1
the molecules of the scintillating agent fluoresce in response to the ionizing radiation from the radioactive isotope
Implementation Method 2
coating the crosslinked substrate surface with a scintillating agent for forming a substrate surface containing scintillating agent
Implementation Method 3
upon adsorption of the ions containing the radioactive isotope from the aqueous solution on the surface of the optical waveguide sensor
Implementation Method 4
coating the treated substrate surface with the crosslinking agent selected from a group comprising carboxylic acid functional group containing organic molecules for forming a crosslinked substrate surface
Implementation Method 5
triggers a measurable change in material optical refractive index of the ligand of the functionalized substrate surface
Data Source
AI summary
The present invention relates to a method for forming an optical waveguide sensor for detecting ions containing radioactive isotopes in an aqueous solution. The method comprises treating a substrate surface by cleaning the substrate surface with one or more solvents to enable coating with a crosslinking agent, the substrate being selected from silica or silicon substrate, coating the treated substrate surface with the crosslinking agent selected from carboxylic acid functional group containing organic molecules to form a crosslinked substrate surface, coating the crosslinked substrate surface with a scintillating agent, and coating the substrate surface with a ligand capable of reacting with a radioactive isotope in an aqueous solution to form a functionalized substrate surface. The present invention also relates to the optical waveguide sensor for detecting radioactive isotopes fabricated with the method of the present invention.