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 coating layers, agglomeration due to silylating agents, and inability to detect both radioactive ions and isotopes, while being bulky and costly.
Innovation Solution
A method for fabricating an optical waveguide sensor using crosslinking agents, scintillating agents, and ligands on silica or silicon substrates, avoiding silylating agents, and employing esterification and amine conjugation to form uniform layers, enabling detection of radioactive isotopes by measuring changes in optical refractive index.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If silylating agents are used to coat the substrate surface, then the coating process can be simplified, but the coating layer becomes non-uniform due to agglomeration
Solution Approach 1:
The patent changes the chemical parameters of the coating process by replacing silylating agents with silane crosslinking agents under controlled pH and temperature conditions. This parameter change prevents agglomeration while maintaining ease of manufacture, resolving the contradiction between process simplicity and coating uniformity.
Solution Approach 2:
The patent introduces an intermediary crosslinking step using silane crosslinking agents that mediate between the substrate and the scintillating/fluorescent material. This intermediary layer ensures uniform distribution and prevents direct agglomeration, achieving both manufacturing simplicity and coating precision.
2Productivity
If thin-film coating is used for detection, then the sensor size is reduced and response time is improved, but the coating layer becomes non-uniform
Solution Approach 1:
The patent optimizes coating parameters including solvent composition, coating thickness, and curing conditions to achieve uniform thin-film layers. By controlling these parameters, the patent maintains fast response time characteristics of thin-film sensors while eliminating the non-uniformity problem.
3Reliability
If current sensor designs are used, then detection of radioactive ions is possible, but the sensors are bulky and costly to fabricate
Solution Approach 1:
The patent merges multiple functions into a single integrated sensor platform by combining the substrate, crosslinking layer, scintillating/fluorescent materials, and detection capabilities in one compact device. This merging eliminates the need for separate components, reducing size and fabrication complexity while maintaining detection reliability.
Solution Approach 2:
The patent creates a universal sensor platform that can detect both radioactive ions and isotopes using the same basic structure and materials. This multi-functionality reduces the need for multiple specialized sensors, thereby reducing overall device complexity and cost while maintaining reliable detection.
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, allowing for mass production and environmental sustainability.
Implementation Method 1
coating the crosslinked substrate surface with a scintillating agent for forming a substrate surface containing scintillating agent
Implementation Method 2
the scintillating agent to be selected from a group comprising a fluorescent crosslinker complex selected from a group comprising a hydroxyl functional group containing organic molecules complexed with ions selected from a group comprising Europium ions, Eu 3+
Implementation Method 3
for detecting radioactive isotopes by measuring changes in optical refractive index
Data Source
Figure 1
Figure 2
Figure 3A~3B
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 comprising the steps of treating a substrate surface by cleaning the substrate surface with one or more solvents for enabling coating of the treated surface with a crosslinking agent, the substrate being selected from a group comprising a silica or a silicon substrate, 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, coating the crosslinked substrate surface with a scintillating agent for forming a substrate surface containing scintillating agent, and coating the substrate surface containing scintillating agent with a ligand capable of reacting with a radioactive isotope in an aqueous solution for forming a functionalized substrate surface, thereby forming the optical waveguide sensor comprising a layer of the ligand and the scintillating agent. The present invention also relates to the optical waveguide sensor for detecting radioactive isotopes fabricated with the method of the present invention.