Sputtered Platinum Biosensor Probes for H2O2 Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for manufacturing needle-implantable glucose biosensors, such as electroplating platinum, are expensive, time-consuming, and prone to batch-to-batch variability, limiting the sensitivity and accuracy of H2O2 detection for continuous glucose monitoring.
Innovation Solution
The method involves sputtering a platinum layer onto a base substrate at higher pressures and powers than conventional sputtering, forming a surface-roughened platinum layer that enhances H2O2 sensitivity comparable to electroplated layers, while being a continuous and cost-effective process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electroplating platinum is used to form the working electrode, then high sensitivity to H2O2 is achieved, but manufacturing cost increases and batch-to-batch variability occurs
Solution Approach 1:
The patent changes the sputtering parameters (pressure increased to at least 30 mtorr, power increased to at least 100 Watts) to achieve a surface-roughened platinum layer that provides high H2O2 sensitivity comparable to electroplated layers, while eliminating batch-to-batch variability and reducing manufacturing cost through a continuous process
Solution Approach 2:
The patent replaces the electrochemical electroplating process with a physical vapor deposition sputtering process, substituting a chemical/electrochemical system with a physical system that offers better process control, continuity, and reduced variability while achieving comparable or superior sensitivity
2Ease of manufacture
If conventional sputtering is used to form platinum layer, then manufacturing cost is reduced, but H2O2 sensitivity is insufficient
Solution Approach 1:
The patent modifies conventional sputtering by increasing the pressure to at least 30 mtorr and power to at least 100 Watts, which transforms the deposition process to create a surface-roughened platinum layer with enhanced H2O2 sensitivity, thereby achieving both cost-effectiveness and high sensitivity
3Measurement precision
If electroplating process is used, then high H2O2 sensitivity is achieved, but manufacturing time increases due to batch processing
Solution Approach 1:
The patent implements a continuous sputtering process where the plasma source continuously deposits platinum onto the needle implant as it passes through the chamber, eliminating the batch-to-batch nature of electroplating and enabling high-volume manufacturing with consistent sensitivity across all probes
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
This approach results in a biosensor probe with improved H2O2 sensitivity, reduced manufacturing costs, and increased scalability, achieving comparable sensitivity to electroplated platinum without the drawbacks of conventional sputtering.
Implementation Method 1
forming a platinum layer overlying the base substrate by sputtering platinum
Data Source
AI summary
Systems and methods for forming probes for a biosensor. In the systems and methods disclosed herein, a base substrate is provided; and a platinum layer is formed on the base substrate by sputtering platinum in the absence of oxygen. The platinum layer is formed using a sputtering pressure of at least 30 mtorr.