Hybrid Polymer Sensor with Nanoparticles for Picomolar Detection

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Solution Overview

Problem

Current biosensor technologies, particularly porous silicon (PSi) sensors, face limitations in achieving high sensitivity for detecting small molecular weight targets due to small refractive index changes and challenges with signal amplification, steric crowding, and baseline drift, which hinder their effectiveness in clinical and point-of-care (POC) diagnostic applications.

Innovation Solution

The development of a hybrid target-responsive polymer sensor incorporating high refractive index nanoparticles within a polymer matrix that undergoes detectable refractive index changes upon target molecule binding, enhancing sensitivity and enabling visual colorimetric readout.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If porous silicon sensors are used for detecting small molecular weight targets, then the sensor structure provides high surface area and intrinsic filtering properties, but the refractive index changes are too small to achieve high sensitivity

Engineering Contradiction:

Improvedetection sensitivityVSAvoidsignal amplification complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent combines porous silicon with polymer matrices and high refractive index nanoparticles to create a composite sensing system. The porous silicon provides structural support and filtering, the polymer matrix enables target-responsive swelling, and the high refractive index nanoparticles amplify the optical signal, collectively achieving high detection sensitivity without excessive complexity

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent exploits changes in the physical parameters of the polymer matrix (swelling and deswelling) in response to target binding. These parameter changes modulate the refractive index environment around the high refractive index nanoparticles, amplifying the optical signal and enabling sensitive detection of small molecular weight targets

Inventive Principle:

Principle #35Parameter changes

2Reliability

If traditional porous silicon sensors are used, then fabrication is inexpensive and control of pore morphology is precise, but baseline drift and steric crowding hinder reliability

Engineering Contradiction:

Improvedetection reliabilityVSAvoidsensor structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent utilizes the porous structure of silicon as a foundation but modifies it by filling pores with polymer matrices containing high refractive index nanoparticles. This maintains the benefits of porous silicon (inexpensive fabrication, precise pore morphology control) while adding functionality to reduce baseline drift and steric crowding effects through the polymer's responsive swelling behavior

Inventive Principle:

Principle #31Porous materials

Solution Approach 2:

The polymer matrix acts as an intermediary between the porous silicon substrate and the target molecules. It provides a responsive medium that amplifies binding events through swelling, reducing baseline drift by isolating the silicon from direct contact with complex samples, and minimizing steric crowding by distributing binding sites throughout the polymer network

Inventive Principle:

Principle #24Intermediary (Mediator)

3Measurement precision

If high refractive index nanoparticles are incorporated into the polymer matrix, then optical signal is significantly amplified for detecting picomolar concentrations, but the device complexity increases

Engineering Contradiction:

Improvedetection sensitivityVSAvoidfabrication simplicity

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

The patent merges the synthesis of high refractive index nanoparticles with the polymerization of the matrix in a single integrated process. This combining of steps simplifies fabrication despite the advanced functionality achieved, as the nanoparticles are incorporated during matrix formation rather than requiring separate assembly steps

Inventive Principle:

Principle #5Merging (Combining)

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 significantly amplifies the refractive index change, allowing for the detection of small molecular weight targets at picomolar concentrations, overcoming previous limitations of PSi sensors and enabling rapid, reliable, and inexpensive POC diagnostics.

Implementation Method 1

one or more high refractive index nanoparticles within the polymer matrix; wherein a detectable change occurs in a refractive index of the polymer matrix when contacted with one or more target molecules

Methodology Applied

Scientific EffectRefraction: Refraction

Data Source

PatentUS8841137B2Hybrid target analyte responsive polymer sensor with optical amplification

Publication Date: 2014.09.23 UNIVERSITY OF ROCHESTER

AI summary

Disclosed is a product that includes an optical sensor; a target-responsive hydrogel matrix on a surface of the optical sensor (where the hydrogel matrix comprises one or more target-specific receptors and one or more target analogs), and one or more high refractive index nanoparticles within the hydrogel matrix, where a detectable change occurs in a refractive index of the hydrogel matrix when contacted with one or more target molecules. Sterile packages and detection devices containing the product, and methods of detecting a target molecule using the product, are also disclosed.