Achromatic Colorimetric Nanosensor Using Complementary Metal Particles
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Solution Overview
Problem
Conventional colorimetric nanosensors using metallic nanoparticles face challenges in detecting analytes due to small color changes between chromatic colors, making it difficult to identify reaction conditions and detect multiple analytes simultaneously, as the color changes are not easily noticeable with the naked eye.
Innovation Solution
An achromatic colorimetric sensor is developed using a mixture of complementary colored metallic nanoparticles that change from an achromatic color to multiple chromatic colors upon analyte interaction, enhancing color contrast and brightness for clearer detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional colorimetric nanosensors use single-type metallic nanoparticles, then the sensor structure is simple, but the color change is not easily noticeable due to small differences in contrast and brightness
Solution Approach 1:
The patent combines multiple types of metallic nanoparticles with complementary colors (e.g., red gold nanoparticles and green silver nanoparticles) into a single sensor system. This merging creates an achromatic mixture that produces a stark white-to-color contrast when analytes are detected, dramatically improving color change detectability while maintaining reasonable structural complexity
Solution Approach 2:
The patent creates a composite nanoparticle system where different metallic nanoparticles (Au, Ag, Cu, etc.) with complementary colors are mixed in specific ratios. This composite approach enables the sensor to exhibit achromatic properties in its baseline state while producing vivid chromatic changes upon analyte interaction, resolving the contradiction between structural simplicity and detection clarity
2Device complexity
If conventional colorimetric nanosensors use single-type metallic nanoparticles, then the sensor design is simple, but multiplexed detection of various analytes is difficult
Solution Approach 1:
The patent designs a universal nanoparticle mixture system where multiple nanoparticle types with different analyte-specific coatings coexist in the same sensor. Each nanoparticle type responds to different analytes, enabling multiplexed detection within a single simple sensor design. The achromatic background ensures all color changes are equally detectable
Solution Approach 2:
The patent segments the detection function across multiple nanoparticle types, each specialized for detecting specific analytes through surface-functionalized coatings. This segmentation allows simultaneous detection of multiple analytes in a single measurement, achieving multiplexed detection without significantly complicating the overall sensor design
3Device complexity
If conventional colorimetric nanosensors rely on small color changes between chromatic colors, then the nanoparticle system is simple, but immediate determination with naked eye is limited
Solution Approach 1:
The patent fundamentally changes the color change mechanism from subtle chromatic-to-chromatic transitions to stark achromatic-to-chromatic transitions. The nanoparticle mixture initially appears white or achromatic, and upon analyte detection, produces vivid colored changes that are immediately apparent to the naked eye, eliminating determination time delays
Solution Approach 2:
The patent changes the fundamental parameter of color contrast from low (subtle chromatic differences) to high (stark achromatic-to-chromatic transition). By adjusting the nanoparticle composition ratios and selecting complementary color combinations, the system achieves maximum contrast for immediate visual detection, resolving the time loss issue
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 achromatic colorimetric sensor enables immediate and clear analysis of target analytes with the naked eye and allows for multiplexed detection of various analytes by transforming from an achromatic to multiple chromatic colors, providing a novel sensing platform for concurrent detection.
Implementation Method 1
A metallic nanoparticle exhibits a specific color due to a strong surface plasmon absorption
Implementation Method 2
The sensor composed of complementary colored nanoparticles will initially have achromatic color by using a mixture of plural complementary colored nanoparticles based on a subtractive mixing method to render an achromatic color
Data Source
AI summary
The present disclosure provides an achromatic colorimetric nanosensor, by using a mixture of nanoparticles with complementary colors. The color changes from an achromatic color to a chromatic color enables more clear color-transition and, thus, allows immediate analysis of the presence of a target analyte. Further, the present disclosure provides achromatic colorimetric nanosensor for detection of multiple analytes using plural nanoparticles via color changes from an achromatic to multiple chromatic colors.