Nanostructure Mass Sensor Resonant Frequency Shift
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Solution Overview
Problem
Current mass sensors are not efficient in determining the mass of small particles or molecules, such as bio-molecules, due to limitations in sensitivity and accuracy, particularly in measuring minute mass quantities.
Innovation Solution
A mass sensor system utilizing nanostructures on a substrate, where the mechanical-electromagnetic resonant frequency changes upon attachment of a particle, allowing for the determination of mass by measuring the difference in resonant frequencies before and after particle attachment, using electromagnetic waves and an ellipsometer to analyze the nanostructures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional mass sensors (quartz crystal microbalance, microcantilever, surface acoustic wave) are used, then mass measurement capability is provided, but sensitivity and accuracy for small particles or molecules are insufficient
Solution Approach 1:
The sensor divides the measurement function across multiple independent nanostructures (nanowires, nanotubes, or nanopillars) arranged in an array on the substrate. Each nanostructure can independently interact with particles, and their collective response enhances the overall measurement sensitivity and reliability for detecting small mass changes.
Solution Approach 2:
The invention transitions from conventional bulk or micro-scale sensing elements to nano-scale structures with at least one dimension in the 1-100 nm range. This dimensional reduction at the nanoscale enables significantly higher surface-to-volume ratios and enhanced sensitivity for detecting small particles and molecules, directly addressing the limitation in measurement precision.
2Measurement precision
If nanostructures with dimensions in the range of 1 to 100 nanometers are used, then sensitivity for detecting small particles is improved, but device complexity increases
Solution Approach 1:
The nanostructures are designed with universal geometric shapes (nanowires, nanotubes, or nanopillars) that can be fabricated using standardized techniques and serve multiple functions: mechanical resonance sensing, particle capture, and signal transduction. This universal design reduces fabrication complexity while maintaining high sensitivity across different particle types and masses.
Solution Approach 2:
The invention optimizes specific parameters of the nanostructures, including their dimensions (1-100 nm scale), aspect ratios, and material compositions, to achieve resonant frequencies that are highly sensitive to particle mass while remaining compatible with existing nanofabrication processes. By carefully selecting and controlling these parameters, the system achieves high measurement precision without proportionally increasing fabrication complexity.
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
Enables cost-effective and precise measurement of small molecule masses, suitable for applications like biosensing and detecting bio-molecules, drug molecules, and short DNA/RNA sequences with high sensitivity.
Implementation Method 1
The nanostructures and the substrate have a mechanical-electromagnetic resonant frequency such that a resonance occurs when the nanostructures and the substrate are irradiated by an electromagnetic wave having a frequency substantially equal to the mechanical-electromagnetic resonant frequency
Data Source
AI summary
A mass sensor is provided for determining the mass of small objects. The mass sensor has a plurality of nanostructures attached to a substrate. The nanostructures and the substrate are irradiated with an electromagnetic wave to determine a first mechanical-electromagnetic resonant frequency of the mass sensor. After a particle is attached to the nanostructures, the substrate and the nanostructures to which the particle is attached are irradiated with an electromagnetic wave to determine a second mechanical-electromagnetic resonant frequency of the mass sensor. A mass of the particle is determined based on a difference between the first and second mechanical-electromagnetic resonant frequencies.