Nanostructure Surface Charge Measurement via Nanoparticle Spraying
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Solution Overview
Problem
Current methods, such as electrostatic force microscopy (EFM), face challenges in quantitatively determining the surface charge distribution of nanostructures, particularly for 1-D nanomaterials, as they are time-consuming and inefficient in scanning large-scale surfaces.
Innovation Solution
A method involving the use of charged nanoparticles and vapor condensation to visualize the surface electric field distribution of nanostructures using an optical microscope, where charged nanoparticles are sprayed onto an insulated nanostructure sample, and vapor is blown to observe their distribution, allowing for the calculation of surface charge distribution through the measurement of dark strip width and voltage relationships.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrostatic force microscopy (EFM) is used to characterize surface charge distribution, then measurement precision is improved, but productivity deteriorates due to slow scanning process
Solution Approach 1:
The patent replaces the mechanical scanning system of EFM with a vapor condensation-based optical detection system. Charged nanoparticles are sprayed onto the sample surface, and vapor condensation patterns are imaged using an optical microscope, eliminating the need for slow mechanical probe scanning while maintaining measurement capability.
Solution Approach 2:
The patent creates a visual copy of the electric field distribution through vapor condensation patterns. The charged nanoparticles and vapor condensation effectively copy the surface charge distribution into an observable optical image, allowing rapid characterization without direct probe measurement.
2Measurement precision
If EFM is used for large scaled surface charge distribution analysis, then measurement precision is improved, but loss of time increases due to slow scanning
Solution Approach 1:
The patent enables continuous observation of large-area surface charge distribution through the vapor condensation method. Multiple charged nanoparticles are sprayed across the entire sample surface simultaneously, and the optical microscope captures the full field of view in one image, allowing continuous analysis without the step-by-step scanning required by EFM.
Solution Approach 2:
The patent transitions from the one-dimensional probe scanning path of EFM to a two-dimensional optical imaging approach. The vapor condensation patterns provide spatial information across the entire sample surface in a single measurement, effectively adding a dimensional aspect to the measurement process.
3Measurement precision
If EFM is used to find individual nanostructures, then measurement precision is improved, but productivity deteriorates due to difficulty in locating specimens
Solution Approach 1:
The patent uses optical contrast changes through vapor condensation to highlight charged nanostructures. The condensation patterns create visible differences in the optical image, making it easy to locate and identify individual charged nanostructures without the difficulty of finding them through EFM scanning.
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 method provides a faster and more efficient means to quantify surface charge distribution on nanostructures, overcoming the limitations of existing techniques by enabling precise visualization and calculation of electric field distribution, facilitating better understanding and characterization of nanostructures.
Implementation Method 1
spraying first charged nanoparticles 620 to the insulated layer 614... observing the distribution of the first charged nanoparticles 620
Implementation Method 2
blowing vapor to the insulated layer 614 to observe the distribution of the first charged nanoparticles 620
Data Source
AI summary
The disclosure relates to a method for calculating surface electric field distribution of nanostructures. The method includes the following steps of: providing a nanostructure sample located on an insulated layer of a substrate; spraying first charged nanoparticles to the insulated surface; blowing vapor to the insulated surface and imaging the first charged nanoparticles via an optical microscope, recording the width w between the first charged nanoparticles and the nanostructure sample, and obtaining the voltage U of the nanostructure sample by an equation.