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High-resolution imaging device for nano material and imaging analysis method of high-resolution imaging device

An imaging device and nanomaterial technology, applied in the direction of material electrochemical variables, scattering characteristics measurement, etc., can solve the problems of reduced system detection throughput, low detection throughput, low spatial resolution, etc.

Active Publication Date: 2021-09-10
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004]1) Low detection throughput: Due to the interference of plasma waves in traditional plasmon resonance imaging, the nanoparticles produce a parabolic tail on the image, and the tail is Hundreds or even thousands of times the actual particle cross-section, the tail stripes of different particles overlap and interfere with each other, which greatly reduces the detection throughput of the system;
[0005]2) Low spatial resolution: For one-dimensional and two-dimensional nanomaterials, due to the interference of irregular tails, the acquisition of information such as their true shape is affected, resulting in Traditional techniques are difficult to study the distribution difference of active sites in the catalytic process of nanomaterials

Method used

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  • High-resolution imaging device for nano material and imaging analysis method of high-resolution imaging device
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Embodiment 1

[0063] The present invention provides a high-throughput and high-resolution imaging method for nanomaterials (including zero-dimensional nanoparticles, one-dimensional nanowires, and two-dimensional nanosheet materials, etc.). The following uses Ag nanowires as an example to explore the methods used in the present invention. The devices and methods involved, and the experimental program include:

[0064] Synthesis of Ag nanowires: The Ag nanowires used in the present invention are synthesized in two steps:

[0065] 1) Synthesis of AgCl: at 800 rpm, AgNO 3 The solution (5 mL, 0.5 M) was mixed with NaCl solution (5 mL, 1M) for 1 min; the precipitate was separated from the supernatant, washed with ultrapure water and dried in vacuum;

[0066] 2) Synthesis of Ag nanowires: Dissolve 0.34 g of PVP in ethylene glycol (20 mL) and heat to 160 °C at 800 rpm; after the temperature of the solution is stable, add 25 mg of freshly prepared AgCl at one time, The solution turned bright yell...

Embodiment 2

[0069] Such as image 3 , the present invention provides a method for high-resolution imaging of the electrochemical activity of a single silver (Ag) nanowire, and the steps of the determination method include:

[0070] Disperse the Ag nanowires on the Au film (23), build the electrochemical cell device, and set the parameters of the X / Y scanning galvanometer device (32) through the software control module (41);

[0071] Connect the electrochemical workstation (11), set the electrochemical test parameters, and record the optical signal and the current signal synchronously through the software control module (41).

[0072] Such as image 3 A, the oxidation peak and reduction peak begin to appear at around +0.05 V and -0.05 V (relative to Ag / AgCl reference), which is consistent with the oxidation-reduction potential of Ag under this condition reported in the literature, confirming that Ag nanowires have Electrochemical redox reactions.

[0073] Such as image 3 B, When a sin...

Embodiment 3

[0076] The present invention provides a method for high-throughput analysis and identification of different types of nanoparticles by using the difference in electrochemical activity. The following is an example of Au nanoparticles (100 nm) and Ag (100 nm) nanoparticles of the same size. Steps include:

[0077] Firstly, the Ag nanoparticles are dispersed and coated on the Au film (23 nm), the device is built, and the image is collected; the dispersed Au nanoparticles are added, and the image is collected; the two images are subtracted to determine the positions of the two particles; Connect to the electrochemical workstation (11) and set the electrochemical test parameters, and record the current signal and image signal through the software control module (41) for analysis.

[0078] Such as Figure 4 A, After completing the cyclic voltammetry (-0.2 V, +0.2 V) scan, under the same field of view, the optical signal of Au nanoparticles (green) has no obvious change, but the opti...

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Abstract

The invention provides a high-resolution imaging device for a nanometer material. The high-resolution imaging device comprises a nanometer electrochemical control module, a high-resolution electrochemical imaging module and a control module, wherein the nanometer electrochemical control module comprises an electrochemical workstation and an electrochemical cell, and the electrochemical cell comprises a working electrode and a three-electrode device. The invention also provides a method for analyzing the single-particle horizontal nano material by using the high-resolution imaging device. According to the invention, a high-resolution surface plasma coherent scattering imaging device is used for imaging and analyzing different sites of a nano material in a single-particle horizontal reaction process; and the device has the advantages of high sensitivity, non-invasiveness and the like, can perform in-situ imaging analysis on chemical activity and electrochemical activity of different nano materials, and provides important guarantee for high-throughput screening.

Description

technical field [0001] The invention relates to the technical field of environmental nanocatalysis and single particle analysis, in particular to a high-resolution imaging device for nanomaterials and a method for analyzing nanomaterials using the high-resolution imaging device. Background technique [0002] The role of environmental nanotechnology in pollution prevention and control has attracted more and more attention, and the catalytic conversion of pollutants by nanoparticles is one of the important applications of environmental nanotechnology. The catalytic activity of nanomaterials is affected by factors such as particle size, structure, morphology, and composition. Therefore, constructing the structure-activity relationship of nanomaterials at the scale of individual nanoparticles is of great significance for understanding the environmental catalytic behavior of materials. However, there is still a lack of technology and means to observe the catalytic behavior of sin...

Claims

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Application Information

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IPC IPC(8): G01N27/26G01N21/49
CPCG01N27/26G01N21/49
Inventor 刘贤伟吴刚钱晨
Owner UNIV OF SCI & TECH OF CHINA
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