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Electrochemical imaging system and method based on graphene adjustable light scattering property

An imaging system, graphene technology, applied in the direction of scattering characteristics measurement, material electrochemical variables, methods of obtaining spatial resolution, etc., can solve problems such as failure to break through, and achieve the effect of function and performance improvement

Active Publication Date: 2019-10-25
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Other methods such as ultra-microelectrodes and surface-enhanced Raman scattering have also failed to break through the nanoampere limit

Method used

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  • Electrochemical imaging system and method based on graphene adjustable light scattering property
  • Electrochemical imaging system and method based on graphene adjustable light scattering property
  • Electrochemical imaging system and method based on graphene adjustable light scattering property

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Such as figure 1 , an electrochemical imaging system based on the tunable light scattering properties of graphene, including a graphene electrolytic cell system 1, a microscope system 2, an imaging module 3 and an image processing module 4;

[0047] The graphene electrolytic cell system 1 includes a working electrode 11, a counter electrode 12, a reference electrode 13 and an electrolytic solution 14, and the working electrode 11 is graphene; specifically, the graphene used in this embodiment is a single layer or Few layers (3-5 layers) of graphene grown by CVD, platinum wire as counter electrode, silver / silver chloride as reference electrode, and electrolyte solution as potassium nitrate solution; wherein, graphene electrode can be obtained by other methods, such as evaporation Plating, transfer, growth, etc.; the counter electrode and reference electrode can be replaced by other conductive materials.

[0048] Described graphene electrolytic cell system 1 links to eac...

Embodiment 2

[0058] Using the electrochemical imaging system based on the adjustable light scattering properties of graphene described in Example 1, the electrochemical workstation is used to apply a triangular wave potential with a scan rate of 0.1V / s and a range of -0.3 to 0.3V to the working electrode for cyclic voltammetry scanning.

[0059] Such as image 3 , the image processing module extracts the picture obtained by the imaging module, and obtains the current density of a single gold nanostar by performing calculation processing on the scattered light intensity of the picture;

[0060]

[0061] As shown in the figure, the noise of calculating the current density by the standard deviation is 7.18×10 -4 Am -2 . The near-field scattering cross section of the gold nanostar is 2.10×10 -15 m 2 . Therefore, by calculating the three times the signal-to-noise ratio of the current noise, the detection limit of the current is 4.52 × 10 -18 A, that is 4.52aA.

[0062] Based on the a...

Embodiment 3

[0064] Same as Example 2, the difference is that 1mM potassium ferricyanide is added to the electrolyte, and a triangular wave potential with a sweep rate of 0.1V / s and a range of -0.6 to 0.6V is applied to the working electrode to perform cyclic voltammetry scanning.

[0065] The image processing module extracts the picture obtained by the imaging module, and calculates the scattered light intensity of the picture through the following formula to obtain the local current density representing the target sample, and realize the imaging analysis of the electrochemical reaction on a single nanostar;

[0066]

[0067] At the same time, the macroscopic cyclic voltammetry curve collected by the graphene electrolytic cell system.

[0068] Such as Figure 4 a-d, when the potential is -0.6V, there is no obvious current on the surface of the gold nanostar. When the potential is swept to 0.12V, there is the largest oxidation current, and then gradually disappears, and the reduction cu...

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Abstract

The invention belongs to the optical microscope instrument manufacturing technology and electrochemical imaging technology field and especially relates to an electrochemical imaging system and methodbased on a graphene adjustable light scattering property. The system comprises a graphene electrolytic cell system, a microscope system, an imaging module and an image processing module. The grapheneelectrolytic cell system uses graphene as a working electrode. The microscope system and the imaging module are arranged on a scattered light path of the graphene electrolytic cell system. The image processing module extracts a picture obtained by the imaging module, and carries out operation processing on picture scattered light intensity to obtain the picture representing local surface Faraday and non-faradaic current densities of a target sample so as to realize electrochemical imaging. By using the electrochemical imaging method based on the graphene adjustable light scattering property, local surface electrochemical signals of the multiple target samples in a field of view can be detected simultaneously, sensitivity of current collection is reduced from a nanoampere level in the priorart to an angstrom ampere level by a matched scattering imaging system, and a spatial resolution is significantly improved.

Description

technical field [0001] The invention belongs to the fields of optical microscopic instrument manufacturing technology and electrochemical imaging technology, and in particular relates to an electrochemical imaging system and method based on adjustable light scattering properties of graphene. Background technique [0002] Electrochemical analysis technology is a widely used analysis method, which can be used to detect and understand the electrochemical reactions occurring on the electrode surface, and thus has received extensive attention. In order to obtain better detection sensitivity and spatial resolution, researchers have developed numerous electrochemical microscopy imaging analysis methods, which are commonly divided into two categories: scanning electrochemical microscopy (SECM) and plasma electrochemical microscopy (P-ECi). ). The scanning electrochemical microscope scans the surface of the sample through microelectrodes to obtain local current signals. Plasma elec...

Claims

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Application Information

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IPC IPC(8): G01N27/30G01N27/48G01N21/75G01N21/47G01N21/51G01N21/17
CPCG01N27/308G01N27/305G01N27/48G01N21/75G01N21/47G01N21/4795G01N21/51G01N21/17G01N2021/4735G01N2021/4797G01N2021/1765G01N2021/178G01N2021/1789
Inventor 陈子轩朱俊杰
Owner NANJING UNIV
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