CN217605732U - Micro-fluidic photoelectrochemical sensor - Google Patents
Micro-fluidic photoelectrochemical sensor Download PDFInfo
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- CN217605732U CN217605732U CN202220713801.2U CN202220713801U CN217605732U CN 217605732 U CN217605732 U CN 217605732U CN 202220713801 U CN202220713801 U CN 202220713801U CN 217605732 U CN217605732 U CN 217605732U
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Abstract
The application belongs to the field of photoelectrochemical sensing, and discloses a microfluidic photoelectrochemical sensor, which is sequentially configured as follows: the liquid detection device comprises a detection window for placing liquid to be detected, a liquid inlet channel and a liquid outlet channel which are respectively arranged on the opposite side walls of the detection window, a working electrode and a counter electrode which are positioned in two grooves at the bottom in the detection window, and conductive leads which are positioned at the bottom outside the detection window and are respectively connected with the working electrode and the counter electrode; and the transparent cover plate is arranged at the top of the detection window. The working electrode is further configured to be a titanium dioxide base layer, a copper oxide layer deposited on the surface of the titanium dioxide base layer, and a gold particle layer plated on the surface of the copper oxide layer. The working electrode pair has high reusability and stability for detecting the same liquid to be detected, and can select a proper working electrode according to the liquid to be detected, so that the different liquids to be detected can be detected in real time, on line and accurately.
Description
Technical Field
The utility model belongs to photoelectrochemistry sensing field especially relates to a photoelectrochemistry micro-fluidic sensor.
Background
At present, the technology of the photoelectrochemical sensing chip is relatively mature, and various photoelectrochemical sensing chips are available. However, the detection of the liquid to be detected is based on a large dose, and the working electrode cannot be replaced at will according to the difference of the liquid to be detected, so that how to detect the liquid to be detected with a small dose in a fast and accurate manner is still an unsolved technical problem.
With the advent of microfluidic technology, there has been a relatively simple way to implement detection of a liquid to be detected, such as the recent photoelectrochemical microfluidic chip. The chip of the type is mainly prepared by coating solution, then air-drying to prepare a microelectrode, then integrating the microelectrode with a microfluidic chip, applying light, and indirectly obtaining the concentration of the liquid to be detected by detecting a current signal generated by the microelectrode. However, the micro-electrode prepared by applying and air-drying the solution has poor stability, and the micro-working electrode prepared by applying and air-drying the solution is consumed during the detection process, so that the reusability and the stability are insufficient. In addition, the working electrode can not be independently and freely replaced, the whole microfluidic chip needs to be replaced when different liquids to be detected are detected, the cost is high, and the real-time accurate detection of the different liquids to be detected is not facilitated.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a technical problem that solve can be through waiting to examine the circulation of liquid, light excitation's mode carries out real-time detection to waiting to examine liquid to can freely change working electrode alone, be favorable to waiting to examine liquid to the difference and carry out real-time, online, accurate detection. In order to achieve the above purpose, the utility model adopts the following technical scheme:
a microfluidic photoelectrochemical sensor is sequentially configured from top to bottom as follows: the liquid detection device comprises a detection window for placing liquid to be detected, a liquid inlet channel and a liquid outlet channel which are respectively arranged on the opposite side walls of the detection window, a working electrode and a counter electrode which are positioned in two grooves at the bottom in the detection window, and a conductive lead which is positioned at the outer bottom of the detection window and is respectively connected with the working electrode and the counter electrode; and the transparent cover plate is arranged at the top of the detection window.
When the micro-flow control photoelectrochemical sensor is used, firstly, a transparent cover plate at the top is opened, a proper working electrode is selected to be placed in a groove according to liquid to be detected, then, illumination is applied to the vertical direction of the top of the sensor, the liquid to be detected is injected into a detection window through a liquid inlet channel and fills the whole detection window as far as possible, and the liquid to be detected is enabled to be fully contacted with the working electrode and a counter electrode which are positioned at the bottom in the detection window; the working electrode and the counter electrode are used for capturing a current signal generated in the liquid to be detected, and the liquid to be detected is discharged from the liquid outlet channel after the signal capturing is finished; and when the working electrode needs to be replaced, the transparent cover plate is opened, and the working electrode in the groove is directly replaced.
Compared with the prior art, the effect of this application is as follows:
1. the reusability and the stability of the working electrode for detecting the same liquid to be detected are high.
2. The transparent cover plate at the top is opened, and a proper working electrode can be selected to be placed in the electrode groove according to the liquid to be detected, so that real-time, online and accurate detection of different liquids to be detected can be realized.
Drawings
Fig. 1 is a structural diagram of a microfluidic photoelectrochemical sensor.
Fig. 2 is a top view of a microfluidic photoelectrochemical sensor.
Fig. 3 is a bottom view of a microfluidic photo-electrochemical sensor.
FIG. 4 is a diagram of a detection window of the micro-fluidic photo-electrochemical sensor.
In the figure: 1. liquid inlet channel, 2, working electrode, 3, counter electrode, 4, conductive lead, 5, liquid outlet channel, 6, detection window, 7, transparent cover plate.
Detailed Description
The invention will be further described with reference to the following drawings and examples:
examples
A microfluidic photoelectrochemical sensor as shown in fig. 1 to 4, configured in sequence from top to bottom: the liquid detection device comprises a detection window 6 for placing liquid to be detected, a liquid inlet channel 1 and a liquid outlet channel 5 which are respectively arranged on the opposite side walls of the detection window, a working electrode 2 and a counter electrode 3 which are positioned in two grooves at the bottom in the detection window, and a conductive lead 4 which is positioned at the bottom outside the detection window and is respectively connected with the working electrode and the counter electrode; and the transparent cover plate 7 is arranged at the top of the detection window.
Two places that the bottom set up in the detection window should match with working electrode, counter electrode with the size of recess cross-sectional shape that the bottom set up respectively is used for placing working electrode, counter electrode, can open the apron and put into the electrode and can realize changing in the recess when using. The sensor of the working electrode can be freely replaced, and real-time, online and accurate detection of different liquids to be detected is facilitated.
Preferably, the transparent cover plate is detachably assembled on the top of the detection window.
The working electrode is of a composite layer type structure and is configured to be a titanium dioxide base layer, a copper oxide layer deposited on the surface of the titanium dioxide base layer and a gold particle layer plated on the surface of the copper oxide layer. In the structure, a heterojunction is formed between the titanium dioxide layer and the copper oxide layer, the recombination of current carriers is further reduced, and the gold particle layer is used as a noble metal, so that the gold particle layer has good physical and chemical properties, the photocurrent can be further increased, and the sensitivity of a working electrode is increased.
Preferably, a platinum electrode is used as the counter electrode.
Preferably, the detection window and the transparent cover plate are made of PDMS polymer materials. The PDMS polymer material is a biocompatible organic high molecular polymer and has good permeability under light irradiation.
Adopt the technical scheme of the utility model, can detect waiting to detect liquid through the mode of injecting waiting to detect liquid to the mode is light drive, separates with the internal arrangement, and can freely change working electrode alone, is favorable to the real-time accurate detection to waiting to detect liquid.
Claims (5)
1. A microfluidic photoelectrochemical sensor, comprising: the following components are arranged from top to bottom: the liquid detection device comprises a detection window for placing liquid to be detected, a liquid inlet channel and a liquid outlet channel which are respectively arranged on the opposite side walls of the detection window, a working electrode and a counter electrode which are positioned in two grooves at the bottom in the detection window, and conductive leads which are positioned at the bottom outside the detection window and are respectively connected with the working electrode and the counter electrode; and the transparent cover plate is arranged at the top of the detection window.
2. A microfluidic photoelectrochemical sensor according to claim 1, wherein: the transparent cover plate is detachably assembled at the top of the detection window.
3. A microfluidic photoelectrochemical sensor according to claim 1, wherein: the working electrode is of a composite layer structure and is configured into a titanium dioxide substrate layer, a copper oxide layer deposited on the surface of the titanium dioxide substrate layer and a gold particle layer plated on the surface of the copper oxide layer.
4. A microfluidic photoelectrochemical sensor according to claim 1, wherein: the counter electrode is a platinum electrode.
5. A microfluidic photoelectrochemical sensor according to claim 1, wherein: the detection window and the transparent cover plate are made of PDMS polymer materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220713801.2U CN217605732U (en) | 2022-03-29 | 2022-03-29 | Micro-fluidic photoelectrochemical sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220713801.2U CN217605732U (en) | 2022-03-29 | 2022-03-29 | Micro-fluidic photoelectrochemical sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217605732U true CN217605732U (en) | 2022-10-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220713801.2U Active CN217605732U (en) | 2022-03-29 | 2022-03-29 | Micro-fluidic photoelectrochemical sensor |
Country Status (1)
| Country | Link |
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| CN (1) | CN217605732U (en) |
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2022
- 2022-03-29 CN CN202220713801.2U patent/CN217605732U/en active Active
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