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Method for detecting dopamine by using nanometer tungsten diselenide modified gold electrode photoinduced electrochemical sensor

A photoelectrochemical and tungsten diselenide technology, which is applied in the direction of material electrochemical variables, scientific instruments, instruments, etc., can solve the problems of high cost and complicated operation, and achieve high selectivity, excellent mechanical properties, and large specific surface area. Effect

Active Publication Date: 2019-06-04
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods are complex and costly

Method used

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  • Method for detecting dopamine by using nanometer tungsten diselenide modified gold electrode photoinduced electrochemical sensor
  • Method for detecting dopamine by using nanometer tungsten diselenide modified gold electrode photoinduced electrochemical sensor
  • Method for detecting dopamine by using nanometer tungsten diselenide modified gold electrode photoinduced electrochemical sensor

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Experimental program
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Embodiment 1

[0020] Embodiment 1 potential optimization

[0021] The prepared photochemical sensor may change its own electron transfer system due to the difference in electrode potential, which will have a certain impact on the measurement of photoelectrochemical signals. The photoelectrochemical signals were measured at different working potentials of -0.3V, -0.2V, -0.1V, 0.0V, 0.1V, 0.2V, and 0.3V, respectively. image 3 Response to photoelectrochemical signals at different potentials. The figure on the left shows that when the potential is 0.2V, I and I 0 The ratio is the largest, and the figure on the right shows that 0.2V is I and I 0 The difference is the largest, and the photoelectrochemical signal response is the strongest and stable at the potential of 0.2V, so the final electrode potential is 0.2V.

Embodiment 2

[0022] Example 2 pH optimization

[0023] The electrodes were respectively measured in the buffer solution with pH of 6.5, 7.0, 7.5, 8.0, 8.5 and 9.0 to measure the photoelectrochemical signal. Figure 4 is the photoelectrochemical signal response measured under different pH conditions. It can be seen that the photoelectrochemical signal value reaches the maximum when the pH is 7.5. Therefore, the pH of the detection medium was chosen to be 7.5.

Embodiment 3 2

[0024] The optimization of embodiment 3 tungsten diselenide dosage

[0025] Use a pipette gun to accurately pipette 5 μL, 10 μL, 15 μL, 20 μL, 25 μL, and 30 μL of tungsten diselenide solution and drop-coat it on the gold electrode to measure the photoelectrochemical signal. Figure 5 is the photoelectrochemical signal under different dosages of tungsten diselenide. It can be seen that the photoelectric signal gradually increases when the dosage of tungsten diselenide is 5 μL to 20 μL, and the signal value reaches the maximum when the dosage is 20 μL, but at the same time the blank signal value is also increasing, as can be seen from the right figure, When the dosage of tungsten diselenide is 15 μL and 20 μL respectively, the obtained analytical signal values ​​are the same, so 15 μL is selected as the optimal dosage of tungsten diselenide.

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Abstract

The invention belongs to the analytical chemistry and photoinduced electrochemical sensor field and especially relates to a method for detecting dopamine by using a nanometer tungsten diselenide modified gold electrode photoinduced electrochemical sensor. Dichlorobenzene is used as a stripping agent to ultrasonically strip tungsten diselenide so as to obtain nanometer tungsten diselenide. An electrode is modified and the enhancement effect of the dopamine to a nanometer tungsten diselenide modified electrode photoinduced electrochemical signal is used to realize the testing of high sensitivityof the dopamine. The method is simple and cost is low.

Description

technical field [0001] The invention belongs to the field of analytical chemistry and photoelectrochemical sensors, in particular to a method for preparing a tungsten diselenide modified gold electrode photoelectrochemical sensor for detecting dopamine. In addition, the present invention also relates to a method for measuring dopamine by using the photoelectrochemical sensor. Background technique [0002] Dopamine is a neurotransmitter mainly found in the pituitary gland and hypothalamus. The human body's exercise, eating, endocrine, emotion, etc. are all inseparable from the regulation of dopamine. As a key central neurotransmitter, the pharmacological effects of dopamine are mostly manifested as the effect on adrenergic receptors, specifically the stimulatory effect on the receptor and its periphery. Due to the different effects on different receptors, it can be As the main component of anti-shock drugs, etc., its mechanism is relatively complicated, especially when dopa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/327G01N27/30
Inventor 混旭姚婷李劲松张跃赵继宽钟华张慧
Owner QINGDAO UNIV OF SCI & TECH
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