A Photoelectrochemical Sensor of Irradiation Modified Bismuth Vanadate Aptamer
A photoelectrochemical, non-toxic bismuth vanadate technology, applied in the field of photoelectrochemistry, can solve the problems of poor material stability, large sensor background signal, poor photoelectric performance, etc., to achieve reduced recombination, high sensitivity and resolution, and improved photoelectric response Effect
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Embodiment 1
[0048] In this example, the photoelectrochemical anodic oxidation method is used to prepare BiVO on the conductive substrate first. 4 thin film, using infrared light to irradiate BiVO 4 Get Laser-BiVO 4 thin films, and then respectively in BiVO 4 and Laser-BiVO 4 Modified g-C on the film 3 N 4 Thin films, using g-C 3 N 4 Surface π-π adsorption of thin films immobilizes DNA aptamers for prostate-specific antigen PSA on g-C 3 N 4 On the thin film, the PEC aptamer sensor BiVO for the detection of prostate specific antigen PSA was prepared 4 / g -C 3 N 4 / PSA enhanced aptasensor and Laser-BiVO 4 / g -C 3 N 4 / PSA inhibitory aptasensor, the specific preparation process is as follows:
[0049] (1) Clean the surface of the FTO conductive glass (2cm × 1cm × 0.2cm) with a piranha solution configured with a mixture of concentrated sulfuric acid and 30% hydrogen peroxide (mass ratio is 7:3), then rinse repeatedly with ultrapure water and Blow dry with high-purity nitrogen fo...
Embodiment 2
[0078] In this example, the same method as in Example 1 was used to prepare a PEC aptamer sensor for detecting carcinoembryonic antigen CEA——BiVO 4 / g -C 3 N 4 / CEA Enhanced Aptasensor and Laser-BiVO 4 / g -C 3 N 4 / CEA inhibitory aptasensor, the specific preparation process is as follows:
[0079] (1) Clean the surface of the FTO conductive glass (2cm × 1cm × 0.2cm) with a piranha solution configured with a mixture of concentrated sulfuric acid and 30% hydrogen peroxide (mass ratio is 7:3), then rinse repeatedly with ultrapure water and Blow dry with high-purity nitrogen for later use;
[0080] (2) Weigh 2.9g Bi(NO 3 ) 3 ·5H 2 O and 12g NaI were dissolved in 200mL ultra-pure water and fully stirred and mixed. After the solution was clarified and uniform, the pH of the solution was adjusted to 1.2. 2.85g p-benzoquinone was dissolved in 90mL ethanol, and the p-benzoquinone was fully dissolved by ultrasonication for 30min, and then Mix the two solutions, stir for 30 minu...
Embodiment 3
[0092] In this example, the same method as in Example 1 was used to prepare a PEC aptamer sensor for detecting alpha-fetoprotein AFP——BiVO 4 / g -C 3 N 4 / AFP enhanced aptasensor and Laser-BiVO 4 / g -C 3 N 4 / AFP inhibitory aptasensor, the specific preparation process is as follows:
[0093] (1) Clean the surface of the FTO conductive glass (2cm × 1cm × 0.2cm) with a piranha solution configured with a mixture of concentrated sulfuric acid and 30% hydrogen peroxide (mass ratio is 7:3), then rinse repeatedly with ultrapure water and Blow dry with high-purity nitrogen for later use;
[0094] (2) Weigh 2.9g Bi(NO 3 ) 3 ·5H 2 O and 12g NaI were dissolved in 200mL ultra-pure water and fully stirred and mixed. After the solution was clarified and uniform, the pH of the solution was adjusted to 1.2. 2.85g p-benzoquinone was dissolved in 90mL ethanol, and the p-benzoquinone was fully dissolved by ultrasonication for 30min, and then Mix the two solutions, stir for 30 minutes unt...
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