A kind of preparation method of photoelectrochemical aptamer sensing electrode and its application
A technology of photoelectrochemistry and sensing electrodes, applied in the direction of material electrochemical variables, etc., can solve the problems of long response time, complex instruments, low selectivity and sensitivity, etc., and achieve the effect of low detection cost, simple preparation process and high sensitivity
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Embodiment 1
[0030] (1) The preparation method of BiOBr-NG nanocomposites was as follows: 0.12 g bismuth nitrate pentahydrate (Bi(NO 3 ) 3 ·5H 2 O) dissolved in deionized water, with nitric acid (HNO 3 ) solution to adjust its pH value to 3, in addition, disperse 0.8 mg NG in CTAB solution and mix it uniformly by ultrasonic. Then Bi(NO 3 ) 3 ·5H 2 The O solution was slowly dropped into the mixed solution of NG and CTAB. The above mixture was transferred to a round bottom flask and reacted in an oil bath at 60 °C for 3 h. After the reaction was completed, the prepared precipitate was repeatedly washed three times with ethanol and deionized water, and dried at 80°C for future use.
[0031] Among them, the volume of deionized water used as solvent was 50 mL, CTAB and Bi(NO 3 ) 3 ·5H 2 The molar ratio of O was 1:1, the ultrasonic mixing time was 0.5 h, and the concentration of CTAB was 8×10 -3 mol / L.
[0032] (2) Surface pretreatment of ITO electrode: Boil the ITO electrode with 1...
Embodiment 2
[0036](1) The preparation method of BiOBr-NG nanocomposites is as follows: 0.12 g Bi(NO 3 ) 3 ·5H 2 O dissolved in deionized water, with nitric acid (HNO 3 ) solution to adjust its pH value to 3. In addition, 1.56 mg was dispersed in CTAB solution and ultrasonically mixed. Then Bi(NO 3 ) 3 ·5H 2 The O solution was slowly dropped into the mixed solution of NG and CTAB. The above mixture was transferred to a round bottom flask and reacted in an oil bath at 80 °C for 3 h. After the reaction was completed, the prepared precipitate was repeatedly washed three times with ethanol and deionized water, and dried at 80°C for later use. figure 1 is the transmission electron microscope image of the synthesized BiOBr-NG nanocomposite, by figure 1 It can be seen that the flaky BiOBr is dispersed on the NG graphene sheet.
[0037] Among them, the volume of deionized water used as solvent was 50 mL, CTAB and Bi(NO 3 ) 3 ·5H 2 The molar ratio of O was 1:1, the ultrasonic mixing tim...
Embodiment 3
[0042] (1) The preparation method of BiOBr-NG nanocomposites is as follows: 0.12 g Bi(NO 3 ) 3 ·5H 2 O dissolved in deionized water, with nitric acid (HNO 3 ) solution to adjust its pH value to 3. In addition, 4.5 mg NG was dispersed in CTAB solution and ultrasonically mixed. Then Bi(NO 3 ) 3 ·5H 2 The O solution was slowly dropped into the mixed solution of NG and CTAB. The above mixture was transferred to a round bottom flask and reacted in an oil bath at 120 °C for 3 h. After the reaction was completed, the prepared precipitate was repeatedly washed three times with ethanol and deionized water, and dried at 80°C for future use.
[0043] Among them, the volume of deionized water used as solvent was 50 mL, CTAB and Bi(NO 3 ) 3 ·5H 2 The molar ratio of O was 1:1, NG, ultrasonic mixing time was 0.5 h, and the concentration of CTAB was (8×10 -3 mol / L).
[0044] (2) Surface pretreatment of ITO electrode: Boil the ITO electrode with 1 M sodium hydroxide for 15-20 minu...
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