Enzyme-free glucose electrochemical sensor and detection method thereof
An electrochemical and glucose technology, applied in the field of electrochemical sensors and their detection, can solve problems affecting accuracy and sensitivity, achieve high sensitivity, eliminate air bubbles, and stabilize detection signals
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Embodiment 1
[0029] 2.912g Co(NO 3 ) 2 ·6H 2 O and 3.284 g of 2-methylimidazole were dissolved in 160 mL of methanol solution, respectively, and then the 2-methylimidazole solution was slowly added to the methanol solution of cobalt nitrate, and stirred for 24 hours. After centrifugation, it was washed with methanol, repeated three times, and then dried in a constant temperature drying oven at 70 °C to obtain ZIF-67. Dissolve 100 mg of palladium acetate in 10 mL of acetone, then add 100 mg of ZIF-67 to the palladium acetate solution, stir for 1 hour at 56°C in an oil bath, slowly add 1 mL of formic acid and stir, wash with acetone after centrifugation, repeat 3 Then, it was dried in a constant temperature drying oven at 70 °C to obtain Pd@ZIF-67. 10mgPd@ZIF-67 was ultrasonically dispersed in 200μL of ethanol, and 3μL of dispersed droplets were applied with a pipette on the surface of a glassy carbon electrode with a cross-sectional diameter of 2mm, and the working electrode was naturall...
Embodiment 2
[0032] 2.007g Cr (NO 3 ) 3 9H 2 O, 5 mM 48 wt% HF, 5 mM p-98% phthalic acid were mixed with 24 mL of deionized water and heated at 220°C for 8 hours. After cooling to room temperature, it was filtered, washed with deionized water and ethanol, the obtained solid was soaked in ethanol at 80°C for 24 hours, and dried at 150°C under vacuum to obtain MIL-101. 200mg / L H 2 PtCl 6 Mixed with PVA at a molar ratio of 10:1, stirred in an ice-water bath for 1 hour, and then added 0.01M NaHB 4 , NaHBH 4 The molar ratio to metal was 5:1, stirring, at this time, MIL-101 was rapidly added, stirred at 0 °C for 4 hours, rinsed with deionized water, and vacuum-dried at 100 °C to obtain Pt@MIL-101. Add 2 mg of MIL to -101@Pt was ultrasonically dispersed in 200 μL of ethanol, and 3 μL of dispersed droplets were removed with a pipette and applied to the surface of a glassy carbon electrode with a cross-sectional diameter of 2 mm. The wire is the counter electrode to form a three-electrode s...
Embodiment 3
[0035] 0.0608g Zn(NO 3 ) 2 , 0.0255g H 2BDC and 16mL DMF were placed in a 20mL Teflon container and stirred and mixed until clear. After heating at 100 °C for 5 hours, N 2 Under cooling conditions, square crystals were obtained by cooling with 15 mL DMF and 15 mL ℃ H 2 Cl 2 The crystals were washed and dried at 100°C for 12 hours to obtain MOF-5. in N 2 Conditions Add 100mg MOF-5 to 1mLH 2 PtCl 6 , where Pt is 1 wt%, ultrasonically dispersed for 5 minutes at room temperature, and then dried at 60 °C for 3 hours. The obtained solid was placed in a stainless steel reactor at 220 °C under the condition of 50 mL / min of H 2 Pt@MOF-5 was obtained by reacting for 2 hours in a flowing environment. 2 mgPt@MOF-5 was ultrasonically dispersed in 200 μL DMF, and 3 μL dispersed droplets were applied to the surface of the glassy carbon electrode with a cross-sectional diameter of 2 mm with a pipette, and the working electrode was obtained by natural drying. Ag / AgCl was used as the r...
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