Electro-deposition gold nanoparticles, preparation method and application thereof
A nanoparticle and electrodeposition technology, applied in the direction of material electrochemical variables, etc., can solve the problems of time-consuming preparation process and poor stability of biosensors, and achieve the effect of speeding up the rate.
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[0018] Example 1: Electrochemical method to deposit gold nanoparticles.
[0019] The self-made glassy carbon electrode (GCE) first uses 1.0, 0.3, and 0.05 μm Al 2 O 3 The powder is polished, sonicated with water and absolute ethanol for 5 minutes each, and dried with nitrogen. Immerse the electrode in 6 mL 0.5% HAuCl 4 In solution (containing 0.5 M H 2 SO 4 , Used N 2 Saturated for 15 minutes) Let it stand, and then use chronoamperometry to sweep at +1.1 V and 0 V for 60 s and 30 s respectively, and wash with distilled water after completion. Observe that a dark red solid appears on the surface of the glassy carbon electrode. Nano gold. Put this electrode in 0.5 M H 2 SO 4 Voltammetry is used in the middle, and the potential is -0.2 ~ 1.6 V until the peak current is basically unchanged (about 20 cycles) to remove the impurities adsorbed on the surface.
[0020] The morphology of electrodeposited gold nanoparticles is as follows figure 1 As shown, the average particle size of the ...
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[0023] Example 2: The GCE electrode was modified based on electrodeposited gold nanoparticles and magnetic ferroferric oxide nanoparticles.
[0024] Take 20 μL of 1 mg / mL nano-ferroferric oxide solution with a particle size of about 10 nm on the flat glass, and magnetically adsorb FNPs on the surface of the electrode with a magnetic glassy carbon electrode deposited with nano-gold. GNPs play the role of nanowires in this system and are closer to the redox center of FNPs. Speed up the rate of electron transfer. From image 3 It can be seen that the peak current is proportional to the sweep speed, indicating that the electron transfer process is controlled by surface adsorption. And according to the Laviron equation, the electron transfer constant is 0.1s -1 .
[0025] We use cyclic voltammetry to investigate the electrochemical behavior of FNPs on the surface of electrodeposited gold, such as Figure 4 As shown, by comparison, it can be seen that FNPs have no obvious redox peak...
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