Copper nanoparticle/pyrocatechol violet/carbon nanotube-modified electrode and application thereof

[0029] Such as figure 1 , the preparation process of GCE / SWCNTs, GCE / SWCNTs / PCV and GCE / SWCNTs / PVC / CuNPs modified electrodes of the present invention is as follows:

[0030] The first step is the pretreatment of the glassy carbon electrode (GCE).

[0031] First use deionized water to ultrasonically clean, then carefully polish the electrode on the treated suede with aluminum oxide particles, and then use ethanol and deionized water to clean it ultrasonically, and finally dry it in the air before use.

[0032] The second step is the preparation of GCE / SWCNTs modified electrodes.

[0033] SWCNTs need to be soaked with dimethylformamide (DMF) first, and then ultrasonicated to disperse the solution. The SWCNTs / DMF suspension was dripped on the surface of the electrode and dried in the air to obtain the GCE / SWCNTs modified electrode.

[0034] The third step is the preparation of GCE / SWCNTs / PCV modified electrodes.

[0035] The modified electrode was placed in

[0039] Such as figure 2 , AFM characterization diagrams of GCE / SWCNTs, GCE / SWCNTs / PCV and GCE / SWCNTs / PCV / CuNPs modified electrodes of the present invention.

[0040] Such as figure 2 A It can be seen that GCE / SWCNTs exhibit the characteristics of single-walled carbon nanotubes with entangled tube structure. Such as figure 2 As shown in B, after PCV electrodeposition, SWNTs are well dispersed and incorporated into the PCV film, and then an interconnected network structure of SWNTs is formed on the electrode. This conductive SWCNT network builds up throughout the sensing system responsible for the electrical and electrochemical conduction pathways. figure 2 C shows the morphology of GCE / SWCNTs / PVC / CuNPs, in which many particles are uniformly attached to the surface of PCV-containing SWNT-modified electrode. The average size of the particles is about 5~7nm. The uniform distribution of small-sized particles will have many good properties, such as large sp

[0042] Application of GCE / SWCNTs / PCV / CuNPs modified electrodes

[0043] Using cyclic voltammetry to study N 2 Electrochemical activity of GCE / SWCNTs / PCV / CuNPs in saturated PBS (0.1 M, pH = 7.4) solution versus H 2 o 2 The reduction situation, the voltage range is 0.2~-0.5 V, and the scan rate is 10mV s -1 . Such as image 3(A) GCE / SWCNTs, (B) GCE / SWCNTs / PCV, (C) GCE / SWCNTs / PCV-Cu are shown 2+ and (D) GCE / SWCNTs / PCV / CuNPs in the presence (curve b) without (curve a) 1.0 mM H 2 o 2 The cyclic voltammetry curve. The cyclic voltammetry curves of GCE / SWCNTs showed a pair of stable redox peaks (anode potential of -0.107V and cathode potential of -0.110V) ( image 3 curve in A), which is related to the redox of carboxylic acids. In the report of our previous research work, N 2 The cyclic voltammetry curves of GCE / SWCNTs / PCV in saturated PBS (0.1M, pH =7.4) showed two distinct peaks ( image 3 curve in B). After adding Cu 2+ After that, the p