Gold nanoparticle/reduced graphene oxide composite electrode, and preparation and application thereof

Abstract

The invention discloses a gold nanoparticle / reduced graphene oxide composite electrode and a preparation method thereof, belonging to the cross fields of electrochemical analysis and chromatography technology. The preparation method comprises the following steps: mixing flake graphite with sodium nitrate with concentrated sulfuric acid and potassium permanganate as oxidizing agents so as to prepare graphene oxide; mixing ultrasonically-dispersed graphene oxide with a chloroauric acid solution under stirring, and then carrying out reduction with sodium citrate and a hydrazine hydrate solution so as to obtain a gold nanoparticle / reduced graphene oxide composite material; and inserting one enamelled wire with two polished ends from one end of a hollow insulating tube, contacting the enamelledwire with a mixture, packed into the hollow insulating tube from the other end, of the composite material and liquid paraffin, and carrying out immobilization so as to prepare the composite electrode. The preparation method for the composite electrode is simple. The prepared composite electrode can detect aromatic biogenic amines and precursor amino acids thereof through combined usage with electrochemical detection technology, and has the characteristics of high sensitivity and low analysis cost. Compared with surface-modified electrodes, the composite electrode has more stable analysis performance when cooperatively used with separation systems like electrophoresis, liquid chromatography and flow injection systems.

Description

technical field [0001] The invention belongs to the intersection field of electroanalytical chemistry and chromatographic technology, and specifically relates to the preparation and application of a gold nanoparticle / reduced graphene oxide composite electrode. Background technique [0002] Graphene is a two-dimensional carbon nanomaterial with large specific surface area, good electrical and thermal conductivity, and strong mechanical strength. Since 2004 Giem et al. [1] After its discovery, graphene attracted a lot of attention from the scientific community. Its preparation methods include mechanical exfoliation, chemical vapor deposition, and chemical reduction or thermal reduction of graphene oxide. [2] Among them, the reduction graphene oxide method is economical and widely used. Graphene's excellent electrical conductivity and electrocatalytic activity enable it to be used as an electrode material in the fields of electrochemical sensing and biosensing. There are tw...

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Problems solved by technology

[0004] Gold nanoparticles / reduced graphene oxide composites have been used as modified electrode materials in the field of electrochemical analysis. However, when subjected to continuous scouring by fluid solutions, the modified materials are easy to fall off, which affects the life and reproducibility of the electrodes.

The composite material is prepared into a gold nanoparticle / reduced graphene oxide composite electrode, which helps to improve the stability of the electrode. At present, its application in the chromatographic analysis system has not been reported.

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