The Preparetion Of Graphene-Like Nanocomposite Interfaces And Application Of Their Electrochemical Field

Graphene-like composite materials possess high conductivity and conjugated structure, which has aroused widespread concern in biosensor and electrochemical catalysis areas. In this paper, through liquid-phase exfoliation and electrochemical polymerization methods, graphene-like-self-doped polyaniline (SPAN) and molybdenum disulfide-poly-aminobenzenesulfonic acid (MoS2-PABSA) nanocomposites were prepared, and among this process, graphene was used as the substrate. The prepared nanocomposite films achieved the detection of DNA immobilization and hybridization, and realized the catalytic detection of some biological molecules and drugs molecular. The specific works were as below:(1) Investigation on the effect of morphology and material composition on DNA sensitivity were directly reported based on the various graphene oxide (GNO) and SPAN nanocomposites. The isolation and dispersion of GNO via intercalated SPAN and ultrasonication were realized, where the ultrasonication prompts the aggregates of graphite oxide (GO) to break up and SPAN to diffuse into the stacked GO. Significant electrochemical enhancement has been observed in hybrids with the existence of SPAN. Compared with 2D GNO, SPAN and other morphologies of nanocomposites,3D GNO-SPAN nanowalls, which obtained from ultrasonication for 30 min with the mass ratio of 12, exhibited the highest surface density and hybridization efficiency. Furthermore, the fabricated biosensors presented the broad detection range and the low detection limit, which are mainly due to the specific surface area, a large number of electroactive species, and open accessible space supported by GNO-SPAN.(2) An easy, low-cost, and green liquild exfoliation method was applied in the preparation of the novel MoS2-SPAN nanocomposite. This nanocomposite owns large specific surface area, a large number of electroactive species, and open accessible space, accompanied with rich negative charged and special conjugated structure, which can be used to adsorpt positively charged and conjugated structure moleculers, due to the π-π* interaction and electrostatic adsorption, such as chloramphenicol, adenine and guanine, and bisphenol A. In the process of the electrocatalysis, SPAN-MoS2 interface exhibited the synergistic effect and good electrocatalytic activity.(3) The electropolymerization of m-aminobenzenesulfonic acid (m-ABSA) was realized on the surface of MoS2 by cyclic voltammetry method and MoS2-PABSA nanocomposite was obtained. The presence of MoS2 increased the surface area of glassy carbon electrode, and improved the polymerization ability of ABSA. Finally, the obtained MoS2-PABSA nanocomposite modified electrode has high surface area and abundant conjugate structure, so it can be used as an excellent analysis platform for detection of aromatic compounds. Here, takes 2,4,6-trinitrotoluene (TNT) as an example, due to the stacking interaction between composite materials and TNT molecular could enhance the adsorption capacity of TNT, so it realized the high sensitive detection of TNT.