One-Step Electrochemical Synthesis Of Graphene-Conducting Polymer Composite Material

Because of unique electrochemical properties and good biocompatibility, composite materials of graphene and conducting polymers have attracted wide attention recently. Hence, a lot of methods to fabricate composite materials have been adopted. Among them, electrochemical synthesis process attracts growing attention due to its controlling process, easy operating, and green. Some methods with wide voltage can synthesis nanohybrids of graphene and conducting polymers in one-step.In this paper, two composite nanomaterials of PXa-ERGNO were fabricated on the GNO-modified electrodes. A series of investigations were carried out based on these modified electrodes. The work can be summarized as follows:(1) PXa-ERGNO nanomateral has been synthesized successfully through the CV electropolymerization method. The morphology and electrochemical properties of the prepared composite were characterized by using scanning electron microscopy, cyclic voltammetry, EIS and so on. The π-π interactions between the conjugated GNO layers and aromatic ring of Xa enhanced the electropolymerization efficiency accompanied with an increased electrochemical response of PXa. The rich carboxyl groups of PXa-ERGNO film were applied to stably immobilize the probe DNA via covalent bonding. The captured probe could sensitively and selectively recognize its target DNA via EIS. The dynamic detection range was from1.0×10-14mol/L to1.0×10-8mol/L with a detection limit of4.2×10-15mol/L. (2) A nanohybrid of PXa-ERGNO was electropolymerized by pulse constant-potential method in one-step. The re-prepared GNO precursor could be electrochemically reduced to reduced graphene oxide at cathodic potentials, meanwhile, Xa monomer can be polymerized at anodic potentials. And the morphology and electrochemical properties of the prepared film were studied by scanning electron microscopy, cyclic voltammetry, and differential pulse voltammetry. The optimization of condition was based on the electrochemical siganal of guanine and adenine bases. The prepared PXa-ERGNO modified electrode was used as an electrochemcal platform to detect guanine and adenine with high sensitivity. The detection limit for individual determination of guanine and adenine was4.0×10-7mol/L and6.0×10-7mol/L, respectively.