The Application Of Carbon-based Nanocomposite Materials In Electrocatalysis And Biosensing

Carbon-based nano-materials have the size of dispersed phase at least one dimension within the 100 nm.They possess good electrical conductivity,large specific surface area,high temperature resistance,good corrosion resistance and biocompatibility and widely used in the fields of energy storage,heterogeneous catalysis,and medical sensing.In recent years,the reports of mesoporous carbon and graphene and their composites emerge in endlessly,which has caused great attention of researchers,especially in the field of electrochemical analysis.Here we successfully prepared the carbon-based ordered mesoporous carbon and graphene nocomposites and applied in the study of biological sensors and electrochemical catalytic fields.This paper mainly includes the following three aspects:1. The soft template is employed to one step synthesize iron nanoparticles loaded ordered mesoporous carbon nanocomposite?Fe-OMC? by organic-organic self-assembly method. Transmission electron microscopy?TEM?, scanning electron microscopy?SEM? and electrochemical measurements were employed for characterization of the materials. Cyclic voltammograms?CV? experiment showed that the composite modified electrode could effectively reduce the overpotential of nitrite, which indicated excellent catalytic performance of the nanocomposite. In addition, the apparent rate constant?k? of the modified electrode was 52.51 M^-1 s^-1?over one thousand times larger than bare electrode?.2. Cyclic voltammetry?CV? technology was emplpyed to one step direct electrodeposition of well dispersed electrochemical reduction graphene oxide?ERGO? assembled with nickel oxide nanocomposite inserted layer modified electrode?Ni₂O₃-NiO/ERGO GCE?. The modified electrode was characterized by SEM, Raman and X-ray photoelectron spectroscopy?XPS?. The results proved that the Ni₂O₃-Ni O/ERGO films modified electrode could be approximately described using the model of a thin layer diffusion mechanism. Additionally, 2, 4, 6-trinitrophenol?TNP? was chosen as the target molecules to study the electric catalytic performances of Ni₂O₃-NiO/ERGO GCE.3. An organic indicator1, 2-naphthoquinone-4-sulphonic acid sodium salt?NQS? functionalized graphene oxide nanocomposite?NQS/GO? taking advantage of the ?-? stacking between NQS and graphene oxide?GO? were successfully prepared. Based on this, a visual sensing platform for rapid and sensitive detection of sarcosine was proposed and explored. The limit of detection was 0.73 ?M. In addition, we further validated the sensing mechanism process of the NQS/GO on sarcosine via electrochemical methods.