Graphene and CdS nanocomposite: A facile interface for construction of DNA-based electrochemical biosensor and its application to the determination of phenformin

- Graphene/CdS nanocomposite was synthesized with a low temperature process.
- GR-CdS possessed outstanding electrochemical performance for electron transfer.
- Electrochemical response of DNA on electrode was significantly promoted by GR-CdS.
- DNA/GR-CdS biosensor showed sensitive electrochemical response to phenformin.