▎ 摘　　要

Enriched metallic single-walled carbon nanotubes (mSWCNTs) were dispersed in aqueous solution of partially oxidized graphene (po-Gr). As-prepared po-Gr/mSWCNTs suspension was used to modify glassy carbon electrode (GCE) surface, which showed high electrocatalytic activity for dopamine (DA) oxidation in pH 7.0 phosphate buffered saline (PBS) solution. Using po-Gr/mSWCNTs/GCE we could detect DA from 350 to 3600 nM, with a detection limit down to 25 nM in physiological condition (in pH 7.0 PBS); whereas, po-Gr/GCE (without mSWCNTs) and bare GCE produced measurable signals only at or above 200 nM DA. Thus, the po-Gr/mSWCNTs film we fabricated is a promising nanomaterial for fabrication of biosensors for nanomolar detection of DA.