Fabrication of GO/PANi/CdSe nanocomposites for sensitive electrochemiluminescence biosensor

► The graphene oxide sheets/polyaniline/CdSe quantum dots (GO/PANi/CdSe) nanocomposites were successfully synthesized. ► The GO/PANi/CdSe nanocomposites have high ECL intensity and long-term stability. ► The constructed ECL biosensor exhibited high sensitivity and good selectivity to cytochrome C.