A novel sensitive electrochemical sensor for lead ion based on three-dimensional graphene/sodium dodecyl benzene sulfonate hemimicelle nanocomposites

•An electrochemical sensor based on 3D graphene/SDBS hemimicelle nanocomposite was constructed.•Wide linear ranges and low detection limits for lead ion are obtained.•The nanocomposite exhibits outstanding electronic and specific area properties due to 3D graphene.•The nanocomposite can accumulate metal ions due to SDBS hemimicelles.