Ultrasensitive and selective electrochemical sensor for nanomolar dopamine determination based on MnS/Co3S4 hybrids embedded on electrochemically reduced graphene oxide

Preparation of MnS/Co3S4 ErGO/GCE and schematic diagram of its electrochemical response to DA. This protocol used a two-step ion exchange method to prepare MnS/Co3S4 heterostructures, with self-made cobalt chloride bicarbonate (CO (CO3) 0.35C0.20 (OH) 1.10) as the precursor, sodium disulfide monohydrate as the sulfur source, and manganese chloride as the manganese source. The obtained MnS/Co3S4-ErGO was modified on a glassy carbon electrode, exhibiting electrochemically ultrasensitive ability for the redox reaction of DA determination at nanomolar concentration.