Greatly extended storage stability of electrochemical DNA biosensors using ternary thiolated self-assembled monolayers

► Extended storage stability of electrochemical DNA biosensors. ► DNA biosensors based on a dithiol-based ternary alkanethiol monolayer. ► Sensors maintain their initial S/N ratio over a prolonged 3 months period at 4 °C. ► Prolonged stability which simplifies practical applications of DNA biosensors. ► Ability to design highly stable nucleic acid interfaces using common chemicals.