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Electrochemically controlled delivery of QDs into a living cell. a) Schematic describing the delivery and release principle of cargo through a membrane penetrating nanoneedle: applying a potential larger than the critical potential (~1.0 V) to the nanoneedle induces desorption of a SAM and thus release of QDs. b) Procedure for surface functionalization of a gold-coated nanoneedle and attachment of streptavidin-coated QDs.
