We present the first example of covalent chemistry on fluorographene, enabling the attachment of -SH groups through nucleophilic substitution of fluorine in a polar solvent. The resulting thiographene-like, 2D derivative is hydrophilic with semiconducting properties and bandgap between 1 and 2 eV depending on F/SH ratio. Thiofluorographene is applied in DNA biosensing by electrochemical impedance spectroscopy.

Regional Centre of Advanced Technologies and Materials Department of Physical Chemistry Faculty of Science Palacky University Slechtitelu 11 783 71 Olomouc Czech Republic

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