Graphene and Mxene layers for sensing applications (Conference Presentation)

Functionalized layers of conductive 2D-materials such as graphene or Mxenes are attractive for multiple environmental, catalytic and bioanalytical applications. For example, functionalized graphene is used for sensing applications in field‐effect transistor (GFETs) or in optofluidic cells. Combined IR and Raman spectroscopies enable sensitive analysis of the 2-D material properties and allow to identify the covalent or non-covalent functionalizations. Both spectroscopies have a high potential for in situ and operando applications for sensitive interface characterization as well as in the label-free analysis of nL to µL liquid volumes. We investigated specific graphene regions that were electrochemically modified by ultrathin, few nanometer thick films of 4-aminophenylacetic acid (4-APhAA) or maleimidophenyl (MP) as well as aminophenyl modified MXene (Ti3C2Tx) surfaces. IR ellipsometry was used to prove the binding of (4-nitrobenzyl)mercaptan (NBM) molecules to MP functionalized graphene surface. We acknowledge financial support by the European Union through EFRE 1.8/13.