Furan ring-functionalized solid surfaces are achieved by the initiated chemical vapor deposition (iCVD) method, a solvent-free process to form films under mild conditions. The polymerization of furfuryl methacrylate monomer is initiated by a resistively heated filament wire. The functionality of the furan group in the iCVD film enabled Diels-Alder chemistry with 4-phenyl-1,2,3-triazolin-3,5-dione (N-PTD).