Photo by vlisidis from unsplash
ABSTRACT We compared the changes in optical transmission spectrum induced by self-assembly on CVD graphene of (i) a model squarylium dye, namely n-butyl-squarylium dye (1,3-Bis[4-(dibutylamino)phenyl]-2,4-squaraine) and (ii) a conjugated polymer,… Click to show full abstract
ABSTRACT We compared the changes in optical transmission spectrum induced by self-assembly on CVD graphene of (i) a model squarylium dye, namely n-butyl-squarylium dye (1,3-Bis[4-(dibutylamino)phenyl]-2,4-squaraine) and (ii) a conjugated polymer, poly(3-hexyl thiophene). We analyse the results based on Scanning Tunnelling Microscope images. The self-assembly of the zwitterionic dye is controlled by electrostatic interactions. A strong red-shift is observed and is explained in terms of electrostatic interactions with graphene. The self-assembly of polyalkylthiophenes presents a large red shift due to a strong alignment and planarization of the conjugated π-electron system and the formation of a new molecule-graphene charge-transfer exciton state.
Journal Title: Molecular Crystals and Liquid Crystals
Year Published: 2017
Link to full text (if available)
Share on Social Media: Sign Up to like & get
recommendations!