1 research outputs found
Understanding the Interplay between Molecule Orientation and Graphene Using Polarized Raman Spectroscopy
We present a systematic
study in investigating the orientation
characteristics of pentacene molecules grown on graphene substrates
using polarized Raman spectroscopy. The substrate-induced orientation
alignment of pentacene can be well distinguished through the polarized
Raman spectra. Interestingly, we found that the nature of polycrystalline
graphene not only provides efficient route to control molecular orientation,
but also acts as an excellent template allowing conjugated molecules
to stack accordingly. The relative orientation of the well-aligned
pentacene molecules and the nearby graphene domains exhibits several
preferred angles due to atomic interactions. This unique feature is
further examined and verified by single domain graphene. Furthermore,
polarized Raman spectroscopy contains abundant information allowing
us to analyze the ordering level of pentacene films with various thicknesses,
which provides insightful perspectives of manipulating molecular orientations
with graphene and spatial organization between conjugated systems,
in a more quantitative manner