@article{12737,
  keywords = {Multidisciplinary},
  author = {Eric Muller and Thomas Gray and Zhou Zhou and Xinbin Cheng and Omar Khatib and Hans Bechtel and Markus Raschke},
  title = {Vibrational exciton nanoimaging of phases and domains in porphyrin nanocrystals},
  abstract = {Molecular coupling defines fundamental properties of materials, yet spectroscopic access and imaging have remained challenging due to the short length scales of order and disorder and the low energy scales of interactions. We employ vibrational excitons as local structural probes in nanoscale infrared imaging and spectroscopy to map molecular order in a model organic electronic material (octaethyl porphyrin ruthenium(II) carbonyl). We observe coexistence of both amorphous and crystalline phases. Even for highly crystalline porphyrin, the size of individual ordered regions can remain limited to a few molecular lengths. This approach of vibrational exciton nanospectroscopy is broadly applicable to many interacting molecular systems and can provide insight into structure and energy transfer in organic electronics, proteins, or other biological complexes.},
  year = {2020},
  journal = {Proceedings of the National Academy of Sciences},
  volume = {117},
  pages = {7030-7037},
  month = {2020-03},
  publisher = {Proceedings of the National Academy of Sciences},
  issn = {0027-8424, 1091-6490},
  doi = {10.1073/pnas.1914172117},
}