title: Infrared vibrational nanocrystallography and nanoimaging.
abstract: Molecular solids and polymers can form low-symmetry crystal structures that exhibit anisotropic electron and ion mobility in engineered devices or biological systems. The distribution of molecular orientation and disorder then controls the macroscopic material response, yet it is difficult to image with conventional techniques on the nanoscale. We demonstrated a new form of optical nanocrystallography that combines scattering-type scanning near-field optical microscopy with both optical antenna and tip-selective infrared vibrational spectroscopy. From the symmetry-selective probing of molecular bond orientation with nanometer spatial resolution, we determined crystalline phases and orientation in aggregates and films of the organic electronic material perylenetetracarboxylic dianhydride. Mapping disorder within and between individual nanoscale domains, the correlative hybrid imaging of nanoscale heterogeneity provides insight into defect formation and propagation during growth in functional molecular solids.
authors.affiliation: Department of Physics, Department of Chemistry, and JILA, University of Colorado, Boulder, CO 80309, USA.
authors.forename: Eric A
authors.identifier: 0000-0002-9629-1767
authors.initials: EA
authors.lastname: Muller
authors.affiliation: Department of Physics, Department of Chemistry, and JILA, University of Colorado, Boulder, CO 80309, USA.
authors.forename: Benjamin
authors.identifier: 0000-0002-5109-6415
authors.initials: B
authors.lastname: Pollard
authors.affiliation: Advanced Light Source Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
authors.forename: Hans A
authors.initials: HA
authors.lastname: Bechtel
authors.affiliation: Department of Physics, Department of Chemistry, and JILA, University of Colorado, Boulder, CO 80309, USA.
authors.forename: Peter
authors.identifier: 0000-0001-7772-5964
authors.initials: P
authors.lastname: van Blerkom
authors.affiliation: Department of Physics, Department of Chemistry, and JILA, University of Colorado, Boulder, CO 80309, USA.
authors.forename: Markus B
authors.initials: MB
authors.lastname: Raschke
mesh_terms: D003461:Crystallography; D007259:Infrared Rays; D013057:Spectrum Analysis / Q000379:methods*