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Circular dichroism imaging: mapping the local supramolecular order in thin films of chiral functional polymers

DOI: 10.1021/acs.macromol.6b02590 DOI Help

Authors: Francesco Zinna (University of Pisa) , Claudio Resta (University of Pisa) , Marcin Gorecki (University of Pisa) , Gennaro Pescitelli (University of Pisa) , Lorenzo Di Bari (University of Pisa) , Tamas Javorfi (Diamond Light Source) , Rohanah Hussain (Diamond Light Source) , Giuliano Siligardi (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Macromolecules

State: Published (Approved)
Published: February 2017
Diamond Proposal Number(s): 14446

Abstract: We introduce the concept of circular dichroism (CD) imaging CDi, which is made possible by the use of the highly collimated light beam, typical of synchrotron radiation (SR) and of the equipment available at Diamond Light Source for surface scanning of solid samples. At the moment, the space resolution is about 1 mm2, but there are prospects to increase it to at least 0.1 mm2 in the near future. We apply SR-CDi to thin films of conjugated polymers, which give rise to large chiral aggregates. Electronic CD is able to reveal and characterize these supramolecular structures; thus, SR-CDi provides the ultimate complement to microscopy for investigating local domains with different molecular order and to fill a gap between a purely morphological knowledge and an intimate insight into the molecular level. As a corollary of this proof-of-concept work, we showed that such a new technique may provide rational and successful protocols to obtain homogeneous active layers for the fabrication of optoelectronic devices.

Journal Keywords: Polymer films; Thin films; Circular dichroism spectroscopy; Aggregation; Polymers

Subject Areas: Technique Development, Materials, Chemistry


Instruments: B23-Circular Dichroism

Added On: 27/02/2017 09:33

Discipline Tags:

Surfaces Technique Development - Materials Science Physics Physical Chemistry Electronics Chemistry Materials Science interfaces and thin films Polymer Science

Technical Tags:

Spectroscopy Circular Dichroism (CD)