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Electronic circular dichroism imaging (CDi) maps local aggregation modes in thin films of chiral oligothiophenes

DOI: 10.1039/C9NJ02746G DOI Help

Authors: Gianluigi Albano (Università di Pisa) , Marcin Gorecki (Università di Pisa; Polish Academy of Sciences) , Gennaro Pescitelli (Università di Pisa) , Lorenzo Di Bari (Università di 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: New Journal Of Chemistry

State: Published (Approved)
Published: August 2019
Diamond Proposal Number(s): 14986

Abstract: We highlight the power of electronic circular dichroism imaging (CDi), a technique developed at Diamond Light Source B23 beamline for synchrotron radiation circular dichroism (SRCD) to detect local domains of chiral supramolecular order in thin films of chiral oligomers and polymers. The highly brilliant and collimated beamlight of B23 enabled CDi at a spatial resolution of 0.1 mm, unattainable with benchtop electronic circular dichroism (ECD) spectropolarimeters. CDi is bridging the gap between standard ECD spectroscopy and conventional microscopy. Presently, we apply CDi to reveal the local polymorphism of chiral oligothiophene-based molecules. By extensive use of a post-acquisition data-analysis tool called similarity factor, we quantified the polymorphs revealing a manifold of aggregation pathways whose relative weight was function of the sample preparation protocol. This work uncovers the parameters that need to be optimised in order to obtain reproducible and controllable supramolecular structures in thin films, which is of paramount importance for materials with optoelectronic properties. Noteworthy, this analysis is based on the CDi measurement at high spatial resolution of the thin film of organic chiral semiconductor at the ultimate stage of preparation as the active layer of an optoelectronic device.

Diamond Keywords: Semiconductors

Subject Areas: Technique Development, Chemistry, Physics

Instruments: B23-Circular Dichroism

Added On: 21/08/2019 14:02

Discipline Tags:

Surfaces Technique Development - Materials Science Physics Chemistry Materials Science interfaces and thin films Organic Chemistry

Technical Tags:

Spectroscopy Circular Dichroism (CD)