Control over size, shape, and photonics of self-assembled organic nanocrystals

Chen Shahar, Yaron Tidhar, Yunmin Jung, Haim Weissman, Sidney R Cohen, Ronit Bitton, Iddo Pinkas, Gilad Haran, Boris Rybtchinski

Research output: Contribution to journalArticlepeer-review

Abstract

The facile fabrication of free-floating organic nanocrystals (ONCs) was achieved via the kinetically controlled self-assembly of
simple perylene diimide building blocks in aqueous medium. The ONCs have a thin rectangular shape, with an aspect ratio that is
controlled by the content of the organic cosolvent (THF). The nanocrystals were characterized in solution by cryogenic transmission electron microscopy (cryo-TEM) and small-angle X-ray scattering. The ONCs retain their structure upon drying, as was evidenced by TEM and atom force microscopy. Photophysical studies, including femtosecond transient absorption spectroscopy, revealed a distinct influence of the ONC morphology on their photonic properties (excitation energy transfer was observed only in the high-aspect ONCs). Convenient control over the structure and function of organic nanocrystals can enhance their utility in new
and developed technologies.
Original languageEnglish
Pages (from-to)42-51
Number of pages10
JournalBeilstein Journal of Organic Chemistry
Volume17
Issue number1
DOIs
StatePublished - 2021

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