Authors:

Lukas Peng

Date Created:

Not specified

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About Paper:

In recent years, research has been done to further the understanding of organic conducting materials as an alternative to limited metal resources. Specifically, organic radicals have shown specific conductive, paramagnetic, and structural properties that make them potential candidates to supplement, or replace, other more established organic electronic materials. Moreover, liquid crystals (LC) are already well known as suitable materials for optoelectrical devices, such liquid crystal displays (LCD), due to their distinguished oriented domains. However, radical-containing liquid crystalline behavior has been infrequently reported and little is known about the behavior of these polymers. This work focuses on understanding the behavior of liquid crystallinity structures shown by a class of 2,2,6,6-tetramethyl-1-piperidinyloxyl (TEMPO) derivatives. Depending on the length of the carbon chain on the tail of TEMPO LCs, various crystalline phases and liquid crystalline (e.g., the nematic and smectic phases) were observed. The conductivity and magnetoresistance measurements (MR) of TEMPO LCs were further processed, performing up to conductivity value of ~ 30 S m-1 and ~ 100% MR, which are both state-of-art values reported from organic nonconjugated radicals to date. These data have provided critical insights to the structure-property relationships in this nascent class of materials, and these design rules will allow for the optimization of conductivity and magnetic field-dependent properties.

Source:

Purdue University / 2023

Topics:

No topics listed

Co-authors:

Lukas Peng