Resistive switching in an organic supramolecular semiconducting ferroelectric

Abstract

The combination of switchable dipolar side groups and the semiconducting core leads to a material showing continuous tunability from injection- to bulk-limited conductivity modulation.

Unveiling Polymerization Mechanism in pH‐regulated Supramolecular Fibers in Aqueous Media

“…This ratifies the formation of helical columnar aggregates with a preferred handedness at elevated pH when the monomers are in their non‐protonated state.). These results are in good agreement with the data previously reported by us showing the characteristic features of BTT derivatives either molecularly dissolved or aggregated in fibrillar structures by UV and CD spectroscopy [12,13] …”

“…These results are in good agreement with the data previously reported by us showing the characteristic features of BTT derivatives either molecularly dissolved or aggregated in fibrillar structures by UV and CD spectroscopy. [ 12 , 13 ]…”

“…These results are in good agreement with the data previously reported by us showing the characteristic features of BTT derivatives either molecularly dissolved or aggregated in fibrillar structures by UV and CD spectroscopy. [12,13] Moreover, the normalized CD (Figures. 1d and S1) and UV (Figure S2) signals during the pH-dependent experiments are in perfect agreement with the protonation states and pKa values of the terminal amine groups [14] and can be nicely fitted by the Hendersen-Hasselbalch equation.…”

Chiral Self-Sorting and the Realization of Ferroelectricity in the Columnar Liquid Crystal Phase of an Optically Inactive N,N′-Diphenylurea Derivative Possessing Six (±)-Citronellyl Groups

“…Recently, axially polar ferroelectric columnar liquid crystal (AP-FCLC) phases (Figure ), in which the polarity along the column axis is induced by applying an electric field and is maintained after removal of the electric field, have been increasingly studied. − In the columnar liquid crystal (LC) phase, the polar directions of the molecules (Figure a) are fixed to generate a polar column (Figure b) by intermolecular steric interactions − or intermolecular hydrogen bonding between the groups such as amide, ,− urea, − triazole, and vinylidene fluoride oligomer (VDFO) groups. The polar columns that are self-organized into a nonpolar state (Figure c) are polarized by applying an electric field, and the induced columnar polarities are switched (Figure d,e) by changing the directions of the applied electric field.…”

Dual-Mode Chiral Self-Assembly of Cone-Shaped Subphthalocyanine Aromatics

“…Now, when the molecular structure deviates from planarity, as in cone-shaped moleculesalso named conic, bowlic, or pyramidicadditional intriguing properties may arise as a consequence of their stacking. First, a molecule with a conic shape or cone conformations may present axial dipoles that can interact with electric fields and, if piled up in columns and aligned uniaxially, give rise to polarly ordered materials exhibiting switchable (i.e., ferroelectric) , or permanent , polarization, as well as anisotropic charge transport. , As a matter of fact, conic molecules are contributing strongly to the renovated interest in the field of supramolecular ferroelectrics and polar assemblies, where novel materials with unprecedented physical properties are being developed from molecular design . A second important difference with respect to planar discotics is that, when properly substituted, a pyramidal molecule may become chiral and will thus have the possibility of forming homochiral helical assemblies. , As opposed to the many examples of helically stacked discotics where chiral centers are placed in the disordered peripheral chains, chirality resides here intrinsically in the aromatic core of the molecule.…”