Crystal polarity enhanced by interactions between antiparallel crystal dipoles

Lin, Kun‐Ta; Huang, Sheng-Hao; Li, Wei-Ting; Lin, Hsin-Hui; Su, Chun‐Jen; Jeng, U‐Ser; Ko, Meng-Chen; Ruan, Jrjeng

doi:10.1016/j.apsusc.2023.157243

Cited by 2 publications

(1 citation statement)

References 54 publications

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“…A phenol novolac-based epoxy, EPO-TEK 353ND, was purchased from Epoxy Technology to peel the top disordered P3HT. For inner-layer morphology, the films were peeled through the deposited carbon films instead of novolac epoxy, and the peeled layers at different depths were individually imaged by the transmission electron microscope, 68 JEOL JEM-1400 instrument operated at 120 kV. Their bright-field images were recorded via a Gatan digital camera.…”

Section: Imaging Morphologymentioning

confidence: 99%

Forming Long-Range Order of Semiconducting Polymers through Liquid-Phase Directional Molecular Assemblies

Pham,

Su,

Huang

et al. 2024

Macromolecules

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Intermolecular interactions are crucial in determining the morphology of solution-processed semiconducting polymer thin films. However, these random interactions often lead to disordered or short-range ordered structures. Achieving long-range order in these films has been a challenge due to limited control over microscopic interactions in current techniques. Here, we present a molecular-level methodology that leverages spatial matching of intermolecular dynamics among solutes, solvents, and substrates to induce a directional molecular assembly in weakly bonded polymers. Within the optimized dynamic scale of 2.5 Å between polymer side chains and self-assembled monolayers (SAMs) on nanogrooved substrates, our approach transforms random aggregates into unidirectional fibers with a remarkable increase in the anisotropic stacking ratio from 1 to 11. The Flory−Huggins-based molecular stacking model accurately predicts the transitioning order on various SAMs, validated by morphological and spectroscopic observations. The enhanced structural ordering spans over 3 orders of magnitude in length, rising from the smallest 7.3 nm random crystallites to >14 μm unidirectional fibers on submillimeter areas. Overall, this study provides insights into the control of complex intermolecular interactions and offers enhanced molecular-level controllability in solution-based processes.

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Section: Imaging Morphologymentioning

confidence: 99%

Forming Long-Range Order of Semiconducting Polymers through Liquid-Phase Directional Molecular Assemblies

Pham,

Su,

Huang

et al. 2024

Macromolecules

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Photocatalytic Hydrogen Evolution Enabled by Oriented Phase Interactions between Monolayers of P3HT‐Wrapped MoS₂ and Ferroelectric Lamellar Crystals

Lin,

Cheng,

Cheng

et al. 2023

Adv Funct Materials

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Unveiled as a unique feature of polymer ferroelectric crystals, oriented coalescence within monolayers of poly(vinylidenefluoride‐co‐trifluoroethylene)(PVDF‐TrFE) ferroelectric crystals has been found regulable upon monolayer roughness, which is accompanied by the adjustment of piezoelectric responses, and thus phase polarity. Simply with the deposition of poly(3‐hexylthiophene (P3HT)‐wrapped molybdenum disulfide (MoS2) sheets, piezoelectric responses of polymer ferroelectric crystals are surprisingly enhanced further. Also dependent on the degrees of phase polarity, the binding energy of P3HT excitons declines to a level comparable to that of inorganic excitons, together with the alteration of work functions. These results suggest mutual polarization between ferroelectric lamellar crystals and originally nonpolar P3HT‐wrapped MoS2 sheets as a result of dipole‐induced dipole phase interactions. As the Fermi levels and driving forces of interfacial electron transition are also adjustable upon involved phase interactions, P3HT‐wrapped MoS2 sheets can photocatalyze hydrogen evolution with an average production rate reaching 4.474 mmol g−1 h−1, which is 1.6 times higher than the results without the aid of phase interactions. Accordingly, amplifying phase interactions has been elucidated feasible, and able to serve as a promising approach to generally promote photocatalytic reactions.

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Crystal polarity enhanced by interactions between antiparallel crystal dipoles

Cited by 2 publications

References 54 publications

Forming Long-Range Order of Semiconducting Polymers through Liquid-Phase Directional Molecular Assemblies

Forming Long-Range Order of Semiconducting Polymers through Liquid-Phase Directional Molecular Assemblies

Photocatalytic Hydrogen Evolution Enabled by Oriented Phase Interactions between Monolayers of P3HT‐Wrapped MoS₂ and Ferroelectric Lamellar Crystals

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Crystal polarity enhanced by interactions between antiparallel crystal dipoles

Cited by 2 publications

References 54 publications

Forming Long-Range Order of Semiconducting Polymers through Liquid-Phase Directional Molecular Assemblies

Forming Long-Range Order of Semiconducting Polymers through Liquid-Phase Directional Molecular Assemblies

Photocatalytic Hydrogen Evolution Enabled by Oriented Phase Interactions between Monolayers of P3HT‐Wrapped MoS2 and Ferroelectric Lamellar Crystals

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Photocatalytic Hydrogen Evolution Enabled by Oriented Phase Interactions between Monolayers of P3HT‐Wrapped MoS₂ and Ferroelectric Lamellar Crystals