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DS: Fachverband Dünne Schichten
DS 15: Organic Thin Films, Organic-Inorganic Interfaces
DS 15.3: Vortrag
Freitag, 21. März 2025, 10:15–10:30, H3
highly crystalline, cleavable, and transferable semi-conducting 2D imine COF film — •diksha srivastava1, vipin mishra2, showkat h. mir3, jyotirban dey1, jayant k. singh1, manabendra chandra1, and thiruvancheril g. gopakumar1 — 1Indian Institute of Technology Kanpur, Kanpur 208016, India — 2KU Leuven, Celestijnenlaan 200F, Leuven B-3001, Belgium — 3University of Kashmir, Hazratbal, Srinagar 190006, Jammu and Kashmir, India
Two-dimensional (2D) imine-based covalent organic frameworks (COFs) are emerging crystalline organic polymers with potential applications in thin-film electronics, sensing, and catalysis, driven by their stability, tunable electronic properties, and versatile functionality. We present a scalable method for synthesizing 2D imine-COF films on dielectric glass substrates via a Schiff base reaction between p-phenylenediamine (PDA) and benzene-1,3,5-tricarboxaldehyde (TCA) over 15 hours. This yields highly crystalline 2D networks with film thicknesses ranging from 100 nm to a few monolayers and lateral dimensions up to 2 cm. Sonication exfoliation is employed for producing free-standing films. Structural characterization via SEM, TEM, and AFM confirms highly crystalline 2D structures. XPS analysis validates the chemical composition, while optical measurements indicate a semi-conducting band gap. DFT calculations show a semiconductor-like band structure with strong band dispersion near the conduction and valence band edges, signifying efficient charge transport and potential for future electronic applications.
Keywords: 2D covalent organic frameworks; sonication exfoliation; ultrathin films; semiconductor; organic electronics