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May 1, 20261 citations

Doping as a Strategy for Modulating Crystallinity and Optical Properties of Large Area Films of Semiconducting 2D-COFs.

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DSDiksha SrivastavaJDJyotirban DeySRSoumyajit Rajak

Key Points

  • This study aims to explore how doping affects the crystallinity and optical properties of 2D covalent organic frameworks (COFs).
  • Doping of 2D-COFs with materials like melamine, PDA, and TCA was analyzed.
  • Optical and structural characteristics were evaluated using spectroscopic and microscopic techniques.
  • Density functional theory calculations were employed to characterize electronic modifications.
  • The optical band gap increased from ≈2.2 eV to ≈2.6 eV with optimal melamine doping.
  • Large, highly crystalline domains were observed in the films with the optimal doping ratio of melamine to PDA and TCA.
  • Significant structural and electronic modifications were recorded, indicating effective doping.

Abstract

-phenylenediamine (PDA), benzene-1,3,5-tricarboxaldehyde (TCA), and melamine (Me) dopant, leading to significant alterations in both crystallinity and optical properties. Notably, the optical band gap shows a strong blue shift from ≈2.2 eV for the undoped 2D-COF to ≈2.6 eV for the optimally Me-doped 2D-COF. In addition, for the optimum ratio of melamine to PDA and TCA, we observed large, highly crystalline domains within the film. The effect of melamine doping on the structural and electronic modifications of the films was characterized using various spectroscopic and microscopic techniques and density functional theory calculations.

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Cite This Study

Srivastava et al. (2026) studied this question.

synapsesocial.com/papers/69f4427a967e944ac556608bhttps://doi.org/10.1021/acsami.6c01858
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