Chemical sensing in two dimensional porous covalent organic nanosheets

Gobinda Das, Bishnu P. Biswal, Sharath Kandambeth, V. Venkatesh, Gagandeep Kaur, Matthew Addicoat, Thomas Heine, Sandeep Verma, Rahul Banerjee

Research output: Contribution to journalArticlepeer-review

469 Citations (Scopus)


Two new imide-based crystalline, porous, and chemically stable covalent organic frameworks (COFs) (TpBDH and TfpBDH) have been successfully synthesized employing solvothermal crystallization route. Furthermore, thin layered covalent organic nanosheets (CONs) were derived from these bulk COFs by the simple liquid phase exfoliation method. These 2D CONs showcase increased luminescence intensity compared to their bulk counterparts (COFs). Notably, TfpBDH-CONs showcase good selectivity and prominent, direct visual detection towards different nitroaromatic analytes over TpBDH-CONs. Quite interestingly, TfpBDH-CONs exhibit a superior "turn-on" detection capability for 2,4,6-trinitrophenol (TNP) in the solid state, but conversely, they also show a "turn-off" detection in the dispersion state. These findings describe a new approach towards developing an efficient, promising fluorescence chemosensor material for both visual and spectroscopic detection of nitroaromatic compounds with very low [10-5 (M)] analyte concentrations.

Original languageEnglish
Pages (from-to)3931-3939
Number of pages9
JournalChemical Science
Issue number7
Publication statusPublished - 2015 Jul 1

Bibliographical note

Publisher Copyright:
© The Royal Society of Chemistry 2015.

All Science Journal Classification (ASJC) codes

  • Chemistry(all)


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