Chemical sensing in two dimensional porous covalent organic nanosheets

TitleChemical sensing in two dimensional porous covalent organic nanosheets
Publication TypeJournal Article
Year of Publication2015
AuthorsDas, G, Biswal, BP, Kandambeth, S, Venkatesh, V, Kaur, G, Addicoat, MA, Heine, T, Verma, S, Banerjee, R
JournalChemical Science
Volume6
Issue7
Pagination3931-3939
Date PublishedAPR
ISSN2041-6520
Abstract

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.

DOI10.1039/c5sc00512d
Type of Journal (Indian or Foreign)

Foreign

Impact Factor (IF)

9.144

Divison category: 
Physical and Materials Chemistry