Surface‐enhanced Raman scattering of carbazole‐based covalent triazine framework

Author:

Kong Fan1ORCID,Zhang Shuting1,Ding Shounian1

Affiliation:

1. School of Chemistry and Chemical Engineering Southeast University Nanjing China

Abstract

AbstractA kind of carbazole‐based covalent triazine framework (CTF‐Cz) has been synthesized from a carbazole derivative. The porous polymer can efficiently adsorb probe molecules due to the strong intermolecular interactions caused by the polar triazine moiety. CTF‐Cz directly serves as the surface‐enhanced Raman scattering substrate without any post proceeding techniques. The enhancement factor of CTF‐Cz is ~105 for detecting rhodamine 6G (R6G). The lowest unoccupied molecular orbital energy level of CTF‐Cz (−3.93 eV) is much lower than that of R6G, which is in favor of the charge transfer from R6G to CTF‐Cz for illumination under a 532 nm laser, which is proved by time resolved photoluminescence spectra. The efficient charge transfer induced by the strong intermolecular π–π interactions and large molecular‐orbital delocalization contribute to the enhanced Raman signals of R6G on CTF‐Cz.

Funder

National Natural Science Foundation of China

Publisher

Wiley

Subject

Materials Chemistry,Polymers and Plastics,Surfaces, Coatings and Films,General Chemistry

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