Detection of nitroaromatic explosives by a 3D hyperbranched σ-π Conjugated polymer based on a POSS scaffold

Xiaoshuang Ma, Furong Tao, Yang Zhang, Tianduo Li, Francisco Raymo, Yuezhi Cui

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

A three-dimensional hyperbranched polymer (3D-HP) with σ-π conjugated PDMPS (poly(dichloromethylphenylsilane)s) units covalently bonded to a polyhedral oligosilsesquioxane (POSS) scaffold was prepared by a one-step "thiol-ene click chemistry" reaction. Compared with POSS-based organic polymers, the 3D-HP with a flexible Si-Si chain showed enhanced solubility. This 3D hyperbranched polymer exhibited outstanding thermal stability and optimal photophysical properties. For probing nitroaromatics (NACs), the 3D-HP showed excellent sensitivity (Ksv = 2.83 × 104 M-1) against the presence of a tetrahydrofuran (THF) solution of 2,4,6-trinitrotoluene (TNT). In addition, the 3D-HP coated on glass films exposed to saturated DNT vapor exhibited a high quenching efficiency (ηEP) of the fluorescence of 3D-HP film, which was drastically suppressed (82%) for 300 s. The excellent fluorescent quenching performance of the 3D-HP can be attributed to the following points: (i) hyperbranched conjugated polymers afford multi-dimensional transport pathways for excitons migration; (ii) there exists in the polymer high electron affinity and rapid electron delocalization of σ-π conjugated polysilanes; (iii) noncovalent interactions between the electropositive δ+ Si atoms of σ-π conjugated polysilanes and N and/or O atoms of electron-deficient nitroaromatics (NACs) facilitate the adsorption of NACs. Furthermore, the bulky octathiol-POSS units in the 3D-HP can improve the permeability of the film sensor. This 3D hyperbranched σ-π conjugated polymer 3D-HP has the potential to be used to prepare sensitive, selective, and stable sensors for the detection of NACs explosives.

Original languageEnglish (US)
Pages (from-to)14343-14354
Number of pages12
JournalJournal of Materials Chemistry A
Volume5
Issue number27
DOIs
StatePublished - 2017

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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