A sensing mechanism for the detection of carbon nanotubes using selective photoluminescent probes based on ionic complexes with organic dyes

Light, Science & Applications
Petro LutsykAleksey Rozhin

Abstract

The multifunctional properties of carbon nanotubes (CNTs) make them a powerful platform for unprecedented innovations in a variety of practical applications. As a result of the surging growth of nanotechnology, nanotubes present a potential problem as an environmental pollutant, and as such, an efficient method for their rapid detection must be established. Here, we propose a novel type of ionic sensor complex for detecting CNTs - an organic dye that responds sensitively and selectively to CNTs with a photoluminescent signal. The complexes are formed through Coulomb attractions between dye molecules with uncompensated charges and CNTs covered with an ionic surfactant in water. We demonstrate that the photoluminescent excitation of the dye can be transferred to the nanotubes, resulting in selective and strong amplification (up to a factor of 6) of the light emission from the excitonic levels of CNTs in the near-infrared spectral range, as experimentally observed via excitation-emission photoluminescence (PL) mapping. The chirality of the nanotubes and the type of ionic surfactant used to disperse the nanotubes both strongly affect the amplification; thus, the complexation provides sensing selectivity towards specific CNTs. Addit...Continue Reading

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Citations

Mar 9, 2019·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Alexander A IshchenkoAndrii V Kulinich
Feb 2, 2017·Beilstein Journal of Nanotechnology·Mohammed Al AraimiAleksey Rozhin
Apr 27, 2016·ACS Applied Materials & Interfaces·Yihe ZhangHeping Ma

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