Edge-on and face-on functionalized Pc on enriched semiconducting SWCNT hybrids

Nanoscale
Luis M ArellanoFernando Langa

Abstract

Enriched semiconducting single-walled carbon nanotubes (SWCNT (6,5) and SWCNT (7,6)) and HiPco nanotubes were covalently functionalized with either zinc phthalocyanine or silicon phthalocyanine as electron donors. The synthetic strategy resulted in edge-on and face-on geometries with respect to the phthalocyanine geometry, with both phthalocyanines held by an electronically conducting diphenylacetylene linker. The extent of functionalization in the MPc-SWCNT (M = Zn or Si) donor-acceptor nanohybrids was determined by systematic studies involving AFM, TGA, XPS, optical and Raman techniques. Intramolecular interactions in MPc-SWCNT nanohybrids were probed by studies involving optical absorbance, Raman, luminescence and electrochemical studies. Different degrees of interactions were observed depending on the type of MPc and mode of attachment. Substantial quenching of MPc fluorescence in these hybrids was observed from steady-state and three-dimensional fluorescence mapping, which suggests the occurrence of excited state events. Evidence for the occurrence of excited state charge transfer type interactions was subsequently secured from femtosecond transient absorption studies covering both the visible and near-infrared regions. Fu...Continue Reading

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Citations

May 9, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Kelly A D F CastroMário M Q Simões
Aug 3, 2019·Nanoscale·Myriam BarrejónFernando Langa
Dec 14, 2018·Chemical Science·Myriam BarrejónFernando Langa

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Methods Mentioned

BETA
imaging techniques
atomic force microscopy

Software Mentioned

CoMoCAT
HyperChem

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