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π–π binding ability of different carbon nano-materials with aromatic phthalocyanine molecules: Comparison between graphene, graphene oxide and carbon nanotubes

Paper ID Volume ID Publish Year Pages File Format Full-Text
27212 44009 2014 6 PDF Available
Title
π–π binding ability of different carbon nano-materials with aromatic phthalocyanine molecules: Comparison between graphene, graphene oxide and carbon nanotubes
Abstract

•The π–π binding of different carbon nanomaterials with phthalocyanine (Pc) was studied.•Strong π–π binding occurred for graphene and graphene oxide but not for SWCNT.•The binding ability with ground state Pc is G ≫ GO ≫ SWCNT.•However, the binding ability with excited state Pc is G ≫ SWCNT ≫ GO.•An effective quenching sphere model is needed for the fluorescence data analysis.

The π–π stacking ability of graphene sheets (GS), graphene oxide (GO), and single walled carbon nanotubes (SWCNT) with phthalocyanine (Pc) molecules was studied by the UV–vis absorption, steady state and time-resolved fluorescence spectra. Absorption spectra revealed that strong π–π binding with the Pc ground state (S0) occurred for GS and GO but not for SWCNT, the binding ability is GS ≫ GO ≫ SWCNT. However, when a Pc molecule is photoexcited, fluorescence study shows that the π–π interaction capability is changed to GS ≫ SWCNT ≫ GO. Although SWCNT exhibits low ability to bind Pc S0 state, it strongly interacts with Pc S1 state. The data analysis shows that the dynamic quenching for the nanoscaled carbon quenchers still obeys linear Stern–Volmer relationship, but the static quenching is not linear. An exponential expression is needed to fit the data for GS and SWCNT, which indicates that an effective quenching sphere model is valid for the nanoscaled fluorescence quenchers.

Keywords
Graphene; Single walled carbon nanotubes; Graphene oxide; Phthalocyanine; Fluorescence; UV–vis absorption; Fluorescence quenching
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π–π binding ability of different carbon nano-materials with aromatic phthalocyanine molecules: Comparison between graphene, graphene oxide and carbon nanotubes
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 278, 15 March 2014, Pages 69–74
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us