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Synthesis, characterization and photoluminescence properties of graphene oxide functionalized with azo molecules

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Abstract

Two different azo molecules functionalized graphene oxide (GO) through an ester linkage have been synthesized for the first time. Chemical structure of the azo-GO hybrids was confirmed by Fourier transform infrared spectroscopy and UV-visible spectroscopy. The GO functionalized with 5-((4-methoxyphenyl)azo)-salicylaldehyde was further characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and atomic force microscopy (AFM). The SEM studies demonstrated that the morphology of the azo-GO hybrid was found to be similar to the GO sheets but slightly more wrinkled. Further, TEM image of azo-GO indicates some dark spots on the GO sheets due to azo functionalization. AFM results also reveal that the azo functionalization increases the thickness of GO sheet to 4–5 nm from 1.2–1.8 nm. Both the azo-hybrids show absorption band around 379 nm due to the π–π* transition of the trans azo units. Photoluminescence spectra of azo-GO hybrids show a strong quenching compared with azo molecules due to the photoinduced electron or energy transfer from the azo chromophore to the GO sheets. It also reveals strong electronic interaction between azo and GO sheets.

Graphene oxide functionalized with two different azo molecules through an ester linkage have been synthesized and characterized. Photoluminescence spectra of azo-GO hybrids show strong quenching compared with azo molecules due to the photo-induced electron or energy transfer from the azo chromophore to the GO sheets.

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Acknowledgements

The authors RY and RD thank the Council of Scientific and Industrial Research (CSIR), (Project No: 01(2256)/08/EMR-II), New Delhi, India for funding and Amrita Vishwa Vidyapeetham for infrastructure.

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Authors and Affiliations

  1. Department of Sciences, Chemistry and Materials Research Laboratory, Amrita Vishwa Vidhyapeetham, Coimbatore, 641 112, India

    R DEVI & R YAMUNA

  2. Department of Chemical Engineering and Material Science, Chemistry and Materials Research Laboratory, Amrita Vishwa Vidhyapeetham, Coimbatore, 641 112, India

    S RAMAKRISHNAN & NIKHIL K KOTHURKAR

  3. Research and Development Centre, Bharathiyar University, Coimbatore, 641 112, India

    G PRABHAVATHI

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  1. R DEVI
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  2. G PRABHAVATHI
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Correspondence to R YAMUNA.

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DEVI, R., PRABHAVATHI, G., YAMUNA, R. et al. Synthesis, characterization and photoluminescence properties of graphene oxide functionalized with azo molecules. J Chem Sci 126, 75–83 (2014). https://doi.org/10.1007/s12039-013-0536-1

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  • DOI: https://doi.org/10.1007/s12039-013-0536-1

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