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Aging effects on vertical graphene nanosheets and their thermal stability

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Abstract

The present study investigates environmental aging effects and thermal stability of vertical graphene nanosheets (VGN). Self-organized VGN is synthesized by plasma enhanced chemical vapor deposition and exposed to ambient conditions over 6-month period to examine its aging behavior. A systematic inspection is carried out on morphology, chemical structure, wettability and electrical property by scanning electron microscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, water contact angle and four-probe resistivity measurements at regular intervals, respectively. Detailed microscopic and spectroscopic analysis substantiated the retention of graphitic quality and surface chemistry of VGN over the test period. An unchanged sheet resistance and hydrophobicity reveals its electrical and wetting stability over the time, respectively. Thermogravimetric analysis ensures an excellent thermal stability of VGN up to 575 °C in ambient atmosphere. These findings of long-term morphological, structural, wetting, electrical and thermal stability of VGN validate their potential utilization for the next-generation device applications.

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Acknowledgements

We acknowledge S.K. Dhara for allowing to access Raman spectrometer and A.K. Tyagi for his kind support. We also thankful T.R. Devidas for his careful evaluation and suggestions. S.G. acknowledges Dept. of Atomic Energy, Govt. of India for his Postdoctoral Research Associateship.

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Authors and Affiliations

  1. Surface and Nanoscience Division, Materials Science Group, Indira Gandhi Centre for Atomic Research-Homi Bhabha National Institute, Kalpakkam, 603102, India

    S. Ghosh, S. R. Polaki, P. K. Ajikumar & M. Kamruddin

  2. Corrosion Science and Technology Division, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, India

    N. G. Krishna

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  1. S. Ghosh
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  2. S. R. Polaki
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  3. P. K. Ajikumar
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  4. N. G. Krishna
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  5. M. Kamruddin
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Contributions

S.G. planned, performed the experiments, analyzed the data and wrote the manuscript. P.K.A. did the TGA experiment. N.G.K. performed XPS experiment. All authors discussed the results, commented on the manuscript and gave approval to the final version of the manuscript. S.R.P., P.K.A., N.G.K., and M.K. contributed to the revision of the manuscript.

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Correspondence to S. Ghosh or S. R. Polaki.

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Ghosh, S., Polaki, S.R., Ajikumar, P.K. et al. Aging effects on vertical graphene nanosheets and their thermal stability. Indian J Phys 92, 337–342 (2018). https://doi.org/10.1007/s12648-017-1113-0

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  • DOI: https://doi.org/10.1007/s12648-017-1113-0

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