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Catalytic growth of MWCNT using CVD and its application as opto-electronic humidity sensor

  • Ekta Singh
  • Utkarsh Kumar
  • Richa Srivastava
  • B. C. YadavEmail author
Original Article

Abstract

The present paper describes the effect of co-catalyst on the growth of multiwall carbon nanotube (MWCNT) by chemical vapor deposition (CVD) technique. The fascinating properties of CNT make them a suitable material for optoelectronic devices such as sensors, LED, solar cell, and field emission displays. MWCNTs were fabricated using CVD, by decomposing ethanol over finely dispersed Co metal as a catalyst at 750 °C. The effects of growth condition on the quality and morphology of MWCNTs were investigated by SEM, FTIR and XRD. SEM photographs show that the nanotubes are densely packed having a diameter of 10–15 nm. The bandgap was calculated by UV–visible spectroscopy and it was found varying from 3.08 to 3.5 eV by changing the substrates. The average size of tubes (length) was found to be 250 nm. FTIR exhibited that the synthesized MWCNTs were semiconducting in nature with the oxygen vacancies causing the variations in refractive index with the exposure of moisture.

Keywords

MWCNTs CVD Catalytic growth Optoelectronic humidity sensor 

Notes

Acknowledgements

The authors gratefully acknowledge Babasaheb Bhimrao Ambedkar University, Lucknow, U.P., India.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Korean Carbon Society 2019

Authors and Affiliations

  • Ekta Singh
    • 1
  • Utkarsh Kumar
    • 1
  • Richa Srivastava
    • 1
  • B. C. Yadav
    • 1
    Email author
  1. 1.Nanomaterials and Sensors Research Laboratory, Department of PhysicsBabasaheb Bhimrao Ambedkar UniversityLucknowIndia

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