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


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.


MWCNTs CVD Catalytic growth Optoelectronic humidity sensor 



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.


  1. 1.
    Lijima S (1991) Helical microtubules of graphitic carbon. Nature 354(6348):56–58CrossRefGoogle Scholar
  2. 2.
    Dresselhaus MS (2004) ) Electronic, thermal and mechanical property of carbon nanotubes. Philos Trans R Soc Lond Ser A Math Phys Eng Sci 362(1823):2065–2098CrossRefGoogle Scholar
  3. 3.
    Lu CG, Liu J (2006) Controlling the diameter of carbon nanotubes in chemical vapor deposition method by carbon feeding. J Phys Chem B 110(41):20254–20257CrossRefGoogle Scholar
  4. 4.
    Singh E, Katheria AD, Srivastava R, Kumar U (2016) Recent developments in drug delivery system via nanotechnology. Imp J Interdiscip Res 2(2):2454–1362Google Scholar
  5. 5.
    Singh E, Katheria AD, Kumar U, Srivastava R (2017) Carbon nanotube: A review on introduction, fabrication techniques and optical applications. J Nanosci Nanotechnol Res 4(4):120–126Google Scholar
  6. 6.
    Ming S, Zheng B, Liu J (2000) A scalable CVD method for the synthesis of single-walled carbon nanotubes with high catalyst productivity. Chem Phys Lett 322:321–326CrossRefGoogle Scholar
  7. 7.
    Maruyma S, Kojima R, Miyaunchi Y, Chiashi S, Kohno M (2002) Low-temperature synthesis of high-purity single-walled carbon nanotubes from alcohol. Chem Phys Lett 360:229CrossRefGoogle Scholar
  8. 8.
    Kumar U, Yadav BC (2018) State of art: an approach to the synthesis of pure and doped graphene. Adv Sci Eng Med 10:638–643CrossRefGoogle Scholar
  9. 9.
    O’Connell MJ (2006) Carbon nanotubes: properties and applications. CRC Press, Taylor and Francis Group, Boca RatonCrossRefGoogle Scholar
  10. 10.
    Li HR (2001) Solution polymerization of acrylamide using potassium persulfate as an initiator: kinetic studies, temperature and pH dependence. Eur Polym J 37:1507–1510CrossRefGoogle Scholar
  11. 11.
    Xia L, Li L, Li W, Kou T, Lie D (2013) Novel optical fiber humidity sensor based on a core fibre structure. Sens Actuators A Phys 190:1–5CrossRefGoogle Scholar
  12. 12.
    Kulkarni MV, Apte SK, Naik SD, Ambekar JD, Kale BB (2013) Ink-jet printed conducting polyaniline based flexible humidity sensor. Sens Actuators B Chem 178:140–143CrossRefGoogle Scholar
  13. 13.
    Uddin G, Sajid M, Ali J, Wan S, Hoi Y, Hyun K (2018) Wide range highly sensitive relative humidity sensor based on series combination of MoS2 and PEDOT:PSS sensors array. Sens Actuators B Chem 266:354–363CrossRefGoogle Scholar
  14. 14.
    Yadav BC, Sikarwar S, Bhaduri A, Kumar P (2015) Characterization and development of opto-electronic humidity sensor using copper oxide thin film. Int Adv Res J Sci Eng Technol 2(11):105–109Google Scholar
  15. 15.
    An J, Zhao Y, Jin Y, Shen C (2013) Relative humidity sensor based on sms fiber structure with polyvinyl alcohol coating. Int J Light Electron Opt 124(23):6178–6181CrossRefGoogle Scholar
  16. 16.
    Yuso FAZ, Lim CS, Azzuhri SR, Ahmad H, Zakaria R (2018) Results in physics studies of Ag / TiO2plasmonics structures integrated in side-polished optical fiber used as humidity sensor. Res Phys 10:308–316Google Scholar
  17. 17.
    Singh E, Kumar U, Srivastava R, Yadav BC (2018) Carbon nanotubes based thin films as opto-electronic moisture sensor. Adv Sci Eng Med 10:790–792Google Scholar
  18. 18.
    Kumar U, Yadav BC (2019) Synthesis of carbon nanotubes by direct liquid injection chemical vapor deposition method and its relevance for developing an ultra-sensitive room temperature based CO2 sensor. J Taiwan Inst Chem Eng 96:652–663CrossRefGoogle Scholar
  19. 19.
    Kumar U, Yadav BC (2019) Development of humidity sensor using modified curved MWCNT based thin film with DFT calculations. Sens Actuators B Chem 288:399–407CrossRefGoogle Scholar
  20. 20.
    Kumar U, Sikarwar S, Sonker RK, Yadav BC (2016) Carbon nanotube: synthesis and application in solar cell. J Inorg Organomet Polym 26(6):1231–1242CrossRefGoogle Scholar
  21. 21.
    Dai HJ (2001) Nanotube growth and characterization. Top Appl Phys 80:29–53CrossRefGoogle Scholar
  22. 22.
    Guo X, Small JP, Klare JE, Wang Y, Purewal MS, Tam IW, Hong BH, Caldwell R, Huang L, O’Brien S, Yan J, Breslow R, Wind SJ, Hone J, Kim P, Nuckolls C (2006) Covalently bridging gaps in single-walled carbon nanotubes with conducting molecules. Science 311:356–359CrossRefGoogle Scholar
  23. 23.
    Wang YY, Gupta S, Liang M, Nemanchin RJ (2005) Nemanchin, Increased field-emission site density from regrown carbon nanotube films. J Appl Phys 97:104309CrossRefGoogle Scholar
  24. 24.
    Sveningsson M, Morjan RE, Nerushev O, Campbell EEB (2004) Electron field emission from multi-walled carbon nanotubes. Carbon 42:1165CrossRefGoogle Scholar
  25. 25.
    Wortmann T, Fatikow S (2009) Carbon Nanotube Detection by Scanning Electron Microscopy. MVA2009 IAPR conference on machine vision applications, May 20–22, YokohamaGoogle Scholar
  26. 26.
    Rancea GA, Marsha DH, Nicholasb RJ, Khlobystova AN (2010) UV–vis absorption spectroscopy of carbon nanotubes: Relationship between the π-electron plasmon and nanotube diameter. Chem Phys Lett 493:19–23CrossRefGoogle Scholar
  27. 27.
    Kumar K, Kumar U, Singh M, Yadav BC (2019) Synthesis and characterizations of exohedral functionalized graphene oxide with iron nanoparticles for humidity detection. J Mater Sci Mater Electron 30(14):13013–13023CrossRefGoogle Scholar
  28. 28.
    Božović N, Misewich J, Božović I (2008) Nano-crystallography of individual carbon nanotubes. Nano Lett 8:4477–4482CrossRefGoogle Scholar
  29. 29.
    Nair N, Kim W, Braatz R, Strano M (2008) Dynamics of surfactant-suspended single-walled carbon nanotubes in a centrifugal field. Langmuir 24:1790–1795CrossRefGoogle Scholar
  30. 30.
    Shang H, Liu C, Wei F (2004) FT-IR study of carbon nanotube supported co-mo catalysts. J Nat Gas Chem 13:95–100Google Scholar
  31. 31.
    Sonker RK, Singh M, Kumar U, Yadav BC (2016) MWCNT doped ZnO nano composite thin film as LPG sensing. J Inorg Organomet Polym 26(6):1434–1440CrossRefGoogle Scholar
  32. 32.
    Liu L, Ye X, Wu K, Han R, Zhou Z, Cui T (2009) Humidity sensitivity of multi-walled carbon nanotube networks deposited by dielectrophoresis. Sensors 9:1714–1721CrossRefGoogle Scholar
  33. 33.
    Sikarwar S, Yadav BC (2015) Opto-electronic humidity sensor: A review. Sens Actuators A Phys 233:54–70CrossRefGoogle Scholar

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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