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Related Experiment Videos

Nanostructured Pt functionlized multiwalled carbon nanotube based hydrogen sensor.

M Krishna Kumar1, S Ramaprabhu

  • 1Alternative Energy Technology, Department of Physics, Indian Institute of Technology Madras, Chennai - 600 036, India.

The Journal of Physical Chemistry. B
|June 15, 2006
PubMed
Summary
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Platinum-functionalized multiwalled carbon nanotubes (MWNTs) show promise as room-temperature hydrogen sensors. These nanostructured materials exhibit reversible resistance changes upon hydrogen exposure, indicating their potential for gas detection applications.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Multi-walled carbon nanotubes (MWNTs) are synthesized using catalytic chemical vapor deposition (CCVD) of acetylene.
  • The synthesis utilizes hydrides of Mm(0.2)Tb(0.8)CO2, produced via hydrogen decrepitation, as catalysts.
  • Functionalization of MWNTs with platinum (Pt) enhances their properties for sensor applications.

Purpose of the Study:

  • To develop and characterize nanostructured platinum-functionalized multi-walled carbon nanotubes (Pt-MWNTs) for hydrogen sensing.
  • To investigate the structural, morphological, and vibrational properties of the synthesized Pt-MWNTs.
  • To evaluate the hydrogen sensing performance of Pt-MWNT ensembles at room temperature.

Main Methods:

  • Synthesis of MWNTs via CCVD using acetylene over Mm(0.2)Tb(0.8)CO2 hydrides.

Related Experiment Videos

  • Purification and chemical treatment of MWNTs followed by Pt functionalization.
  • Characterization using X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), High-Resolution TEM (HRTEM), Raman spectroscopy, Fourier-Transform Infrared (FTIR) spectroscopy, and Energy-Dispersive X-ray (EDX) analysis.
  • Hydrogen sensing measurements by monitoring electrical resistance changes upon gas exposure.

    • Main Results:

    • Successful synthesis and Pt functionalization of MWNTs, confirmed by various characterization techniques.
    • Pt-MWNT thin films demonstrated stability over multiple adsorption-desorption cycles.
    • Reversible and significant changes in electrical resistance were observed upon hydrogen exposure.
    • Pt-MWNTs were identified as p-type semiconductor materials.

    Conclusions:

    • Chemically treated MWNTs functionalized with nanostructured platinum exhibit enhanced room-temperature hydrogen sensing capabilities.
    • The reversible resistance changes indicate the potential of Pt-MWNTs for practical hydrogen gas detection.
    • The p-type semiconductor behavior of Pt-MWNTs is crucial for their sensing mechanism.