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A selective ultrahigh responding high temperature ethanol sensor using TiO2 nanoparticles.

M M Arafat¹, A S M A Haseeb², Sheikh A Akbar³

¹Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia. arafat_mahmood@siswa.um.edu.my.

Sensors (Basel, Switzerland)

|July 30, 2014

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This study investigated titanium dioxide (TiO2) nanoparticles for gas sensing. The developed sensor showed ultrahigh sensitivity to ethanol (C2H5OH) at 600 °C, outperforming hydrogen (H2) and methane (CH4) detection.

Area of Science:

Materials Science
Nanotechnology
Chemical Sensing

Background:

Titanium dioxide (TiO2) nanoparticles are promising materials for gas sensing applications.
Understanding the sensitivity of TiO2 to various gases is crucial for developing effective gas sensors.
Prior heat treatment is essential to maintain the structural integrity of TiO2 nanoparticles during high-temperature sensing tests.

Purpose of the Study:

To investigate the gas sensing properties of TiO2 nanoparticles towards ethanol (C2H5OH), hydrogen (H2), and methane (CH4).
To optimize the operating temperature for enhanced gas sensor performance.
To characterize the morphology and phase content of TiO2 nanoparticles.

Main Methods:

TiO2 nanoparticles were characterized using Field Emission Scanning Electron Microscopy (FESEM), Transmission Electron Microscopy (TEM), and X-ray Diffraction (XRD).

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Gas sensors were fabricated by printing a TiO2 film on a gold interdigitated alumina substrate.

Sensing performance was evaluated at temperatures ranging from 450 °C to 650 °C with varying gas concentrations.

Main Results:

The TiO2 sensor exhibited ultrahigh response to ethanol (C2H5OH) compared to hydrogen (H2) and methane (CH4).
The optimal sensing temperature for ethanol detection was determined to be 600 °C.
At 600 °C, the sensor demonstrated a response time of 3 minutes and a recovery time of 15 minutes for 20 ppm C2H5OH.

Conclusions:

TiO2 nanoparticles demonstrate superior sensitivity to ethanol over other tested gases.
The catalytic action of TiO2 with ethanol is proposed as the mechanism for the ultrahigh sensor response.
The developed TiO2-based gas sensor shows significant potential for selective ethanol detection.