Abstract
A Cu-TiN composite powder was synthesized by ball milling a Ti 2Cu alloy for 25 h in an N2 pressurized atmosphere for use in CuO-TiN and CuO-TiO2 p-type sensing materials. The sensing materials were prepared via a two-step oxidizing process following an investigation of their CO gas-sensing properties. The resistances of both sensing materials increased as CO was introduced, which is typical for a p-type semiconductor at temperature higher than 200 °C. It was found that the CuO-TiN powder shows a better response above 200 °C when compared to the CuO-TiO2 powder. The highest response shown by CuO-TiN was 3.18, while CuO-TiO2 shows a response of 2.20 for 1000 ppm of CO gas at 250 °C. It is believed that the lower responses of CuO-TiO2 at temperature higher than 200 °C was due to the falloff of p-type resistances by simultaneous operation of p- and n-type semiconductors in the presence of CO gas.
| Original language | English |
|---|---|
| Pages (from-to) | 323-328 |
| Number of pages | 6 |
| Journal | Metals and Materials International |
| Volume | 20 |
| Issue number | 2 |
| DOIs | |
| State | Published - 2014.03 |
Keywords
- composites
- CuO-TiN sensor material
- mechanical alloying/milling
- nanostructured materials
- p-type semiconductor
Quacquarelli Symonds(QS) Subject Topics
- Engineering - Mechanical
- Materials Science
- Physics & Astronomy
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