頁籤選單縮合
題 名 | Hydrogen and Methane Gas Sensors Synthesis of Multi-Walled Carbon Nanotubes |
---|---|
作 者 | Samarasekara, P.; | 書刊名 | Chinese Journal of Physics |
卷 期 | 47:3 2009.06[民98.06] |
頁 次 | 頁361-369 |
分類號 | 330 |
關鍵詞 | |
語 文 | 英文(English) |
英文摘要 | The electrical resistance of multi-walled carbon nanotubes increases or decreases in methane (CH₄) or hydrogen (H₂) gas, respectively. The gas sensitivity was measured in a mixture of methane and H₂gases with different partial concentrations for the very first time. The marginal value of the ratio between the methane and H₂gases concentrations in a gas mixture at which the resistance variation changes sign was studied at several measuring temperatures. This marginal value depends on the measuring temperature. The best sensitivity, fastest response, and fastest recovery could be observed at 230 or 300℃ in methane or H₂gas, respectively. These were the highest possible measuring temperatures for each gas, and samples did not indicate stable properties at operating temperatures above 230 or 300℃ for methane or H₂gas, respectively. Furthermore, the change of resistance in the H₂partial concentration of 1.3% in air can be inverted by introducing 2.7% of methane into this mixture of H2/air at 230℃. |
本系統中英文摘要資訊取自各篇刊載內容。