Abstract
Abstract The role of flow rate of carrier gas and decomposition temperature in sensing mechanism of pristine single walled carbon nanotubes (SWCNT) with ammonium nitrate vapor has been studied. For this purpose, sensing studies were carried out at 10 sccm, 25 sccm and 50 sccm flow rates. Three decomposer temperatures (70 °C, 170 °C and 230 °C) were taken while varying the bubbler temperature from 70 °C–120 °C. It was found that both flow rates and decomposition temperature play a vital role in affecting the interaction mechanism between SWCNT and ammonium nitrate vapors. Low decomposition temperature favors the ammonia sensing and higher decomposition temperatures (170 °C and 230 °C) lead to dominance of NOx vapors on account of strong decomposition of ammonium nitrate. These trends were observed irrespective of vapor pressure and concentration of ammonium nitrate vapors. This highlights the significant role of flow rate of carrier gas and decomposition temperature in determining the sensing behavior of ammonium nitrate.
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