Details

Autor(en) / Beteiligte

• Ridhi, R.
• Chouksey, Abhilasha
• Gautam, Seema
• Rawat, J.S.
• Jha, Pika

Titel

Study of the effect of flow rate and decomposition temperature on sensing of ammonium nitrate by carbon nanotubes

Ist Teil von

• Sensors and actuators. B, Chemical, 2021-05, Vol.334, p.129658, Article 129658

Ort / Verlag

Lausanne: Elsevier B.V

Erscheinungsjahr

2021

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Ammonium nitrate, NH4NO3 (AN) decomposition studies are analyzed using Single Walled carbon nanotube (SWCNT) chemresistor. The vaporized AN vapors are passed towards decomposer through carrier gas. Decomposer temperatures are fixed at 70 °C, 170 °C and 230 °C for fixed flow rates of carrier gases 10 sccm, 25 sccm and 50 sccm. For these fixed parameters, bubbler (vaporizer) temperatures are varied (70 °C–120 °C) and passed through decomposer. The decomposed vapors are sensed by SWCNT chemresistor and its varying trends of resistances are utilized for analyzing thermal decomposition phenomena. [Display omitted] •Thermal decomposition studies of ammonium nitrate (AN) using carbon nanotube sensor are carried.•Effect of flow rate of carrier gas, vaporization and decomposition temperature of AN are analyzed.•The various reaction mechanisms undertaking are observed experimentally using chemresistor.•Sensing results are confirmed using raman spectroscopy and Field emission scanning electron microscopy.•Effect of relative humidity and dry air on the sensor in studying AN decomposition mechanism is also discussed. 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.