PROJECT TITLE :

Fabrication of a Glow Discharge Plasma-Based Ionization Gas Sensor Using Multiwalled Carbon Nanotubes for Specific Detection of Hydrogen at Parts Per Billion Levels

ABSTRACT:

A brand new glow discharge plasma-primarily based sensor is fabricated for specific detection of hydrogen (H2) at elements per billion levels based on gas ionization process below vacuum condition (~0.01 Torr). The system setup consists of a two-electrode system including graphite electrode (diameter: 6.5 mm), modified with arc-synthesized carbon nanostructures as anode and an aluminum disk with 2.4-mm diameter as cathode with interelectrodes distance of 700 ± ten μm inside a glass chamber. For H2 detection, ionization current is taken into account as detection system, during the application of an 853 V direct current potential as a fingerprint breakdown voltage for H2 ionization to the electrodes. In keeping with the results, the sensor is linear ranging from 40 to 86 ppb. The relative normal deviation of 9 replicate analyses during the introduction of ~60 ppb of H2 is 2.fifty sevenpercent. In addition, the detection limit is evaluated to ~3.3 ppb. No interfering result is observed when introducing at least one thousand-fold excess (mass/mass) of foreign species, like Ar, He, CO2, CO, C2H2, O2 acetone, and CH3OH to ~60 ppb of H2 commonplace resolution. Reliability of the sensor is also evaluated via determination of H2 in two industrial gas samples.


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