Solid-State Gas Sensors with Ni-Based Sensing Materials for Highly Selective Detecting NOx.

Area of Science:

• Materials Science
• Chemical Sensing
• Biomedical Engineering

Background:

• Accurate monitoring of nitrogen oxides (NOx) is vital for inhaled nitric oxide (iNO) therapy in pulmonary arterial hypertension patients.
• Current chemiluminescence sensors used in iNO devices are costly and lack portability.

Purpose of the Study:

• To develop novel solid-state gas sensors for precise NOx monitoring in iNO delivery systems.
• To evaluate the performance and sensing mechanisms of nickel-based materials for NO and NO2 detection.

Main Methods:

• Fabrication of solid-state gas sensors using NiO-SE and (NiFe2O4 + 30 wt.% Fe2O3)-SE materials.
• Testing sensor selectivity, stability, repeatability, and humidity resistance against NO and NO2.
• Investigating sensing mechanisms via adsorption capabilities and electrochemical reactivity assessments.

Main Results:

• The developed Ni-based sensors exhibited high selectivity for NO and NO2, even in the presence of interfering gases.
• Sensors demonstrated excellent stability, repeatability, and resistance to humidity.
• High electrochemical reactivity of NiO and favorable adsorption of NO2 by (NiFe2O4 + 30 wt.% Fe2O3) were identified as key factors for NOx selectivity.

Conclusions:

• Solid-state Ni-based gas sensors offer a promising, cost-effective, and portable alternative for NOx monitoring in iNO therapy.
• These sensors can enhance patient safety and enable innovative advancements in iNO treatment technologies.