Dear Colleagues,

Many gases found in both industrial and domestic environments, such as H₂, CO, NO, NO₂, CO₂, VOCs, CH₄ and other hydrocarbon gases, as either raw materials or process byproducts, pose a serious health/integrity threat. Hydrogen, in particular, has become a very attractive green energy source in recent years, with the potential to replace conventional fossil-fuel-based generators. Together with CH₄, hydrogen is a colorless, odorless and highly flammable gas, making the development of high-reliability sensing elements and systems a top priority in space, industrial, automotive and smart home applications.

On the other hand, explosive substances like TNT release gaseous molecules that can be detected via very sensitive sensors. The detection of explosive substances is critical for ensuring the safety of crowded environments like large public reunions, airports and subways.

New materials for semiconductor and electrochemical gas sensors, as well as structures (MEMS, nanocomposite films, core-shell nanoparticles, etc.) are constantly being investigated. Their properties, such as responsivity, selectivity, and reliability and detection range, are still being assessed depending on target application.

This Special Issue aims to collect recent contributions in the field of high-risk-gas sensing for the security of equipment and personnel. Points of special interest include wide band-gap semiconductor sensors, materials and coatings for electrochemical sensors, novel sensing element structures, as well as read-out circuits and sensor-signal processing techniques. Works reporting on stand-alone and energy-efficient hazardous-gas-sensing systems for industrial and remote environments are also encouraged.

Dr. Gheorghe Pristavu
Prof. Dr. Gheorghe Brezeanu
Dr. Razvan Pascu
Guest Editors

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• hazardous gases
• gas sensor
• wide band-gap semiconductors
• electrochemical sensors
• sensing element structures
• read-out circuit
• sensing systems
• working environment safety