Recent Advances in Metal Oxides and Metal Oxide Nanocomposites for Chemiresistive Detection of Hazardous Gases

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@article{1720065,
      author = {Ujwalkumar D. Patil, Chetan P. Bhadane, Harshal S. Gavale, Harishchandra B. Patil, Kamlesh B. Deore},
      title = {Recent Advances in Metal Oxides and Metal Oxide Nanocomposites for Chemiresistive Detection of Hazardous Gases},
      journal = {Iconic Research And Engineering Journals},
      year = {2026},
      volume = {10},
      number = {1},
      pages = {2652-2669},
      issn = {2456-8880},
      url = {https://www.irejournals.com/formatedpaper/1720065.pdf},
      abstract = {The rapid and reliable detection of hazardous gases is essential for environmental monitoring, industrial process control, public safety, and healthcare diagnostics. Among various sensing materials, nanostructured metal oxides (MOs) and their nanocomposites have emerged as the most promising candidates for chemiresistive gas sensors owing to their excellent chemical stability, tunable electronic properties, high surface area, and cost-effective fabrication. This mini-review summarizes recent developments in the synthesis, sensing mechanisms, and gas-sensing performance of pristine MOs and MO-based nanocomposites for hazardous gas detection. Various synthesis approaches, including sol-gel, hydrothermal, chemical precipitation, spray pyrolysis, combustion, chemical vapor deposition, and microwave-assisted methods, are critically discussed with respect to their influence on morphology, crystallinity, defect engineering, and sensing characteristics. The review further highlights the fundamental chemiresistive sensing mechanism and key performance parameters such as sensitivity, selectivity, response/recovery time, detection limit, and long-term stability. Recent advances in heterostructures, noble metal decoration, graphene- and polymer-based composites, and hybrid nanomaterials are comprehensively evaluated, demonstrating remarkable improvements in sensing performance through synergistic interfacial interactions and enhanced charge transfer. Finally, current challenges, including high operating temperature, humidity interference, and limited selectivity, are discussed along with future strategies for developing low-power, room-temperature, high-performance chemiresistive gas sensors.},
      keywords = {Metal Oxide Nanostructures, Chemiresistive Gas Sensors, Metal Oxide Nanocomposites, Hazardous Gas Detection, Gas Sensing Mechanism},
      month = {July},
      doi = {https://doi.org/10.64388/IREV10I1-1720065}
  }