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To ensure safety in a simple, quick, and cost-effective manner, the emerging electrical and optomechanical sensors, along with their various sensing strategies, are described and discussed in detail, along with the current state of the art. The nanostructured sensing element plays a crucial role in detecting H2 under various ambient conditions. Hence, the synthesis and deposition of nanostructured materials, including semiconducting metal oxides, metals, conducting polymers, and unique layered\/dimensional structures, are crucial to ensure enhanced gas sensing properties. Finally, some examples of sensing systems applied in real-world scenarios are reviewed, providing the current ground where future developments of electrical and optomechanical systems will play a key role.<\/jats:p>","DOI":"10.5772\/intechopen.1012707","type":"book-chapter","created":{"date-parts":[[2025,10,20]],"date-time":"2025-10-20T11:44:33Z","timestamp":1760960673000},"source":"Crossref","is-referenced-by-count":0,"title":["Electrical and Optomechanical Sensors for Hydrogen Monitoring: Sensing Strategies and Applications"],"prefix":"10.5772","author":[{"given":"Nancy","family":"Anna Anasthasiya Anthuvan","sequence":"first","affiliation":[]},{"given":"Karuppiah","family":"Veerathangam","sequence":"additional","affiliation":[]},{"given":"Jo\u00e3o","family":"Piteira","sequence":"additional","affiliation":[]},{"given":"Hugo","family":"M. 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