Nanoscale gaps, which enable many research applications in fields such as chemical sensors, single-electron transistors, and molecular switching devices, have been extensively investigated over the past decade and have witnessed the evolution of related technologies. Importantly, nanoscale gaps employed in hydrogen-gas (H2) sensors have been used to reversibly detect H2 in an On–Off manner, and function as platforms for enhancing sensing performance. Herein, we review recent advances in nanogap design for H2 sensors and deal with various strategies to create these gaps, including fracture generation by H2 exposure, deposition onto prestructured patterns, island formation on a surface, artificial manipulation methods, methods using hybrid materials, and recent approaches using elastomeric substrates. Furthermore, this review discusses a new nanogap design that advances sensing capabilities in order to meet the diverse needs of academia and industry.
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