Which mechanism allows buckypaper modified with palladium nanoparticles to detect hydrogen gas at room temperature?

💡 Explanation

When hydrogen gas contacts palladium nanoparticles on buckypaper, adsorbed hydrogen atoms cause a measurable change in electrical resistance because the hydrogen interacts with the palladium's electronic structure, affecting conductivity. Therefore resistance change allows detection, rather than photoelectric emission, ferromagnetic transition, or triboelectric generation, which involve different phenomena.

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