Ultra-selective detection of sub-ppm-level benzene using Pd–SnO 2 yolk–shell micro-reactors with a catalytic Co 3 O 4 overlayer for monitoring air quality

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Ultra-selective and sensitive detection of benzene was achieved using Pd-loaded SnO 2 yolk–shell micro-reactor sensing films coated with a catalytic Co 3 O 4 overlayer.