Portable vapor sensors or ‘sniffers’ have obvious applications in military, industrial, and gas-utility field operations. But conventional sensors lack the resolution and species selectivity of high-end laboratory instrumentation, which can identify and quantify unknowns down to part-per-billion or even part-per-trillion levels in complex mixtures containing hundreds or thousands of volatiles. Although portable devices have become smaller, more energy-efficient, and less costly,1 poor selectivity to individual compounds remains the major barrier for their practical implementation in situations with high levels of interference.
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