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Sub-ppt gas detection with pristine graphene
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See supplementary material at http://dx.doi.org/10.1063/1.4742327
for additional information on device fabrication, electrical conductance measurements, detection limit estimation, gas sensing experiments in a controlled environment, and gas sensing experiments in air. [Supplementary Material]
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Graphene is widely regarded as one of the most promising materials for sensor applications. Here, we demonstrate that a pristine graphene can detect gas molecules at extremely low concentrations with detection limits as low as 158 parts-per-quadrillion (ppq) for a range of gas molecules at room temperature. The unprecedented sensitivity was achieved by applying our recently developed concept of continuous in situcleaning of the sensing material with ultraviolet light. The simplicity of the concept, together with graphene’s flexibility to be used on various platforms, is expected to intrigue more investigations to develop ever more sensitive sensors.
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