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Selective detection of the inorganics NOx, SO2, and H2S in the presence of volatile BTEX contaminants toluene, benzene, and xylene

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Abstract

We demonstrate the highly selective detection of the inorganics NOx (NO, NO2), SO2, and H2S in the presence of toluene, benzene, and xylene using nanostructure metal-oxide-decorated interfaces. This selectivity can be obtained for sensors whose sensitivities are varied for a diversity of nanostructured metal oxides which are applied to a porous silicon (PS) interface. We focus on NOx and SO2 and include additional new evaluations for the response to H2S. In all cases, the response to these inorganic analytes strongly dominates that for toluene, benzene, and xylene. The responses are also consistent with the recently developing inverse hard/soft acid/base concept. The nanostructure metal-oxide-decorated PS conductometric sensors are found to have selectivity ratios well in excess of 104:1 for toluene and benzene and well in excess of 103:1 for xylene. The dominance of the response of these small inorganic sulfur and nitrogen compounds has important implications for the monitoring of significant contaminants associated with the venting and flaring of natural gas pits, as they can be present in oil and gas formations.

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Acknowledgments

We acknowledge the help of William Laminack in the collection of data for this paper.

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The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. School of Physics, Georgia Institute of Technology, 837 State Street, Atlanta, GA, 30332-0430, USA

    Caitlin Baker & James L. Gole

  2. School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA

    James L. Gole

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  1. Caitlin Baker
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  2. James L. Gole
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Correspondence to James L. Gole.

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Baker, C., Gole, J.L. Selective detection of the inorganics NOx, SO2, and H2S in the presence of volatile BTEX contaminants toluene, benzene, and xylene. Air Qual Atmos Health 9, 411–419 (2016). https://doi.org/10.1007/s11869-015-0350-7

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  • DOI: https://doi.org/10.1007/s11869-015-0350-7

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