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Theoretical and Experimental Investigation on SPR Gas Sensor Based on ZnO/Polypyrrole Interface for Ammonia Sensing Applications

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Abstract

This work includes the exploitation of the laboratory-assembled SPR technique for the application of gas sensors at room temperature. The refractive index change at the interface of ZnO/polypyrrole with adsorption of gases (NH3) is the basis of the SPR gas sensor. The theoretical simulations were done to find out the optimum thickness of ZnO and polypyrrole composite films for sharp SPR reflectance values. Theoretical SPR curves obtained by changing the value of the thickness of gold nanoparticle film and incident wavelength are also presented in the manuscript. Experimental studies were done to validate the theoretical studies and discussions were done about the interaction of NH3 gas with prism/Au/ZnO/polypyrrole system. Here, ZnO/polypyrrole multilayer structure is the sensing layer to develop a highly efficient SPR-based NH3 gas sensor. The outcome of these results validates the significance of the SPR technique for the application of interaction of surface adsorbed analytes, with the interface of dielectrics and sensing material.

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Availability of Data and Material

The data sets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

The authors are highly obliged to the late Prof. Vinay Gupta, Department of Physics and Astrophysics, University of Delhi for his kind help and suggestions.

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Authors and Affiliations

  1. Department of Physics, Deshbandhu College, University of Delhi, New Delhi, India

    Ajay Pratap Singh Gahlot & Ayushi Paliwal

  2. Department of Electronic Science, University of Delhi, New Delhi, India

    Ajay Pratap Singh Gahlot & Avinashi Kapoor

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  1. Ajay Pratap Singh Gahlot
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  2. Ayushi Paliwal
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  3. Avinashi Kapoor
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Contributions

Ajay Pratap Singh Gahlot: methodology, editing, and conceptualization; Ayushi Paliwal: methodology, writing–original draft; Avinashi Kapoor: supervision, writing–review and editing.

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Correspondence to Ajay Pratap Singh Gahlot.

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Gahlot, A.P.S., Paliwal, A. & Kapoor, A. Theoretical and Experimental Investigation on SPR Gas Sensor Based on ZnO/Polypyrrole Interface for Ammonia Sensing Applications. Plasmonics 17, 1619–1632 (2022). https://doi.org/10.1007/s11468-022-01648-1

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