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Novel pH microsensor based on a thin film gold electrode modified with lead dioxide nanoparticles

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Abstract

A highly sensitive thin-film pH micro-sensor has been fabricated by deposition of lead dioxide (β-PbO2) nanoparticles (NPs) on a planar gold electrode. The resulting pH microchip electrode displays excellent potentiometric response to pH values with a super-Nernstian slope of 84 mVpH−1 over the pH 0.25–13 range. The NPs were electrochemically placed on the planar gold substrate by low current deposition in combination with high voltage oxidation. The merits offered by this elaborated pH microsensor include fast response time, high sensitivity, reasonable selectivity, simple fabrication, long lifetime and the feasibility of miniaturization and integration.

A new thin film pH microsensor, nanoparticles β-PbO2, was elaborated, it revealed excellent potentiometric response characteristics compared to other non-glass pH electrodes. The sensitive layer coat was deposited using low current deposition/high voltage oxidation new approach

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Acknowledgments

Author would like to acknowledge the support of the Ministry of Higher Education, Kingdom of Saudi Arabia for this research through a grant (PCSED-016-12) under the Promising Centre for Sensors and Electronic Devices (PCSED) at Najran University, Kingdom of Saudi Arabia.

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Authors and Affiliations

  1. Pharmacy College, Taif University, 888-Taif, Saudi Arabia, and Hot laboratories Center, Atomic Energy Authority, Cairo, Egypt

    Hassan Arida

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  1. Hassan Arida
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Correspondence to Hassan Arida.

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Arida, H. Novel pH microsensor based on a thin film gold electrode modified with lead dioxide nanoparticles. Microchim Acta 182, 149–156 (2015). https://doi.org/10.1007/s00604-014-1311-9

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  • DOI: https://doi.org/10.1007/s00604-014-1311-9

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