Journal
MICROCHIMICA ACTA
Volume 182, Issue 1-2, Pages 149-156Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-014-1311-9
Keywords
Lead dioxide nanoparticles; Thin film microsensor; pH measurements; Silicon-planar gold substrate; Microchips
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Funding
- Ministry of Higher Education, Kingdom of Saudi Arabia through the Promising Centre for Sensors and Electronic Devices (PCSED) at Najran University, Kingdom of Saudi Arabia [PCSED-016-12]
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A highly sensitive thin-film pH micro-sensor has been fabricated by deposition of lead dioxide (beta-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.
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