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- W1968951780 abstract "The pH-sensing properties of silicon nitride were studied with special emphazise on surface oxidation. Simulations of the surface potential and the sensitivity were performed using the site binding theory to show the influence of an oxygen rich surface and surface oxidation of silicon nitride. Samples were produced by depositing silicon nitride in a LPCVD process with flow ratios of the processing gases NH3 and SiCl2H2 ranging from 2 to 20. The samples were characterized by XPS and capacitance–voltage measurements of EIS-structures. Silicon nitride etched in buffered HF before measurement showed a pH-sensitivity of up to 58 mV pH−1, and an increasing hysteresis was found with increasing NH3/SiCl2H2 gas-flow ratios during deposition. Samples not etched had only a pH-sensitivity between 45 and 52 mV pH−1 because of their oxygen rich surface layer. The oxygen rich layer was found to be approx. 4 nm deep and soluble in buffer electrolyte. Surface oxidation and dissolution of the oxygen rich layer is claimed to be decisive for the pH-sensing properties of silicon nitride." @default.
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- W1968951780 date "1999-09-01" @default.
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- W1968951780 title "The influence of surface oxidation on the pH-sensing properties of silicon nitride" @default.
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- W1968951780 doi "https://doi.org/10.1016/s0925-4005(99)00125-2" @default.
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