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Article Dans Une Revue IEEE Journal of Radio Frequency Identification Année : 2021

Porous Titanium Nitride electrodes on miniaturised pH sensor for foetal health monitoring application

Résumé

Measuring pH level on foetal scalp by blood gas analyser is a common practice to prevent the risk of acidosis in monitoring foetal health during labour. However, this current technique of collecting capillary sample is not continuous and has high rate of failures. In this work, a prototype of miniaturized pH sensor based on Titanium Nitride (TiN) electrodes to get continuous measurement of pH targeting foetal health monitoring has been developed. By exploiting wet etching techniques on flat TiN electrodes, porosity of the working surface area has been increased, exhibiting better properties and performances of our pH sensor. Precision of the developed TiN pH sensor is 0.02 in pH, which is close to the requirement of the application. The sensitivity is determined to be 60.24 mV/pH within pH range of interest from 6 to 8. In addition, the potentiostatic electro impedance spectroscopy (PEIS) and cyclic voltammetry (CV) were recorded, showing a 7.7-time smaller impedance at 100 Hz frequency and a better conductivity compared to the flat TiN electrode. This work is under the next step of fabrication to transfer the system from glass onto a flexible Polyimide substrate and to be integrated into a specific miniaturised packaged device for in-vivo testing.
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Dates et versions

hal-04036910 , version 1 (20-03-2023)

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Citer

T. Nguyen, B. Journet, Hakim Takhedmit, Gaelle Bazin Lissorgues. Porous Titanium Nitride electrodes on miniaturised pH sensor for foetal health monitoring application. IEEE Journal of Radio Frequency Identification, 2021, 5 (2), pp.1-4. ⟨10.1109/DTIP56576.2022.9911738⟩. ⟨hal-04036910⟩
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