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- W3120713346 endingPage "158689" @default.
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- W3120713346 abstract "The sensitivity and stability of sensing film material are mainly factors to impede the practical applications of ion-selective field effect transistor (ISFET) or electrolyte-insulator-semiconductor (EIS) pH sensors. Metal oxide films have demonstrated great advances on achieving high-performance pH sensors. However, some metal oxide films with low sensitivity and poor reliability still hinder the biochemical, environmental and medical applications. Therefore, choosing a proper sensing film material plays a very important role for the fabrication of highly sensitive and reliable sensors. In this article, the novel TbTaxOy sensing membrane demonstrating a super-Nernstian pH response and excellent stabililty was developed for a solid-state pH sensor. We investigated the relationship between sensing performance and microstructural property of the TbTaxOy sensing membranes deposited onto Si substrates through a reactive co-sputtering system and subsequently post-deposition annealing (PDA) at four temperatures (from 600°C to 900°C). To check the influence of PDA treatment on the microstructural properties of the TbTaxOy films, atomic force microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy were employed to manifest the morphological, microstructural, and chemical features, respectively, of these films. Among these PDA temperatures, the TbTaxOy EIS device after annealing at 900 °C exhibited the best sensing performances including, the super-Nernstian sensitivity (67.04 mV/pH), the lowest drift rate (0.12 mV/h), and the smallest hysteresis voltage (1 mV). Probably, this PDA temperature can enhance the surface roughness, form the stoichiometry of TbTaO4 film, and reduce the crystal defects. The super-Nernstian response may be contributed to a variation in the oxidation state of Tb ion changing from Tb3+ to Tb2+, thereby generating two H+ ions and one electron transferred in the chemical reaction. Moreover, this TbTaxOy sensing film demonstrates better sensing performance compared to previously fabricated sensing materials available in the literature." @default.
- W3120713346 created "2021-01-18" @default.
- W3120713346 creator A5023795076 @default.
- W3120713346 creator A5086176183 @default.
- W3120713346 date "2021-05-01" @default.
- W3120713346 modified "2023-10-18" @default.
- W3120713346 title "Microstructural properties and sensitive performance of TbTaxOy sensing membranes for electrolyte-insulator-semiconductor pH sensors" @default.
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- W3120713346 doi "https://doi.org/10.1016/j.jallcom.2021.158689" @default.
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