Journal Articles Sensors and Actuators B: Chemical Year : 2024

A new approach for selective and ultrasensitive ammonia sensors by CuBr encapsulation in a mesoporous thin film for potential metabolic acidosis non-invasive monitoring

Abstract

Ge-rich Ge 2 Sb 2 Te 5 (GGST) is considered as one of the best candidates for industrial phase change memory production. GGST memory cells are generally embedded with Si or Ti nitride layers to prevent oxidation, as it leads to an undesired decrease of the GGST crystallization temperature. Furthermore, GGST films are usually doped with elements such as N, C, O, or Bi, aiming to delay GGST crystallization during the fabrication process as well as during memory cell operation. In this work, ultrahigh vacuum thermal desorption spectroscopy (TDS) was performed during isochronal annealing of a N-doped GGST film covered by a 10 nm-thick TiN x layer. Desorption is observed before GGST crystallization, but the comparison between TDS and in situ x-ray diffraction measurements shows that the main desorption peak, observed between 653 K and 703 K, occurs after GGST full crystallization. The most prominent desorbing species are Ar, N 2 , H 2 , and H. These results show that the TiN x polycrystalline layer cannot prevent N atoms from leaving the GGST layer during annealing, suggesting a progressive change of the N-doped GGST chemical composition during thermal annealing and crystallization.
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Year Month Jours
Avant la publication
Tuesday, April 15, 2025
Embargoed file
Tuesday, April 15, 2025
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Dates and versions

hal-04767714 , version 1 (13-01-2025)

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Lisa Weber, Virginie Martini, Sabrine Smiy, David Grosso, Stephane Burtey, et al.. A new approach for selective and ultrasensitive ammonia sensors by CuBr encapsulation in a mesoporous thin film for potential metabolic acidosis non-invasive monitoring. Sensors and Actuators B: Chemical, 2024, 417 (28), pp.136124. ⟨10.1016/j.snb.2024.136124⟩. ⟨hal-04767714⟩
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