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UID:227@w3.insp.upmc.fr
DTSTART;TZID=Europe/Paris:20260709T163000
DTEND;TZID=Europe/Paris:20260709T163000
DTSTAMP:20260701T132641Z
URL:https://w3.insp.upmc.fr/events/seminaire-seminar-aleksandra-baron-wiec
 hec-tracing-oxygen-and-hydrogen-in-thin-films-by-ion-beam-accelerator-base
 d-methods-09-07-26/
SUMMARY:Séminaire/Seminar - Aleksandra Baron-Wiecheć - Tracing oxygen and
  hydrogen in thin films by ion beam accelerator based methods - 09/07/26
DESCRIPTION:[wp-svg-icons icon="location" wrap="I"] 22-23 317\nAleksandra B
 aron-Wiecheć - Guangdong Technion – Israel Institute of Technology\, Ch
 ina\n\nThe functional properties of thin anodic oxide films are closely li
 nked to strategic research topics such as nanoscale ferromagnetism in semi
 conductors\, aqueous proton-ion batteries\, and wearable electronics. Unde
 r specific anodization conditions\, it is possible to form regular arrays 
 of nanometric pores with varied morphology and properties\, including diel
 ectric\, optical\, or hydrophobic characteristics. However\, due to the co
 mplexity and overlapping phenomena involved in the formation of self-regul
 ated pores within the primary barrier-type oxide film\, the underlying mec
 hanisms remain a subject of considerable debate.\nThis presentation aims t
 o clarify certain aspects of the theories regarding the initiation and gro
 wth of anodic films through the use of isotopic labelling. The oxygen isot
 ope ¹⁸O was employed to trace oxygen ion movements during the formation
  of porosity in amorphous films produced by anodization in an acidic envir
 onment. By combining particle accelerator-based techniques\, namely ion-in
 duced nuclear reactions (Nuclear Reaction Analysis\, NRA) and ion scatteri
 ng (Rutherford Backscattering Spectrometry\, RBS)\, significant difference
 s were observed in the formation of embryo pores\, oxygen migration\, and 
 electrolyte ion incorporation during anodization under similar galvanostat
 ic parameters.\nIt is highly probable that a peculiar space charge distrib
 ution\, arising from the presence of hydrogen and other doping ions from t
 he electrolyte\, exerts a dual effect: it retards the ejection of Al³⁺ 
 ions while also hindering the inward migration of O²⁻ ions\, despite th
 e presence of a strong electric field during anodization. Nevertheless\, t
 he presence of hydrogen in anodic films and its role in the growth mechani
 sm remain unconfirmed and largely unexplored\, despite their potential sig
 nificance. Consequently\, the final part of the talk will introduce a new 
 research line currently being established at the SAFIR platform\, specific
 ally Elastic Recoil Detection Analysis (ERDA)\, which promises to be an in
 valuable tool for the qualitative and quantitative assessment of hydrogen 
 in thin films\, extending beyond anodic oxides.
ATTACH;FMTTYPE=image/jpeg:https://w3.insp.upmc.fr/wp-content/uploads/2024/
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CATEGORIES:Séminaires/Seminars
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