Detail publikace

Tailoring Tungsten Oxide Layers for Cold Field Emission Cathodes: Anodization and Thermal Oxidation Approaches

KOŠELOVÁ, Z. ALLAHAM, M. BURDA, D. POKORNÁ, Z. SOBOLA, D. KNÁPEK, A. FOHLEROVÁ, Z.

Originální název

Tailoring Tungsten Oxide Layers for Cold Field Emission Cathodes: Anodization and Thermal Oxidation Approaches

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

This study explores the optimization of tungsten oxide layers formed via thermal oxidation and anodization for cold field emission applications. Surface modifications can enhance tungsten emitters by improving the emission stability and reducing ion-induced damage. Polycrystalline tungsten samples were treated using two oxidation methods: thermal oxidation (at 550-750 degrees C, 103-104 Pa) and anodization (in 0.33 mol/L H3PO4 at 5-35 V). Lower temperatures and pressures (550 degrees C, 103 Pa) produced smoother (R a similar to 23 nm) and uniform oxide layers (similar to 240 nm thick), improving the high-voltage stability (7.5-8.5 kV). Anodized layers, while less stable at high voltages, exhibited enhanced emission at lower operational voltages (similar to 5.5-7 kV). Field emission microscopy confirmed that thermally oxidized layers perform better under high electrostatic fields, whereas anodized layers offer a rapid response and lower threshold voltages. These findings demonstrate that both oxidation techniques are scalable and tunable for optimizing cold field emitters, with tailored properties suited to specific applications in electron microscopy and related technologies.

Klíčová slova

thermal oxidation; anodization; tungsten oxidethin films; cold field emission; surface engineering; electron microscopy; oxide layer optimization; vacuum technology

Autoři

KOŠELOVÁ, Z.; ALLAHAM, M.; BURDA, D.; POKORNÁ, Z.; SOBOLA, D.; KNÁPEK, A.; FOHLEROVÁ, Z.

Vydáno

18. 4. 2025

Nakladatel

AMER CHEMICAL SOC

Místo

WASHINGTON

ISSN

2637-6113

Periodikum

ACS Applied Electronic Materials

Ročník

6

Číslo

3

Stát

Spojené státy americké

Strany počet

12

URL

https://pubs.acs.org/doi/abs/10.1021/acsaelm.5c00241

BibTex

@article{BUT197815,
  author="Zuzana {Košelová} and Mohammad Mahmoud Mohammad {Allaham} and Daniel {Burda} and Zuzana {Pokorná} and Dinara {Sobola} and Alexandr {Knápek} and Zdenka {Fohlerová}",
  title="Tailoring Tungsten Oxide Layers for Cold Field Emission Cathodes: Anodization and Thermal Oxidation Approaches",
  journal="ACS Applied Electronic Materials",
  year="2025",
  volume="6",
  number="3",
  pages="12",
  doi="10.1021/acsaelm.5c00241",
  issn="2637-6113",
  url="https://pubs.acs.org/doi/abs/10.1021/acsaelm.5c00241"
}