R&D result detail

Original Title

Tantalum-based nanotube arrays via porous-alumina-assisted electrodeposition from ionic liquid: Formation and electrical characterization

English Title

Tantalum-based nanotube arrays via porous-alumina-assisted electrodeposition from ionic liquid: Formation and electrical characterization

Type

WoS Article

Original Abstract

Fabrication of tantalum-based nanotube arrays was accomplished via porous anodic alumina (PAA) assisted electrodeposition (ED). The ED was performed through a PAA template from a conductive bottom face. Mechanically stable, free-standing and spatially-separated TaxOy-nanotubes were electrodeposited potentiostatically at −1.4 V vs. Pt with a high uniformity and population density across the sample surface. The electrolyte employed a room temperature ionic liquid ([BMP]Tf2N) as a solvent. Some impurities in the tantalum pentoxide nanotubes resulted from this selection of solvent. Additionally, some tantalum suboxides with valencies lower than 5 were present. Structural defects, oxygen vacancies and impurities were expected, which might account for the high leakage current of the TaxOy-nanotubes. The nanotubes resistivity was analyzed by the impedance spectroscopy. Based on the magnitude of resistivity and its thermal behavior we could classify the TaxOy material as semiconducting. Development of three-dimensional (3D) tantalum and tantalum oxide nanostructures is of particular interest for potential applications in microelectronic devices with high surface-to-volume ratios, e.g., metal–insulator-metal (MIM) storage capacitors, electrochemical sensors and switching microdevices.

English abstract

Fabrication of tantalum-based nanotube arrays was accomplished via porous anodic alumina (PAA) assisted electrodeposition (ED). The ED was performed through a PAA template from a conductive bottom face. Mechanically stable, free-standing and spatially-separated TaxOy-nanotubes were electrodeposited potentiostatically at −1.4 V vs. Pt with a high uniformity and population density across the sample surface. The electrolyte employed a room temperature ionic liquid ([BMP]Tf2N) as a solvent. Some impurities in the tantalum pentoxide nanotubes resulted from this selection of solvent. Additionally, some tantalum suboxides with valencies lower than 5 were present. Structural defects, oxygen vacancies and impurities were expected, which might account for the high leakage current of the TaxOy-nanotubes. The nanotubes resistivity was analyzed by the impedance spectroscopy. Based on the magnitude of resistivity and its thermal behavior we could classify the TaxOy material as semiconducting. Development of three-dimensional (3D) tantalum and tantalum oxide nanostructures is of particular interest for potential applications in microelectronic devices with high surface-to-volume ratios, e.g., metal–insulator-metal (MIM) storage capacitors, electrochemical sensors and switching microdevices.

Keywords

Electrodeposition, ionic liquid, tantalum oxide, porous anodic alumina, impedance spectroscopy, coulometry

Key words in English

Electrodeposition, ionic liquid, tantalum oxide, porous anodic alumina, impedance spectroscopy, coulometry

Authors

ŠIMŮNKOVÁ, H.; LEDNICKÝ, T.; WHITEHEAD, A.; KALINA, L.; ŠIMŮNEK, P.; HUBÁLEK, J.

RIV year

2022

Released

05.02.2021

Publisher

Elsevier

ISBN

0169-4332

Periodical

APPLIED SURFACE SCIENCE

Volume

548

Number

149264

State

Kingdom of the Netherlands

Pages from

149264

Pages to

149274

Pages count

10

URL

https://www.sciencedirect.com/science/article/pii/S0169433221003408?via%3Dihub

BibTex

@article{BUT171289,
  author="Helena {Šimůnková} and Tomáš {Lednický} and A.H. {Whitehead} and Lukáš {Kalina} and Petr {Šimůnek} and Jaromír {Hubálek}",
  title="Tantalum-based nanotube arrays via porous-alumina-assisted electrodeposition from ionic liquid: Formation and electrical characterization",
  journal="APPLIED SURFACE SCIENCE",
  year="2021",
  volume="548",
  number="149264",
  pages="149264--149274",
  doi="10.1016/j.apsusc.2021.149264",
  issn="0169-4332",
  url="https://www.sciencedirect.com/science/article/pii/S0169433221003408?via%3Dihub"
}