Publication detail

Formation and gas-sensing properties of a porous-alumina-assisted 3-D niobium-oxide nanofilm

MOZALEV, A. BENDOVÁ, M. VAZQUEZ, R. PYTLÍČEK, Z. LLOBET, E. HUBÁLEK, J.

Original Title

Formation and gas-sensing properties of a porous-alumina-assisted 3-D niobium-oxide nanofilm

Type

journal article in Web of Science

Language

English

Original Abstract

For advanced gas-sensing applications, we have synthesized a 3-dimensional (3-D) metal/oxide/metal nanofilm that merges the benefits of advanced composite inorganic materials with the flexibility of non-lithographic electrochemical technologies based on so-called porous-anodic-alumina-assisted anodizing of a refractory metal and the original point electrodeposition of noble metals. The film is composed of an NbO2 layer, 200 nm thick, with upright-standing Nb2O5 nanocolumns (diameter ∼50 nm, length 900 nm, density 8 × 109 cm−2), which work as semiconducting nano-channels, assembled between two parallel metal electrodes, whose resistivity measured along the columns is greatly impacted by the surface and interface reactions. A laboratory microdevice employing the 3-D niobium-oxide nanofilm, mounted on a standard TO-8 package, revealed asymmetric electron transfer properties due to a Schottky barrier formed at the Au/Nb2O5 interface, resistive switching mechanism in the film, and superior characteristics for hydrogen and, especially, ethanol detection with best response times to 1000 ppm H2 and 500 ppm H2C6O being 3 and 1 min, respectively. A computer-aided simulation of gas diffusion in the 3-D nanofilm predicts a possibility to substantially improve sensor performance through the formation of a perforated top electrode and by introducing certain innovations in the electrode design.

Keywords

Niobium oxide; Anodizing; Anodic alumina; 3-D nanostructure; Hydrogen; Ethanol; Gas sensor

Authors

MOZALEV, A.; BENDOVÁ, M.; VAZQUEZ, R.; PYTLÍČEK, Z.; LLOBET, E.; HUBÁLEK, J.

Released

28. 6. 2016

ISBN

0925-4005

Periodical

Sensors and Actuators B: Chemical

Number

229

State

Swiss Confederation

Pages from

587

Pages to

598

Pages count

12

URL

http://www.sciencedirect.com/science/article/pii/S0925400516301733

BibTex

@article{BUT122551,
  author="Zdeněk {Pytlíček} and Alexander {Mozalev} and Mária {Bendová} and Rosa Maria {Vazquez} and Eduard {Llobet} and Jaromír {Hubálek}",
  title="Formation and gas-sensing properties of a porous-alumina-assisted 3-D niobium-oxide nanofilm",
  journal="Sensors and Actuators B: Chemical",
  year="2016",
  number="229",
  pages="587--598",
  doi="10.1016/j.snb.2016.02.024",
  issn="0925-4005",
  url="http://www.sciencedirect.com/science/article/pii/S0925400516301733"
}