Field emission properties of single crystalline W5O14 and W18O49 nanowires

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081731%3A_____%2F20%3A00524948" target="_blank" >RIV/68081731:_____/20:00524948 - isvavai.cz</a>

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S0368204818301567" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0368204818301567</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.elspec.2019.03.005" target="_blank" >10.1016/j.elspec.2019.03.005</a>

Result language

angličtina

Original language name

Field emission properties of single crystalline W5O14 and W18O49 nanowires

Original language description

Single crystalline tungsten oxides in a form of W 5 O 14 and W 18 O 49 nanowires were synthesized by iodine transport method. The morphology, work functions and field emission properties of these nanowires were investigated. Work functions of the W 5 O 14 (4.20–4.34 eV) and W 18 O 49 (4.55–4.57 eV) nanowires (NWs) have been measured by Kelvin probe force microscopy (KPFM) in ultra-high vacuum. Field emission (FE) measurements of individual nanowires were performed in ultra-high vacuum at microscopic and macroscopic distances between the emitter and electron collector. The obtained FE curves at microscopic distances were analyzed in the framework of the Fowler–Nordheim (F–N) theory. Field enhancement factors of W 5 O 14 at the emitter-collector distance of 2, 4 and 5 μm were calculated to be 110 ± 10, 180 ± 25 and 210 ± 30, respectively, and 125 ± 15 for W18O49 at 2 μm. At macroscopic distances, the F–N theory revealed unrealistic high field enhancement factors: for W 5 O 14 at 1 mm it was 17,000 ± 500, and for W 18 O 49 , the field enhancement factors were 5050 ± 30 and 6450 ± 30 at 600 μm and 800 μm emitter-collector distance, respectively. Therefore, more realistic model was discussed. The lower work function and typically smaller diameter of the W 5 O 14 nanowires in comparison with the W 18 O 49 wires, range the W 5 O 14 nanowires to the promising sources of electrons in field emission devices.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project

<a href="/en/project/TE01020118" target="_blank" >TE01020118: Electron microscopy</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2020

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Electron Spectroscopy and Related Phenomena

ISSN

0368-2048

e-ISSN

—

Volume of the periodical

241

Issue of the periodical within the volume

MAY

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

10

Pages from-to

146837

UT code for WoS article

000540723700008

EID of the result in the Scopus database

2-s2.0-85064325662