Field emission properties of single crystalline W5O14 and W18O49 nanowires

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Field emission properties of single crystalline W5O14 and W18O49 nanowires

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Field emission properties of single crystalline W5O14 and W18O49 nanowires

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

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

Projekt

<a href="/cs/project/TE01020118" target="_blank" >TE01020118: Elektronová mikroskopie</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

Journal of Electron Spectroscopy and Related Phenomena

ISSN

0368-2048

e-ISSN

—

Svazek periodika

241

Číslo periodika v rámci svazku

MAY

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

10

Strana od-do

146837

Kód UT WoS článku

000540723700008

EID výsledku v databázi Scopus

2-s2.0-85064325662