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Field emission properties of single crystalline W5O14 and W18O49 nanowires
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SYSNO ASEP 0524948 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Field emission properties of single crystalline W5O14 and W18O49 nanowires Author(s) Saqib, M. (SI)
Jelenc, J. (SI)
Pirker, L. (SI)
Škapin, S.D. (SI)
De Pietro, L. (CH)
Ramsperger, U. (CH)
Knápek, Alexandr (UPT-D) RID, ORCID, SAI
Müllerová, Ilona (UPT-D) RID, SAI, ORCID
Remškar, M. (SI)Number of authors 9 Article number 146837 Source Title Journal of Electron Spectroscopy and Related Phenomena. - : Elsevier - ISSN 0368-2048
Roč. 241, MAY (2020)Number of pages 10 s. Publication form Print - P Language eng - English Country NL - Netherlands Keywords nanowires ; tungsten oxides ; electron emitter ; field enhancement factor ; work function Subject RIV JA - Electronics ; Optoelectronics, Electrical Engineering OECD category Condensed matter physics (including formerly solid state physics, supercond.) R&D Projects TE01020118 GA TA ČR - Technology Agency of the Czech Republic (TA ČR) Method of publishing Open access Institutional support UPT-D - RVO:68081731 UT WOS 000540723700008 EID SCOPUS 85064325662 DOI 10.1016/j.elspec.2019.03.005 Annotation 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. Workplace Institute of Scientific Instruments Contact Martina Šillerová, sillerova@ISIBrno.Cz, Tel.: 541 514 178 Year of Publishing 2021 Electronic address https://www.sciencedirect.com/science/article/pii/S0368204818301567
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