Fabrication and Electrical Characterization of Dot Capacitors for Cold Field Emission Applications
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F25%3A00642796" target="_blank" >RIV/68081723:_____/25:00642796 - isvavai.cz</a>
Alternative codes found
RIV/68081731:_____/25:00642796 RIV/00216305:26620/26:0197904
Result on the web
<a href="https://pubs.acs.org/doi/10.1021/acsomega.4c10081" target="_blank" >https://pubs.acs.org/doi/10.1021/acsomega.4c10081</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1021/acsomega.4c10081" target="_blank" >10.1021/acsomega.4c10081</a>
Alternative languages
Result language
angličtina
Original language name
Fabrication and Electrical Characterization of Dot Capacitors for Cold Field Emission Applications
Original language description
The aim of this work was to study the dielectric properties of dot capacitors composed of a microtip coated with a thin layer of epoxy resin bonded to a steel plate. Two microtips with radii ranging from 3 to 5 mu m were fabricated via electrochemical etching and coated with an epoxy layer 27-35 mu m in thickness. The microtips were characterized by scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS). This study showed that composite cold-field emission emitters behave as dot capacitors. The real and imaginary parts of the impedance and permittivity, along with the direct and alternating conductivities, activation energies, and hopping energies, were examined. These evaluations were conducted at temperatures of 30, 45, 60, 75, and 90 degrees C, with a frequency range of 1 to 106 Hz using impedance spectroscopy. The results indicated that both the impedance and electrical permittivity decreased slightly with increasing temperature, whereas the AC conductivity was independent of temperature. Additionally, a decrease in the activation and jump energies was observed as the thickness of the epoxy layer increased. The low values of the activation and hopping energies facilitated electron transport through the epoxy layer. The modified hopping model also provides an explanation for the conduction mechanism through the epoxy layer. The Nyquist plot shows that the capacitance decreased with increasing temperature. A slight increase in relaxation time was also observed, indicating the onset of conductive pathway formation. These findings contribute to a better understanding of the capacitance of the composite emitters and the formation of conductive pathways.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
ACS Omega
ISSN
2470-1343
e-ISSN
2470-1343
Volume of the periodical
10
Issue of the periodical within the volume
11
Country of publishing house
US - UNITED STATES
Number of pages
11
Pages from-to
11108-11118
UT code for WoS article
001445733600001
EID of the result in the Scopus database
2-s2.0-105001082693