Temperature-Driven Morphological and Microstructural Changes of Gold Nanoparticles Prepared by Aggregation from the Gas Phase
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F25%3A10503797" target="_blank" >RIV/00216208:11320/25:10503797 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=gbLi62Q48Z" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=gbLi62Q48Z</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1021/acsomega.5c02149" target="_blank" >10.1021/acsomega.5c02149</a>
Alternative languages
Result language
angličtina
Original language name
Temperature-Driven Morphological and Microstructural Changes of Gold Nanoparticles Prepared by Aggregation from the Gas Phase
Original language description
The effect of annealing on the thin layers of gold and gold nanoparticles in air was studied by statistically relevant X-ray scattering methods. The nanoparticle behavior is found to depend on the substrate coverage and annealing temperature. During annealing up to 450 degrees C, the size of single-crystalline nanoparticles gradually increases through the process of Ostwald ripening, while the density of crystallographic defects decreases slightly. An abrupt change occurs above 450 degrees C, whereas no significant evolution is observed for the less covered sample; at the sample with more material, the nanoparticles coalesce, and their shape becomes more rounded by further annealing. Only after the spheroidization is completed do the sizes of crystallites follow the nanoparticle size growth. Comparison with the thin continuous gold layer shows that the healing of the crystallographic defects, i.e., microstrain and stacking faults, takes place at significantly lower temperatures if the material is evenly distributed on the silicon substrate surface. However, annealed nanoparticle layers provide a much narrower particle size distribution when compared to a dewetted gold thin layer. At around 800 degrees C, the alignment of the gold crystal structure toward the substrate is detected, and it changes from the random distribution of the atomic planes given by the random initial orientation of deposited nanoparticles. Another interesting phenomenon occurs for annealing above 1000 degrees C; for the nanoparticle layers, the smallest nanoparticles evaporate, leaving holes in the SiO2 surface layer.
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
10301 - Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)
Result continuities
Project
<a href="/en/project/GA22-16667S" target="_blank" >GA22-16667S: Synthesis of metal oxide-based nanomaterials for surface-enhanced Raman spectroscopy by plasma-based gas aggregation sources</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
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
21
Country of publishing house
US - UNITED STATES
Number of pages
10
Pages from-to
22052-22061
UT code for WoS article
001493038100001
EID of the result in the Scopus database
2-s2.0-105005521292