Temperature-Driven Morphological and Microstructural Changes of Gold Nanoparticles Prepared by Aggregation from the Gas Phase

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Temperature-Driven Morphological and Microstructural Changes of Gold Nanoparticles Prepared by Aggregation from the Gas Phase

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Temperature-Driven Morphological and Microstructural Changes of Gold Nanoparticles Prepared by Aggregation from the Gas Phase

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10301 - Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)

Projekt

<a href="/cs/project/GA22-16667S" target="_blank" >GA22-16667S: Syntéza nanomateriálů na bázi oxidů kovů pro povrchem zesílenou Ramanovu spektroskopii pomocí plazmových plynně agregačních zdrojů</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

ACS Omega

ISSN

2470-1343

e-ISSN

2470-1343

Svazek periodika

10

Číslo periodika v rámci svazku

21

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

10

Strana od-do

22052-22061

Kód UT WoS článku

001493038100001

EID výsledku v databázi Scopus

2-s2.0-105005521292