Morphological changes of gold nanoparticles due to adsorption onto silicon substrate and oxygen plasma treatment
PBN-AR
Instytucja
Instytut Fizyki Polskiej Akademii Nauk
Informacje podstawowe
Główny język publikacji
en
Czasopismo
RSC Advances
ISSN
2046-2069
EISSN
Wydawca
DOI
URL
Rok publikacji
2014
Numer zeszytu
25
Strony od-do
12729-12736
Numer tomu
4
Identyfikator DOI
Liczba arkuszy
Słowa kluczowe
en
Coalescence mechanisms Deposition of gold nanoparticles Morphological changes Negatively charged Oxygen plasma treatments Silicon substrates Smoluchowski coagulation equation Surface Functionalization Adsorption Deposition Gold Ligands Metal nanoparticles Morphology Plasma applications Oxygen
Streszczenia
Język
en
Treść
Deposition of gold nanoparticles (AuNPs) on a solid substrate followed by oxygen plasma treatment is a commonly used protocol for surface functionalization. Surprisingly, the effect of the deposition process and oxygen plasma on the morphology of the AuNPs is usually overlooked in research. Here, we investigated morphological changes caused by (i) adsorption of small ligand-capped AuNPs (∼5 nm in diameter) onto a silicon substrate and (ii) subsequent oxygen plasma treatment. AuNPs coated with positively and negatively charged as well as uncharged ligands have been investigated. It is found that upon the adsorption the AuNPs undergo plastic deformations and their shapes can be approximated by spherical caps. The degree of the deformation depends strongly on the AuNP coating. During the plasma treatment the AuNPs behave like droplets of a non-wetting liquid, exhibiting the ability to move and merge. We argue that the AuNP coarsening is dominated by the diffusion coalescence mechanism and show that time evolution of the surface AuNP density follows the Smoluchowski coagulation equation. The diffusivity of the AuNP scales with its mass as D(m) ∼ m-α with α = 2.6. This journal is © the Partner Organisations 2014.
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Oryginalny artykuł naukowy
Oryginalny artykuł naukowy przedstawia rezultaty oryginalnych badań naukowych lub eksperymentu.
Original article
Original article presents the results of original research or experiment.
Inne
System-identifier
PBN-R:658931
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