Morphological changes of gold nanoparticles due to adsorption onto silicon substrate and oxygen plasma treatment
PBN-AR
Instytucja
Wydział Chemii (Uniwersytet Warszawski)
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.
Cechy publikacji
ORIGINAL_ARTICLE
Inne
System-identifier
658931
CrossrefMetadata from Crossref logo
Cytowania
Liczba prac cytujących tę pracę
Brak danych
Referencje
Liczba prac cytowanych przez tę pracę
Brak danych