Gold nanoparticle assembly on porous silicon by pulsed laser induced dewetting.
| Autor: | Fulton AJ; Department of Chemistry, University of Calgary Calgary AB T2N 1N4 Canada shiy@ucalgary.ca +1-403-2108674., Ozhukil Kollath V; Department of Chemical and Petroleum Engineering, University of Calgary Calgary AB T2N 1N4 Canada., Karan K; Department of Chemical and Petroleum Engineering, University of Calgary Calgary AB T2N 1N4 Canada., Shi Y; Department of Chemistry, University of Calgary Calgary AB T2N 1N4 Canada shiy@ucalgary.ca +1-403-2108674. |
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| Jazyk: | angličtina |
| Zdroj: | Nanoscale advances [Nanoscale Adv] 2020 Jan 31; Vol. 2 (2), pp. 896-905. Date of Electronic Publication: 2020 Jan 31 (Print Publication: 2020). |
| DOI: | 10.1039/d0na00043d |
| Abstrakt: | This work reports the influence of the substrate in the pulsed laser-induced dewetting (PLiD) of Au thin films for the fabrication of nanoparticle (NP) arrays. Two substrates were studied, i.e. , polished silicon and porous silicon (PS), the latter being fabricated via electrochemical anodization in HF-containing electrolytes. The effect of both PLiD and substrate preparation parameters was explored systematically. On polished silicon substrates, it has been shown that uniform, randomly arranged NPs between 15 ± 7 nm and 89 ± 19 nm in diameter are produced, depending on initial thin film thickness. On PS however, there are topographical features that lead to the formation of ordered NPs with their diameters being controllable through laser irradiation time. The presence of surface pores and the appearance of surface ripples under low HF concentrations (<9.4 wt%) during electrochemical anodization results in this unique dewetting behaviour. Through AFM analysis, it has been determined that the ordered NPs sit within the valleys of the ripples, and form due to the atomic mobility enabled using the PLiD approach. This work has demonstrated that the utilization of topographically complex PS substrates results in size controllable and ordered NPs, while the use of polished Si does not enable such control over array fabrication. Competing Interests: There are no conflicts to declare. (This journal is © The Royal Society of Chemistry.) |
| Databáze: | MEDLINE |
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