Assemblies of Gold Nanoparticles at Liquid-Liquid Interfaces by Evgeny Smirnov

Author:Evgeny Smirnov
Language: eng
Format: epub, pdf
Publisher: Springer International Publishing, Cham

4.2.3 Monitoring the Morphology of the Interfacial Gold Nanofilms with Increasing by Scanning Electron Microscopy (SEM)

The interpretation of the extinction and reflectance spectra for interfacial nanofilms formed with 38 nm Ø (Fig. 4.1) and 12 nm Ø (Fig. 4.2) AuNPs was dependent on the existence of three distinct morphological regimes of the AuNPs at the interface, each of which scattered light to varying degrees, as a function of .

To confirm their existence, we transferred interfacial gold nanofilms formed in a stepwise manner with 38 nm Ø AuNPs at a series of conditions (from 0.1 to 2.0 ML) to silicon substrates and obtained SEM images of each (Fig. 4.3). Obviously, transfer and drying of nanofilms on silicon substrates may cause deviation in particles position. To avoid misinterpreting of the obtained SEM data, we also carried out in situ optical microscopy.

Fig. 4.3Micro- and nanoscale mechanisms of decreasing reflectance caused by morphological changes. Comparison of in situ optical microscopy images (50 × magnification) and ex situ SEM images of the interfacial gold nanofilms transferred to a silicon substrate. The coverages of the interface () in monolayer are as follows: a 0.1 ML, b 0.2 ML, c 0.4 ML, d 0.6 ML, e 0.8 ML, f 1.0 ML, and g 2.0 ML. Scales bars are from left to right 10 µm, 400 nm, and 200 nm.

Reproduced from Ref. [53] with permission from The Royal Society of Chemistry

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