Gold nanolayer and nanocluster coatings induced by heat treatment and evaporation technique

Abstract

The paper is focused on the preparation and surface characterization of gold coatings and nanostructures deposited on glass substrate. Different approaches for the layer preparation were applied. The gold was deposited on the glass with (i) room temperature, (ii) glass heated to 300°C, and (iii) the room temperature-deposited glass which was consequently annealed to 300°C. The sheet resistance and concentration of free carriers were determined by the van der Pauw method. Surface morphology was characterized using an atomic force microscopy. The optical properties of gold nanostructures were measured by UV–vis spectroscopy. The evaporation technique combined with simultaneous heating of the glass leads to change of the sheet resistance, surface roughness, and optical properties of gold nanostructures. The electrically continuous layers are formed for significantly higher thickness (18 nm), if the substrate is heated during evaporation process. The annealing process influences both the structure and optical properties of gold nanostructures. The elevated temperature of glass during evaporation amplifies the peak of plasmon resonance in the structures, the surface morphology being significantly altered.

Effect of roughness on the layer-dependent friction of few-layer graphene

“…The overall decrease in friction with increasing tip radius thus cannot be explained by a decrease in adhesion. On the other hand, AFMbased topographical studies of thermal evaporation of gold on SiO 2 have revealed that gold coating at low thickness values (<20 nm) leads to the formation of globular structures on the surface and therefore, a rough topography when compared with thicker coatings (>30 nm) which have more uniform and smoother distribution of gold over the surface 25 . As a smoother tip surface on the nanometer scale would contribute to a reduction in the overall roughness of the tip-sample interface, we tentatively attribute the observation of decreasing overall friction with increasing tip size in our experiments to this effect.…”

Controlled dewetting as fabrication and patterning strategy for metal nanostructures

“…Table shows that at least a 100 °C temperature annealing is needed to induce the complete dewetting process of thin (10 nm) metal films. Also for ultrathin metal films (<10 nm) thermal processes at temperature higher than the room temperature is needed . This in contrast with, for example, polymeric films on surfaces where the film dewetting process can be observed, in some, cases at room temperature or temperature little higher than the room temperature .…”

“…Spinodal‐like dewetting can be readily observed in ultrathin (<10 nm) liquid films where the height fluctuations can be of very high percentage with respect the film thickness and where the narrow band of wavelengths can easily grow, leading to film rupture . The dewetting process of ultrathin (<10 nm) metal films is particularly interesting both from scientific and technological point of views . From a basic scientific point of view, ultrathin metal films allow to study some physical peculiarities of the dewetting process so as the atom–atom interaction: for an ultrathin metal film on an inert substrate the film thickness‐dependent intermolecular forces consist of a long‐range attractive part, and a short‐range repulsive part .…”

Measurement of Silver Nanolayer Absorption by the Body in an in Vivo Model of Inflammatory Gastrointestinal Diseases

“…In the XRR method, the recorded diffraction peaks are correlated with the thickness of the examined layer. The other often used methods are: scanning force microscopy [8], atomic force microscopy [9] and ellipsometry [10].…”