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Open Access Nano Express

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

Anna Schaub1, Petr Slepička1*, Irena Kašpárková1, Petr Malinský23, Anna Macková23 and Václav Švorčík1

Author Affiliations

1 Department of Solid State Engineering, Institute of Chemical Technology, Prague 166 28, Czech Republic

2 Nuclear Physics Institute, Academy of Sciences of the Czech Republic, Rez, Czech Republic

3 Faculty of Science, J.E. Purkyně University, Ústí nad Labem, Czech Republic

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Nanoscale Research Letters 2013, 8:249  doi:10.1186/1556-276X-8-249

Published: 22 May 2013

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.

Keywords:
Glass substrate; Gold coating; Nanostructure; Surface properties; Thermal annealing