Annealing of sputtered gold nano-structures |
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Authors: | V ?vor?ík O Kvítek O Lyutakov J Siegel and Z Kolská |
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Institution: | (1) Department of Solid State Engineering, Institute of Chemical Technology, Technicka 5, 166 28 Prague, Czech Republic;(2) Department of Chemistry, J.E. Purkyně University, Cesk? ml?deze 8, 400 96 Usti nad Labem, Czech Republic |
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Abstract: | Abstract The effects of annealing on gold structures sputtered onto glass substrate were studied using AFM, UV-Vis methods
and electrical measurements. The colour of the as-deposited films changes from blue to green with increasing deposition time.
After 1 hour annealing at 300°C the structures acquire red colour regardless of the film thickness. The annealing results
in dramatic changes of surface morphology and roughness and creation of relatively large “spherolytic and hummock-like” structures
in the gold layer. For deposited structures a non-zero optical band gap EgoptE_{\mathrm{g}}^{\mathrm{opt}} was determined from UV-Vis spectra using Tauc’s model and it indicates a semi-conducting character of the structures. The
annealing leads to an increase of the band gap. Electrical resistance of the deposited unannealed structures decreases dramatically
for deposition times above 50 s. For annealed structures the resistance fall comes until after 250 s deposition time. |
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