TAILIEUCHUNG - Báo cáo hóa học: " Annealing of gold nanostructures sputtered on polytetrafluoroethylene"

Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : Annealing of gold nanostructures sputtered on polytetrafluoroethylene | Siegel et al. Nanoscale Research Letters 2011 6 588 http content 6 1 588 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Annealing of gold nanostructures sputtered on polytetrafluoroethylene 1 1 2 3 1 Jakub Siegel Robert Krajcar Zdenka Kolská Vladimir Hnatowicz and Václav Svorcík Abstract Gold nanolayers sputtered on polytetrafluoroethylene PTFE surface and their changes induced by post-deposition annealing at 100 C to 300 C are studied. Changes in surface morphology and roughness are examined by atomic force microscopy electrical sheet resistance by two point technique zeta potential by electrokinetic analysis and chemical composition by X-ray photoelectron spectroscopy XPS in dependence on the gold layer thickness. Transition from discontinuous to continuous gold coverage takes place at the layer thicknesses 10 to 15 nm and this threshold remains practically unchanged after the annealing at the temperatures below 200 C. The annealing at 300 C however leads to significant rearrangement of the gold layer and the transition threshold increases to 70 nm. Significant carbon contamination and the presence of oxidized structures on gold-coated samples are observed in XPS spectra. Gold coating leads to a decrease in the sample surface roughness. Annealing at 300 C of pristine PTFE and gold-coated PTFE results in significant increase of the sample surface roughness. Introduction Up to now many efforts have been spent to produce smart materials with extraordinary properties usable in broad range of technological applications. In the last two decades it has been demonstrated that properties of new prospective materials depend not only on their chemical composition but also on the dimensions of their building blocks which may consist of common materials 1 2 . Besides other interesting properties of nanostructured gold systems such as catalytic effects or magnetism 2 3 which both originate from surface and quantum size .

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