Photoelectron-spectroscopic and reactivity investigation of thin Pd–Sn films prepared by magnetron sputtering

• Published in: Applied surface science Vol. 253; no. 12; pp. 5400 - 5403
• Main Authors: SKALA, T, VELTRUSKA, K, SEDLACEK, L, MASEK, K, MATOLINOVA, I, MATOLIN, V
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15-04-2007; Elsevier Science
• Subjects: Adsorbed layers and thin films; Alloys; CO oxidation; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Cross-disciplinary physics: materials science; rheology; Deposition by sputtering; Electron and ion emission by liquids and solids; impact phenomena; Exact sciences and technology; Magnetron sputtering; Materials science; Methods of deposition of films and coatings; film growth and epitaxy; Palladium; Photoemission and photoelectron spectra; Physics; Tin; XPS; 33.60.Fy; Magnetron sputtering; 81.05.Bx; CO oxidation; 79.60.Dp; Alloys; Tin; Palladium; XPS; 81.15.Cd; 61.43.Dq; Valence bands; Annealing; Inorganic compounds; Core levels; Film growth; Thin films; 81.15.Cd; 81.05.Bx; 61.43.Dq; 79.60.Dp; 33.60.Fy; Tin alloys; Magnetrons; Cathode sputtering; Quantity ratio; Temperature effects; Palladium alloys; Binding energy; Oxidation; Transition element alloys; X-ray photoelectron spectra; Palladium; Tin; Alloys; XPS; Magnetron sputtering; CO oxidation
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2006.12.017

We have studied Pd–Sn layers with different composition prepared by magnetron sputtering. Layers were sputtered onto Al
2O
3 and SiO
2 substrates and studied by X-ray photoelectron spectroscopy (XPS). Spectra confirmed that after vacuum annealing residual oxygen and carbon have been removed and bimetallic bonds have been created. The shift of Pd 3d
5/2 core level to higher binding energy followed by the peak narrowing in dependence on the composition was observed, accompanied by the shift of the Pd 4d in the valence band region, induced by hybridization of Pd-d and Sn-s,p states. Experiments carried out on a gas-flow reactor indicate increasing temperature of the CO oxidation with tin ratio in the alloy.