Pseudomorphic growth of Pd monolayer on Au(111) electrode surface

• Published in: Surface science Vol. 461; no. 1; pp. 213 - 218
• Main Authors: Takahasi, M., Hayashi, Y., Mizuki, J., Tamura, K., Kondo, T., Naohara, H., Uosaki, K.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01-08-2000; Amsterdam Elsevier Science; New York, NY
• Subjects: Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Electrochemical methods; Electrodeposition, electroplating; Exact sciences and technology; Gold; Growth; Materials science; Metal–electrolyte interfaces; Methods of deposition of films and coatings; film growth and epitaxy; Palladium; Physics; Structure and morphology; thickness; Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties); Thin film structure and morphology; X-ray scattering, diffraction, and reflection; Gold; Electrochemical methods; Palladium; Metal–electrolyte interfaces; Growth; X-ray scattering, diffraction, and reflection; Adsorption site; Transition elements; Monolayers; Pseudomorphic growth; Electrodeposition; XRD; Experimental study
• ISSN: 0039-6028; 1879-2758
• DOI: 10.1016/S0039-6028(00)00583-5

The surface structure of a Pd layer electrochemically deposited onto Au(111) from
PdCl
2−
4
solution has been studied by surface X-ray diffraction. By combining the measurements of the specular and non-specular rod profiles, both in-plane and out-of-plane structures have been determined. On the Au(111) electrode surface, Pd occupies the cubic closest packing site and forms a pseudomorphic smooth monolayer. The formation of the stable Pd overlayer is explained by the lifting of the surface reconstruction of the Au substrate. The PdAu bond length at the Pd/Au(111) interface has been found to be 2.82
Å, which is close to the sum of the atomic radii of Pd and Au in each bulk.