S-termination effects for the catalytic activities of Pd on GaN(0001) surfaces

• Published in: Applied surface science Vol. 258; no. 21; pp. 8334 - 8337
• Main Authors: Konishi, T., Ueta, Y., Hirayama, M., Nishiwaki, N., Tsukamoto, S.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 15.08.2012; Elsevier
• Subjects: Binders; Catalysis; Catalyst; Catalytic activity; Catalytic methods; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; GaN; Leaching; Materials science; Methods of nanofabrication; Mizoroki–Heck reaction; Nanoparticles; Palladium; Physics; Solid surfaces and solid-solid interfaces; Stability; Surface chemistry; Surface structure and topography; Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties); 81.16.Hc; S; 81.16.−c; Pd; GaN; 68.35.bj; Mizoroki–Heck reaction; Catalyst; Inorganic compounds; Semiconductor materials; Catalysts; Palladium; Gallium nitride; Nanoparticles; Mizoroki-Heck reaction; 81.16.-c
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2012.03.169

► A new application of S-terminated GaN surface, that is, palladium nanoparticles (PdNP) are deposited on the surface. ► The structure serves as a treatable and green chemical catalyst. ► The catalysts with or without S-termination are prepared to discuss the role of S termination in the fascinating catalytic activity. ► The catalytic activities of the samples are discussed by using the chemical conversions of repeated Mizoroki–Heck reactions. ► It was concluded that the S-termination acts as a stabilizing binder of PdNP on the surface. A S-terminated GaN(0001) substrate covered with catalytically active Pd nanoparticles (PdNP) serves as a treatable and green chemical catalyst for various cross-coupling reactions. The role of S in the formation of PdNP has been studied so far, but the effect on the catalytic activity has not been investigated. In this study, we investigate the role of S-termination during the Mizoroki–Heck reaction from the view point of the stability of PdNP and the yield in repeated reactions. PdNP are formed on both S-terminated GaN(0001) surface and non-terminated one, and their catalytic activities are compared when the quantity of PdNP is subminimal and excessive. It is found that S-termination serves as a binder of PdNP on GaN(0001) surface, resulting in the self-regulation of PdNP leaching.